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VideoWriter.html

VideoWriter.html 36 KB
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  104. <div class="subTitle">org.opencv.videoio</div>
    105. 

  105. <h2 title="Class VideoWriter" class="title">Class VideoWriter</h2>
    106. 

  106. </div>
    107. 

  107. <div class="contentContainer">
    108. 

  108. <ul class="inheritance">
    109. 

  109. <li>java.lang.Object</li>
    110. 

  110. <li>
    111. 

  111. <ul class="inheritance">
    112. 

  112. <li>org.opencv.videoio.VideoWriter</li>
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    121. 

  121. <pre>public class <span class="typeNameLabel">VideoWriter</span>
    122. 

  122. extends java.lang.Object</pre>
    123. 

  123. <div class="block">Video writer class.
    124. 

  124. 

  125.  The class provides C++ API for writing video files or image sequences.</div>
    126. 

  126. </li>
    127. 

  127. </ul>
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  137. <h3>Constructor Summary</h3>
    138. 

  138. <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
    139. 

  139. <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
    140. 

  140. <tr>
    141. 

  141. <th class="colOne" scope="col">Constructor and Description</th>
    142. 

  142. </tr>
    143. 

  143. <tr class="altColor">
    144. 

  144. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter--">VideoWriter</a></span>()</code>
    145. 

  145. <div class="block">Default constructors
    146. 

  146. 

  147.      The constructors/functions initialize video writers.</div>
    148. 

  148. </td>
    149. 

  149. </tr>
    150. 

  150. <tr class="rowColor">
    151. 

  151. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-double-org.opencv.core.Size-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    152. 

  152.            int&nbsp;fourcc,
    153. 

  153.            double&nbsp;fps,
    154. 

  154.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</code>&nbsp;</td>
    155. 

  155. </tr>
    156. 

  156. <tr class="altColor">
    157. 

  157. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-double-org.opencv.core.Size-boolean-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    158. 

  158.            int&nbsp;fourcc,
    159. 

  159.            double&nbsp;fps,
    160. 

  160.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    161. 

  161.            boolean&nbsp;isColor)</code>&nbsp;</td>
    162. 

  162. </tr>
    163. 

  163. <tr class="rowColor">
    164. 

  164. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    165. 

  165.            int&nbsp;fourcc,
    166. 

  166.            double&nbsp;fps,
    167. 

  167.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    168. 

  168.            <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</code>
    169. 

  169. <div class="block">The <code>params</code> parameter allows to specify extra encoder parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ...</div>
    170. 

  170. </td>
    171. 

  171. </tr>
    172. 

  172. <tr class="altColor">
    173. 

  173. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    174. 

  174.            int&nbsp;apiPreference,
    175. 

  175.            int&nbsp;fourcc,
    176. 

  176.            double&nbsp;fps,
    177. 

  177.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</code>
    178. 

  178. <div class="block">The <code>apiPreference</code> parameter allows to specify API backends to use.</div>
    179. 

  179. </td>
    180. 

  180. </tr>
    181. 

  181. <tr class="rowColor">
    182. 

  182. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-boolean-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    183. 

  183.            int&nbsp;apiPreference,
    184. 

  184.            int&nbsp;fourcc,
    185. 

  185.            double&nbsp;fps,
    186. 

  186.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    187. 

  187.            boolean&nbsp;isColor)</code>
    188. 

  188. <div class="block">The <code>apiPreference</code> parameter allows to specify API backends to use.</div>
    189. 

  189. </td>
    190. 

  190. </tr>
    191. 

  191. <tr class="altColor">
    192. 

  192. <td class="colOne"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">VideoWriter</a></span>(java.lang.String&nbsp;filename,
    193. 

  193.            int&nbsp;apiPreference,
    194. 

  194.            int&nbsp;fourcc,
    195. 

  195.            double&nbsp;fps,
    196. 

  196.            <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    197. 

  197.            <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</code>&nbsp;</td>
    198. 

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  207. <h3>Method Summary</h3>
    208. 

  208. <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
    209. 

  209. <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
    210. 

  210. <tr>
    211. 

  211. <th class="colFirst" scope="col">Modifier and Type</th>
    212. 

  212. <th class="colLast" scope="col">Method and Description</th>
    213. 

  213. </tr>
    214. 

  214. <tr id="i0" class="altColor">
    215. 

  215. <td class="colFirst"><code>static <a href="../../../org/opencv/videoio/VideoWriter.html" title="class in org.opencv.videoio">VideoWriter</a></code></td>
    216. 

  216. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#Z:Z__fromPtr__-long-">__fromPtr__</a></span>(long&nbsp;addr)</code>&nbsp;</td>
    217. 

  217. </tr>
    218. 

  218. <tr id="i1" class="rowColor">
    219. 

  219. <td class="colFirst"><code>static int</code></td>
    220. 

  220. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#fourcc-char-char-char-char-">fourcc</a></span>(char&nbsp;c1,
    221. 

  221.       char&nbsp;c2,
    222. 

  222.       char&nbsp;c3,
    223. 

  223.       char&nbsp;c4)</code>
    224. 

  224. <div class="block">Concatenates 4 chars to a fourcc code</div>
    225. 

  225. </td>
    226. 

  226. </tr>
    227. 

  227. <tr id="i2" class="altColor">
    228. 

  228. <td class="colFirst"><code>double</code></td>
    229. 

  229. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#get-int-">get</a></span>(int&nbsp;propId)</code>
    230. 

  230. <div class="block">Returns the specified VideoWriter property</div>
    231. 

  231. </td>
    232. 

  232. </tr>
    233. 

  233. <tr id="i3" class="rowColor">
    234. 

  234. <td class="colFirst"><code>java.lang.String</code></td>
    235. 

  235. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#getBackendName--">getBackendName</a></span>()</code>
    236. 

  236. <div class="block">Returns used backend API name
    237. 

  237. 

  238.       <b>Note:</b> Stream should be opened.</div>
    239. 

  239. </td>
    240. 

  240. </tr>
    241. 

  241. <tr id="i4" class="altColor">
    242. 

  242. <td class="colFirst"><code>long</code></td>
    243. 

  243. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#getNativeObjAddr--">getNativeObjAddr</a></span>()</code>&nbsp;</td>
    244. 

  244. </tr>
    245. 

  245. <tr id="i5" class="rowColor">
    246. 

  246. <td class="colFirst"><code>boolean</code></td>
    247. 

  247. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#isOpened--">isOpened</a></span>()</code>
    248. 

  248. <div class="block">Returns true if video writer has been successfully initialized.</div>
    249. 

  249. </td>
    250. 

  250. </tr>
    251. 

  251. <tr id="i6" class="altColor">
    252. 

  252. <td class="colFirst"><code>boolean</code></td>
    253. 

  253. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-double-org.opencv.core.Size-">open</a></span>(java.lang.String&nbsp;filename,
    254. 

  254.     int&nbsp;fourcc,
    255. 

  255.     double&nbsp;fps,
    256. 

  256.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</code>
    257. 

  257. <div class="block">Initializes or reinitializes video writer.</div>
    258. 

  258. </td>
    259. 

  259. </tr>
    260. 

  260. <tr id="i7" class="rowColor">
    261. 

  261. <td class="colFirst"><code>boolean</code></td>
    262. 

  262. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-double-org.opencv.core.Size-boolean-">open</a></span>(java.lang.String&nbsp;filename,
    263. 

  263.     int&nbsp;fourcc,
    264. 

  264.     double&nbsp;fps,
    265. 

  265.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    266. 

  266.     boolean&nbsp;isColor)</code>
    267. 

  267. <div class="block">Initializes or reinitializes video writer.</div>
    268. 

  268. </td>
    269. 

  269. </tr>
    270. 

  270. <tr id="i8" class="altColor">
    271. 

  271. <td class="colFirst"><code>boolean</code></td>
    272. 

  272. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">open</a></span>(java.lang.String&nbsp;filename,
    273. 

  273.     int&nbsp;fourcc,
    274. 

  274.     double&nbsp;fps,
    275. 

  275.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    276. 

  276.     <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</code>&nbsp;</td>
    277. 

  277. </tr>
    278. 

  278. <tr id="i9" class="rowColor">
    279. 

  279. <td class="colFirst"><code>boolean</code></td>
    280. 

  280. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-int-double-org.opencv.core.Size-">open</a></span>(java.lang.String&nbsp;filename,
    281. 

  281.     int&nbsp;apiPreference,
    282. 

  282.     int&nbsp;fourcc,
    283. 

  283.     double&nbsp;fps,
    284. 

  284.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</code>&nbsp;</td>
    285. 

  285. </tr>
    286. 

  286. <tr id="i10" class="altColor">
    287. 

  287. <td class="colFirst"><code>boolean</code></td>
    288. 

  288. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-int-double-org.opencv.core.Size-boolean-">open</a></span>(java.lang.String&nbsp;filename,
    289. 

  289.     int&nbsp;apiPreference,
    290. 

  290.     int&nbsp;fourcc,
    291. 

  291.     double&nbsp;fps,
    292. 

  292.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    293. 

  293.     boolean&nbsp;isColor)</code>&nbsp;</td>
    294. 

  294. </tr>
    295. 

  295. <tr id="i11" class="rowColor">
    296. 

  296. <td class="colFirst"><code>boolean</code></td>
    297. 

  297. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#open-java.lang.String-int-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">open</a></span>(java.lang.String&nbsp;filename,
    298. 

  298.     int&nbsp;apiPreference,
    299. 

  299.     int&nbsp;fourcc,
    300. 

  300.     double&nbsp;fps,
    301. 

  301.     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    302. 

  302.     <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</code>&nbsp;</td>
    303. 

  303. </tr>
    304. 

  304. <tr id="i12" class="altColor">
    305. 

  305. <td class="colFirst"><code>void</code></td>
    306. 

  306. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#release--">release</a></span>()</code>
    307. 

  307. <div class="block">Closes the video writer.</div>
    308. 

  308. </td>
    309. 

  309. </tr>
    310. 

  310. <tr id="i13" class="rowColor">
    311. 

  311. <td class="colFirst"><code>boolean</code></td>
    312. 

  312. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#set-int-double-">set</a></span>(int&nbsp;propId,
    313. 

  313.    double&nbsp;value)</code>
    314. 

  314. <div class="block">Sets a property in the VideoWriter.</div>
    315. 

  315. </td>
    316. 

  316. </tr>
    317. 

  317. <tr id="i14" class="altColor">
    318. 

  318. <td class="colFirst"><code>void</code></td>
    319. 

  319. <td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/videoio/VideoWriter.html#write-org.opencv.core.Mat-">write</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image)</code>
    320. 

  320. <div class="block">Writes the next video frame</div>
    321. 

  321. </td>
    322. 

  322. </tr>
    323. 

  323. </table>
    324. 

  324. <ul class="blockList">
    325. 

  325. <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
    326. 

  326. <!--   -->
    327. 

  327. </a>
    328. 

  328. <h3>Methods inherited from class&nbsp;java.lang.Object</h3>
    329. 

  329. <code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
    330. 

  330. </ul>
    331. 

  331. </li>
    332. 

  332. </ul>
    333. 

  333. </li>
    334. 

  334. </ul>
    335. 

  335. </div>
    336. 

  336. <div class="details">
    337. 

  337. <ul class="blockList">
    338. 

  338. <li class="blockList">
    339. 

  339. <!-- ========= CONSTRUCTOR DETAIL ======== -->
    340. 

  340. <ul class="blockList">
    341. 

  341. <li class="blockList"><a name="constructor.detail">
    342. 

  342. <!--   -->
    343. 

  343. </a>
    344. 

  344. <h3>Constructor Detail</h3>
    345. 

  345. <a name="VideoWriter--">
    346. 

  346. <!--   -->
    347. 

  347. </a>
    348. 

  348. <ul class="blockList">
    349. 

  349. <li class="blockList">
    350. 

  350. <h4>VideoWriter</h4>
    351. 

  351. <pre>public&nbsp;VideoWriter()</pre>
    352. 

  352. <div class="block">Default constructors
    353. 

  353. 

  354.      The constructors/functions initialize video writers.
    355. 

  355.  <ul>
    356. 

  356.    <li>
    357. 

  357.         On Linux FFMPEG is used to write videos;
    358. 

  358.    </li>
    359. 

  359.    <li>
    360. 

  360.         On Windows FFMPEG or MSWF or DSHOW is used;
    361. 

  361.    </li>
    362. 

  362.    <li>
    363. 

  363.         On MacOSX AVFoundation is used.
    364. 

  364.    </li>
    365. 

  365.  </ul></div>
    366. 

  366. </li>
    367. 

  367. </ul>
    368. 

  368. <a name="VideoWriter-java.lang.String-int-double-org.opencv.core.Size-">
    369. 

  369. <!--   -->
    370. 

  370. </a>
    371. 

  371. <ul class="blockList">
    372. 

  372. <li class="blockList">
    373. 

  373. <h4>VideoWriter</h4>
    374. 

  374. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    375. 

  375.                    int&nbsp;fourcc,
    376. 

  376.                    double&nbsp;fps,
    377. 

  377.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</pre>
    378. 

  378. <dl>
    379. 

  379. <dt><span class="paramLabel">Parameters:</span></dt>
    380. 

  380. <dd><code>filename</code> - Name of the output video file.</dd>
    381. 

  381. <dd><code>fourcc</code> - 4-character code of codec used to compress the frames. For example,
    382. 

  382.      VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G')
    383. 

  383.      is a motion-jpeg codec etc. List of codes can be obtained at
    384. 

  384.      [MSDN](https://docs.microsoft.com/en-us/windows/win32/medfound/video-fourccs) page
    385. 

  385.      or with this [archived page](https://web.archive.org/web/20220316062600/http://www.fourcc.org/codecs.php)
    386. 

  386.      of the fourcc site for a more complete list). FFMPEG backend with MP4 container natively uses
    387. 

  387.      other values as fourcc code: see [ObjectType](http://mp4ra.org/#/codecs),
    388. 

  388.      so you may receive a warning message from OpenCV about fourcc code conversion.</dd>
    389. 

  389. <dd><code>fps</code> - Framerate of the created video stream.</dd>
    390. 

  390. <dd><code>frameSize</code> - Size of the video frames.
    391. 

  391.      will work with grayscale frames.
    392. 

  392. 

  393.      <b>Tips</b>:
    394. 

  394.  <ul>
    395. 

  395.    <li>
    396. 

  396.       With some backends <code>fourcc=-1</code> pops up the codec selection dialog from the system.
    397. 

  397.    </li>
    398. 

  398.    <li>
    399. 

  399.       To save image sequence use a proper filename (eg. <code>img_%02d.jpg</code>) and <code>fourcc=0</code>
    400. 

  400.        OR <code>fps=0</code>. Use uncompressed image format (eg. <code>img_%02d.BMP</code>) to save raw frames.
    401. 

  401.    </li>
    402. 

  402.    <li>
    403. 

  403.       Most codecs are lossy. If you want lossless video file you need to use a lossless codecs
    404. 

  404.        (eg. FFMPEG FFV1, Huffman HFYU, Lagarith LAGS, etc...)
    405. 

  405.    </li>
    406. 

  406.    <li>
    407. 

  407.       If FFMPEG is enabled, using <code>codec=0; fps=0;</code> you can create an uncompressed (raw) video file.
    408. 

  408.    </li>
    409. 

  409.  </ul></dd>
    410. 

  410. </dl>
    411. 

  411. </li>
    412. 

  412. </ul>
    413. 

  413. <a name="VideoWriter-java.lang.String-int-double-org.opencv.core.Size-boolean-">
    414. 

  414. <!--   -->
    415. 

  415. </a>
    416. 

  416. <ul class="blockList">
    417. 

  417. <li class="blockList">
    418. 

  418. <h4>VideoWriter</h4>
    419. 

  419. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    420. 

  420.                    int&nbsp;fourcc,
    421. 

  421.                    double&nbsp;fps,
    422. 

  422.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    423. 

  423.                    boolean&nbsp;isColor)</pre>
    424. 

  424. <dl>
    425. 

  425. <dt><span class="paramLabel">Parameters:</span></dt>
    426. 

  426. <dd><code>filename</code> - Name of the output video file.</dd>
    427. 

  427. <dd><code>fourcc</code> - 4-character code of codec used to compress the frames. For example,
    428. 

  428.      VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G')
    429. 

  429.      is a motion-jpeg codec etc. List of codes can be obtained at
    430. 

  430.      [MSDN](https://docs.microsoft.com/en-us/windows/win32/medfound/video-fourccs) page
    431. 

  431.      or with this [archived page](https://web.archive.org/web/20220316062600/http://www.fourcc.org/codecs.php)
    432. 

  432.      of the fourcc site for a more complete list). FFMPEG backend with MP4 container natively uses
    433. 

  433.      other values as fourcc code: see [ObjectType](http://mp4ra.org/#/codecs),
    434. 

  434.      so you may receive a warning message from OpenCV about fourcc code conversion.</dd>
    435. 

  435. <dd><code>fps</code> - Framerate of the created video stream.</dd>
    436. 

  436. <dd><code>frameSize</code> - Size of the video frames.</dd>
    437. 

  437. <dd><code>isColor</code> - If it is not zero, the encoder will expect and encode color frames, otherwise it
    438. 

  438.      will work with grayscale frames.
    439. 

  439. 

  440.      <b>Tips</b>:
    441. 

  441.  <ul>
    442. 

  442.    <li>
    443. 

  443.       With some backends <code>fourcc=-1</code> pops up the codec selection dialog from the system.
    444. 

  444.    </li>
    445. 

  445.    <li>
    446. 

  446.       To save image sequence use a proper filename (eg. <code>img_%02d.jpg</code>) and <code>fourcc=0</code>
    447. 

  447.        OR <code>fps=0</code>. Use uncompressed image format (eg. <code>img_%02d.BMP</code>) to save raw frames.
    448. 

  448.    </li>
    449. 

  449.    <li>
    450. 

  450.       Most codecs are lossy. If you want lossless video file you need to use a lossless codecs
    451. 

  451.        (eg. FFMPEG FFV1, Huffman HFYU, Lagarith LAGS, etc...)
    452. 

  452.    </li>
    453. 

  453.    <li>
    454. 

  454.       If FFMPEG is enabled, using <code>codec=0; fps=0;</code> you can create an uncompressed (raw) video file.
    455. 

  455.    </li>
    456. 

  456.  </ul></dd>
    457. 

  457. </dl>
    458. 

  458. </li>
    459. 

  459. </ul>
    460. 

  460. <a name="VideoWriter-java.lang.String-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">
    461. 

  461. <!--   -->
    462. 

  462. </a>
    463. 

  463. <ul class="blockList">
    464. 

  464. <li class="blockList">
    465. 

  465. <h4>VideoWriter</h4>
    466. 

  466. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    467. 

  467.                    int&nbsp;fourcc,
    468. 

  468.                    double&nbsp;fps,
    469. 

  469.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    470. 

  470.                    <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</pre>
    471. 

  471. <div class="block">The <code>params</code> parameter allows to specify extra encoder parameters encoded as pairs (paramId_1, paramValue_1, paramId_2, paramValue_2, ... .)
    472. 

  472.  see cv::VideoWriterProperties</div>
    473. 

  473. <dl>
    474. 

  474. <dt><span class="paramLabel">Parameters:</span></dt>
    475. 

  475. <dd><code>filename</code> - automatically generated</dd>
    476. 

  476. <dd><code>fourcc</code> - automatically generated</dd>
    477. 

  477. <dd><code>fps</code> - automatically generated</dd>
    478. 

  478. <dd><code>frameSize</code> - automatically generated</dd>
    479. 

  479. <dd><code>params</code> - automatically generated</dd>
    480. 

  480. </dl>
    481. 

  481. </li>
    482. 

  482. </ul>
    483. 

  483. <a name="VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-">
    484. 

  484. <!--   -->
    485. 

  485. </a>
    486. 

  486. <ul class="blockList">
    487. 

  487. <li class="blockList">
    488. 

  488. <h4>VideoWriter</h4>
    489. 

  489. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    490. 

  490.                    int&nbsp;apiPreference,
    491. 

  491.                    int&nbsp;fourcc,
    492. 

  492.                    double&nbsp;fps,
    493. 

  493.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</pre>
    494. 

  494. <div class="block">The <code>apiPreference</code> parameter allows to specify API backends to use. Can be used to enforce a specific reader implementation
    495. 

  495.      if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_GSTREAMER.</div>
    496. 

  496. <dl>
    497. 

  497. <dt><span class="paramLabel">Parameters:</span></dt>
    498. 

  498. <dd><code>filename</code> - automatically generated</dd>
    499. 

  499. <dd><code>apiPreference</code> - automatically generated</dd>
    500. 

  500. <dd><code>fourcc</code> - automatically generated</dd>
    501. 

  501. <dd><code>fps</code> - automatically generated</dd>
    502. 

  502. <dd><code>frameSize</code> - automatically generated</dd>
    503. 

  503. </dl>
    504. 

  504. </li>
    505. 

  505. </ul>
    506. 

  506. <a name="VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-boolean-">
    507. 

  507. <!--   -->
    508. 

  508. </a>
    509. 

  509. <ul class="blockList">
    510. 

  510. <li class="blockList">
    511. 

  511. <h4>VideoWriter</h4>
    512. 

  512. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    513. 

  513.                    int&nbsp;apiPreference,
    514. 

  514.                    int&nbsp;fourcc,
    515. 

  515.                    double&nbsp;fps,
    516. 

  516.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    517. 

  517.                    boolean&nbsp;isColor)</pre>
    518. 

  518. <div class="block">The <code>apiPreference</code> parameter allows to specify API backends to use. Can be used to enforce a specific reader implementation
    519. 

  519.      if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_GSTREAMER.</div>
    520. 

  520. <dl>
    521. 

  521. <dt><span class="paramLabel">Parameters:</span></dt>
    522. 

  522. <dd><code>filename</code> - automatically generated</dd>
    523. 

  523. <dd><code>apiPreference</code> - automatically generated</dd>
    524. 

  524. <dd><code>fourcc</code> - automatically generated</dd>
    525. 

  525. <dd><code>fps</code> - automatically generated</dd>
    526. 

  526. <dd><code>frameSize</code> - automatically generated</dd>
    527. 

  527. <dd><code>isColor</code> - automatically generated</dd>
    528. 

  528. </dl>
    529. 

  529. </li>
    530. 

  530. </ul>
    531. 

  531. <a name="VideoWriter-java.lang.String-int-int-double-org.opencv.core.Size-org.opencv.core.MatOfInt-">
    532. 

  532. <!--   -->
    533. 

  533. </a>
    534. 

  534. <ul class="blockListLast">
    535. 

  535. <li class="blockList">
    536. 

  536. <h4>VideoWriter</h4>
    537. 

  537. <pre>public&nbsp;VideoWriter(java.lang.String&nbsp;filename,
    538. 

  538.                    int&nbsp;apiPreference,
    539. 

  539.                    int&nbsp;fourcc,
    540. 

  540.                    double&nbsp;fps,
    541. 

  541.                    <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    542. 

  542.                    <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</pre>
    543. 

  543. </li>
    544. 

  544. </ul>
    545. 

  545. </li>
    546. 

  546. </ul>
    547. 

  547. <!-- ============ METHOD DETAIL ========== -->
    548. 

  548. <ul class="blockList">
    549. 

  549. <li class="blockList"><a name="method.detail">
    550. 

  550. <!--   -->
    551. 

  551. </a>
    552. 

  552. <h3>Method Detail</h3>
    553. 

  553. <a name="Z:Z__fromPtr__-long-">
    554. 

  554. <!--   -->
    555. 

  555. </a>
    556. 

  556. <ul class="blockList">
    557. 

  557. <li class="blockList">
    558. 

  558. <h4>__fromPtr__</h4>
    559. 

  559. <pre>public static&nbsp;<a href="../../../org/opencv/videoio/VideoWriter.html" title="class in org.opencv.videoio">VideoWriter</a>&nbsp;__fromPtr__(long&nbsp;addr)</pre>
    560. 

  560. </li>
    561. 

  561. </ul>
    562. 

  562. <a name="fourcc-char-char-char-char-">
    563. 

  563. <!--   -->
    564. 

  564. </a>
    565. 

  565. <ul class="blockList">
    566. 

  566. <li class="blockList">
    567. 

  567. <h4>fourcc</h4>
    568. 

  568. <pre>public static&nbsp;int&nbsp;fourcc(char&nbsp;c1,
    569. 

  569.                          char&nbsp;c2,
    570. 

  570.                          char&nbsp;c3,
    571. 

  571.                          char&nbsp;c4)</pre>
    572. 

  572. <div class="block">Concatenates 4 chars to a fourcc code</div>
    573. 

  573. <dl>
    574. 

  574. <dt><span class="paramLabel">Parameters:</span></dt>
    575. 

  575. <dd><code>c1</code> - automatically generated</dd>
    576. 

  576. <dd><code>c2</code> - automatically generated</dd>
    577. 

  577. <dd><code>c3</code> - automatically generated</dd>
    578. 

  578. <dd><code>c4</code> - automatically generated</dd>
    579. 

  579. <dt><span class="returnLabel">Returns:</span></dt>
    580. 

  580. <dd>a fourcc code
    581. 

  581. 

  582.      This static method constructs the fourcc code of the codec to be used in the constructor
    583. 

  583.      VideoWriter::VideoWriter or VideoWriter::open.</dd>
    584. 

  584. </dl>
    585. 

  585. </li>
    586. 

  586. </ul>
    587. 

  587. <a name="get-int-">
    588. 

  588. <!--   -->
    589. 

  589. </a>
    590. 

  590. <ul class="blockList">
    591. 

  591. <li class="blockList">
    592. 

  592. <h4>get</h4>
    593. 

  593. <pre>public&nbsp;double&nbsp;get(int&nbsp;propId)</pre>
    594. 

  594. <div class="block">Returns the specified VideoWriter property</div>
    595. 

  595. <dl>
    596. 

  596. <dt><span class="paramLabel">Parameters:</span></dt>
    597. 

  597. <dd><code>propId</code> - Property identifier from cv::VideoWriterProperties (eg. cv::VIDEOWRITER_PROP_QUALITY)
    598. 

  598.       or one of REF: videoio_flags_others</dd>
    599. 

  599. <dt><span class="returnLabel">Returns:</span></dt>
    600. 

  600. <dd>Value for the specified property. Value 0 is returned when querying a property that is
    601. 

  601.       not supported by the backend used by the VideoWriter instance.</dd>
    602. 

  602. </dl>
    603. 

  603. </li>
    604. 

  604. </ul>
    605. 

  605. <a name="getBackendName--">
    606. 

  606. <!--   -->
    607. 

  607. </a>
    608. 

  608. <ul class="blockList">
    609. 

  609. <li class="blockList">
    610. 

  610. <h4>getBackendName</h4>
    611. 

  611. <pre>public&nbsp;java.lang.String&nbsp;getBackendName()</pre>
    612. 

  612. <div class="block">Returns used backend API name
    613. 

  613. 

  614.       <b>Note:</b> Stream should be opened.</div>
    615. 

  615. <dl>
    616. 

  616. <dt><span class="returnLabel">Returns:</span></dt>
    617. 

  617. <dd>automatically generated</dd>
    618. 

  618. </dl>
    619. 

  619. </li>
    620. 

  620. </ul>
    621. 

  621. <a name="getNativeObjAddr--">
    622. 

  622. <!--   -->
    623. 

  623. </a>
    624. 

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    625. 

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    626. 

  626. <h4>getNativeObjAddr</h4>
    627. 

  627. <pre>public&nbsp;long&nbsp;getNativeObjAddr()</pre>
    628. 

  628. </li>
    629. 

  629. </ul>
    630. 

  630. <a name="isOpened--">
    631. 

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    632. 

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    633. 

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    635. 

  635. <h4>isOpened</h4>
    636. 

  636. <pre>public&nbsp;boolean&nbsp;isOpened()</pre>
    637. 

  637. <div class="block">Returns true if video writer has been successfully initialized.</div>
    638. 

  638. <dl>
    639. 

  639. <dt><span class="returnLabel">Returns:</span></dt>
    640. 

  640. <dd>automatically generated</dd>
    641. 

  641. </dl>
    642. 

  642. </li>
    643. 

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    644. 

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    648. 

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    649. 

  649. <h4>open</h4>
    650. 

  650. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    651. 

  651.                     int&nbsp;fourcc,
    652. 

  652.                     double&nbsp;fps,
    653. 

  653.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</pre>
    654. 

  654. <div class="block">Initializes or reinitializes video writer.
    655. 

  655. 

  656.      The method opens video writer. Parameters are the same as in the constructor
    657. 

  657.      VideoWriter::VideoWriter.</div>
    658. 

  658. <dl>
    659. 

  659. <dt><span class="paramLabel">Parameters:</span></dt>
    660. 

  660. <dd><code>filename</code> - automatically generated</dd>
    661. 

  661. <dd><code>fourcc</code> - automatically generated</dd>
    662. 

  662. <dd><code>fps</code> - automatically generated</dd>
    663. 

  663. <dd><code>frameSize</code> - automatically generated</dd>
    664. 

  664. <dt><span class="returnLabel">Returns:</span></dt>
    665. 

  665. <dd><code>true</code> if video writer has been successfully initialized
    666. 

  666. 

  667.      The method first calls VideoWriter::release to close the already opened file.</dd>
    668. 

  668. </dl>
    669. 

  669. </li>
    670. 

  670. </ul>
    671. 

  671. <a name="open-java.lang.String-int-double-org.opencv.core.Size-boolean-">
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    676. 

  676. <h4>open</h4>
    677. 

  677. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    678. 

  678.                     int&nbsp;fourcc,
    679. 

  679.                     double&nbsp;fps,
    680. 

  680.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    681. 

  681.                     boolean&nbsp;isColor)</pre>
    682. 

  682. <div class="block">Initializes or reinitializes video writer.
    683. 

  683. 

  684.      The method opens video writer. Parameters are the same as in the constructor
    685. 

  685.      VideoWriter::VideoWriter.</div>
    686. 

  686. <dl>
    687. 

  687. <dt><span class="paramLabel">Parameters:</span></dt>
    688. 

  688. <dd><code>filename</code> - automatically generated</dd>
    689. 

  689. <dd><code>fourcc</code> - automatically generated</dd>
    690. 

  690. <dd><code>fps</code> - automatically generated</dd>
    691. 

  691. <dd><code>frameSize</code> - automatically generated</dd>
    692. 

  692. <dd><code>isColor</code> - automatically generated</dd>
    693. 

  693. <dt><span class="returnLabel">Returns:</span></dt>
    694. 

  694. <dd><code>true</code> if video writer has been successfully initialized
    695. 

  695. 

  696.      The method first calls VideoWriter::release to close the already opened file.</dd>
    697. 

  697. </dl>
    698. 

  698. </li>
    699. 

  699. </ul>
    700. 

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    702. 

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    705. 

  705. <h4>open</h4>
    706. 

  706. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    707. 

  707.                     int&nbsp;fourcc,
    708. 

  708.                     double&nbsp;fps,
    709. 

  709.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    710. 

  710.                     <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</pre>
    711. 

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    718. 

  718. <h4>open</h4>
    719. 

  719. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    720. 

  720.                     int&nbsp;apiPreference,
    721. 

  721.                     int&nbsp;fourcc,
    722. 

  722.                     double&nbsp;fps,
    723. 

  723.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize)</pre>
    724. 

  724. </li>
    725. 

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    726. 

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    730. 

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  731. <h4>open</h4>
    732. 

  732. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    733. 

  733.                     int&nbsp;apiPreference,
    734. 

  734.                     int&nbsp;fourcc,
    735. 

  735.                     double&nbsp;fps,
    736. 

  736.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    737. 

  737.                     boolean&nbsp;isColor)</pre>
    738. 

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    739. 

  739. </ul>
    740. 

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    745. 

  745. <h4>open</h4>
    746. 

  746. <pre>public&nbsp;boolean&nbsp;open(java.lang.String&nbsp;filename,
    747. 

  747.                     int&nbsp;apiPreference,
    748. 

  748.                     int&nbsp;fourcc,
    749. 

  749.                     double&nbsp;fps,
    750. 

  750.                     <a href="../../../org/opencv/core/Size.html" title="class in org.opencv.core">Size</a>&nbsp;frameSize,
    751. 

  751.                     <a href="../../../org/opencv/core/MatOfInt.html" title="class in org.opencv.core">MatOfInt</a>&nbsp;params)</pre>
    752. 

  752. </li>
    753. 

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    754. 

  754. <a name="release--">
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    759. 

  759. <h4>release</h4>
    760. 

  760. <pre>public&nbsp;void&nbsp;release()</pre>
    761. 

  761. <div class="block">Closes the video writer.
    762. 

  762. 

  763.      The method is automatically called by subsequent VideoWriter::open and by the VideoWriter
    764. 

  764.      destructor.</div>
    765. 

  765. </li>
    766. 

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    767. 

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    773. 

  773. <pre>public&nbsp;boolean&nbsp;set(int&nbsp;propId,
    774. 

  774.                    double&nbsp;value)</pre>
    775. 

  775. <div class="block">Sets a property in the VideoWriter.</div>
    776. 

  776. <dl>
    777. 

  777. <dt><span class="paramLabel">Parameters:</span></dt>
    778. 

  778. <dd><code>propId</code> - Property identifier from cv::VideoWriterProperties (eg. cv::VIDEOWRITER_PROP_QUALITY)
    779. 

  779.       or one of REF: videoio_flags_others</dd>
    780. 

  780. <dd><code>value</code> - Value of the property.</dd>
    781. 

  781. <dt><span class="returnLabel">Returns:</span></dt>
    782. 

  782. <dd><code>true</code> if the property is supported by the backend used by the VideoWriter instance.</dd>
    783. 

  783. </dl>
    784. 

  784. </li>
    785. 

  785. </ul>
    786. 

  786. <a name="write-org.opencv.core.Mat-">
    787. 

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    788. 

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    789. 

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    790. 

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    791. 

  791. <h4>write</h4>
    792. 

  792. <pre>public&nbsp;void&nbsp;write(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image)</pre>
    793. 

  793. <div class="block">Writes the next video frame</div>
    794. 

  794. <dl>
    795. 

  795. <dt><span class="paramLabel">Parameters:</span></dt>
    796. 

  796. <dd><code>image</code> - The written frame. In general, color images are expected in BGR format.
    797. 

  797. 

  798.      The function/method writes the specified image to video file. It must have the same size as has
    799. 

  799.      been specified when opening the video writer.</dd>
    800. 

  800. </dl>
    801. 

  801. </li>
    802. 

  802. </ul>
    803. 

  803. </li>
    804. 

  804. </ul>
    805. 

  805. </li>
    806. 

  806. </ul>
    807. 

  807. </div>
    808. 

  808. </div>
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