Working on a project which requires conversion from video of quicktime to mp4 format Using the javacv maven library
<dependency> <groupId>org.bytedeco</groupId> <artifactId>javacv-platform</artifactId> <version>1.5.8</version> </dependency> Here is the code format using MPEG4 codec
public static ByteArrayOutputStream convertToMp4(String videoId, byte[] file) { classLogger.trace("request is received to convert video: " + videoId + " to mp4"); FFmpegLogCallback.set(); InputStream stream = new ByteArrayInputStream(file); Frame captured_frame = null; FFmpegFrameRecorder recorder = null; FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(stream); SeekableByteArrayOutputStream outputStream = new SeekableByteArrayOutputStream(); try { grabber.start(); System.out.println("grabber frame rate " + grabber.getFrameRate()); //value is 29.85882710114861 recorder = new FFmpegFrameRecorder(outputStream, grabber.getImageWidth(), grabber.getImageHeight(), grabber.getAudioChannels()); recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4); System.out.println("recorder frame rate b4 " + recorder.getFrameRate()); //value is 30.0 recorder.setFormat("mp4"); recorder.setFrameRate(grabber.getFrameRate()); recorder.setAudioMetadata(grabber.getAudioMetadata()); recorder.setAudioOption("crf", "0"); recorder.setAudioQuality(0); recorder.setVideoBitrate(grabber.getVideoBitrate()); recorder.setAudioBitrate(grabber.getAudioBitrate()); recorder.setSampleRate(grabber.getSampleRate()); recorder.setVideoMetadata(grabber.getVideoMetadata()); recorder.start(); while ((captured_frame = grabber.grabFrame()) != null) { try { recorder.setTimestamp(grabber.getTimestamp()); recorder.record(captured_frame); } catch (Exception e) { classLogger.error(e.getMessage()); } } recorder.stop(); recorder.release(); grabber.stop(); grabber.release(); } catch (Exception e) { e.printStackTrace(); } return outputStream; } The following code fails with the error
Error: [mpeg4 @ 0x7f61043a6e40] timebase 19763/590100 not supported by MPEG 4 standard, the maximum admitted value for the timebase denominator is 65535 org.bytedeco.javacv.FFmpegFrameRecorder$Exception: avcodec_open2() error -22: Could not open video codec. (For more details, make sure FFmpegLogCallback.set() has been called.) I tried changing frame rate to alter the value of timebase but was of no help
I also tried changing the codec to H264 and here the video was converted successfully but there was a significant loss in frames and the video quality was distorted. Even though the video was converted successfully there was the following error log during the conversion
Error: [mp4 @ 0x7fc2486d9b80] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 2094878 >= 2094878 av_interleaved_write_frame() error -22 while writing interleaved video packet. (For more details, make sure FFmpegLogCallback.set() has been called.) Any help will be highty appreciated, Thanks
