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POMerging 2 videos using JavaCV, second video has no sound
 

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    <p>This is the code I use:</p> <pre><code>public void stopRecording() throws Exception, com.googlecode.javacv.FrameRecorder.Exception { runAudioThread = false; if (recorder != null &amp;&amp; recording) { recording = false; Log.v(LOG_TAG, "Finishing recording, calling stop and release on recorder"); try { recorder.stop(); recorder.release(); } catch (FFmpegFrameRecorder.Exception e) { e.printStackTrace(); } } Log.i(LOG_TAG, "filename = " + ffmpeg_link); if (i &gt; 0) { Log.i(LOG_TAG, "!!!!!!!!!WILL CONCATENATE"); FrameGrabber grabber1 = new FFmpegFrameGrabber(pathStart + "/JavaCV/stream0.mp4"); grabber1.start(); Log.i(LOG_TAG, "graber1.start"); FrameGrabber grabber2 = new FFmpegFrameGrabber(pathStart + "/JavaCV/stream1.mp4"); grabber2.start(); Log.i(LOG_TAG, "graber2.start"); FrameRecorder recorder2 = new FFmpegFrameRecorder(pathStart + "/JavaCV/output.mp4", grabber1.getImageWidth(), grabber1.getImageHeight(), grabber1.getAudioChannels()); recorder2.setFrameRate(grabber1.getFrameRate()); recorder2.setSampleFormat(grabber1.getSampleFormat()); recorder2.setSampleRate(grabber1.getSampleRate()); Log.i(LOG_TAG, "Recorder.start"); recorder2.start(); Frame frame; int j = 0; while ((frame = grabber1.grabFrame()) != null) { j++; recorder2.record(frame); Log.i(LOG_TAG, "while1 nr:" + j + "Frame number: " + grabber1.getFrameNumber()); } Log.i(LOG_TAG, "after while1"); while ((frame = grabber2.grabFrame()) != null) { recorder2.record(frame); Log.i(LOG_TAG, "while2"); } Log.i(LOG_TAG, "Recorder.stop"); recorder2.stop(); grabber2.stop(); grabber1.stop(); Log.i(LOG_TAG, "end concatenate"); } i++; ffmpeg_link = pathStart + "/JavaCV/stream" + i + ".mp4"; Log.i(LOG_TAG, "next filename = " + ffmpeg_link); } </code></pre> <p>It works great, it manages to merge the videos, the only issue I have is that it does not have sound for the second video. How can i put the audiochannel on the second video also?</p>
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