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• Android JavaCV FFmpegFrameRecorder Exception Could not open video codec

  11 décembre 2014, par bakua

  I’m working on some encoding in Android and I use JavaCV FFmpegFrameRecorder for that. Thing is that sometims need to restart that process. I have a restart button and on tap I release everything and create it again.

  I do it like that :

  mVideoRecorder.stop();
  
  mVideoRecorder.release();

  And then I :

  mVideoRecorder = new FFmpegFrameRecorder(videoPath, outputResolution.getWidth(), outputResolution.getHeight(), 1);
  
  mVideoRecorder.setFormat(recorderParameters.getVideoOutputFormat());
  
  mVideoRecorder.setSampleRate(recorderParameters.getAudioSamplingRate());
  
  mVideoRecorder.setFrameRate(recorderParameters.getVideoFrameRate());
  
  mVideoRecorder.setVideoCodec(recorderParameters.getVideoCodec());
  
  mVideoRecorder.setVideoQuality(recorderParameters.getVideoQuality());
  
  mVideoRecorder.setAudioQuality(recorderParameters.getVideoQuality());
  
  mVideoRecorder.setAudioCodec(recorderParameters.getAudioCodec());
  
  mVideoRecorder.setVideoBitrate(1000000);
  
  mVideoRecorder.setAudioBitrate(64000);
  
  mVideoRecorder.start();

  But sometimes on the start() line I get this exception :

  com.googlecode.javacv.FrameRecorder$Exception: avcodec_open2() error -22: Could not open video codec.
  
  at com.googlecode.javacv.FFmpegFrameRecorder.start(FFmpegFrameRecorder.java:472)

  I am not able to exactly tell circumstances in which this happens but in most cases it is when I restart two times quickly (double tap the restart button). I am able to catch the exception, but it is useless because it forces app to exit.

  My guess is that it calls start while previous mVideoRecorder is still releasing internally - and therefore has mp4 codec locked for itself or something. But that is just my guess.

  Do you guys have any opinions please ?
  Thank you

• FFMPEG - C# - Audio and Video out of sync on certain videos after concatenation

  10 décembre 2016, par iamanoob

  Hey guys I’ve been trying to make this work for a while now and I can’t seem to find how to make the audio/video synced after the concatenation, I’ve searched and tested some solutions but couldn’t get it working.

  Here is what I do right now, Everything is working but I must be doing something wrong.

  So First, I split the videos into the video that I want

  System.Diagnostics.Process.Start(ffmpegPath, "-i " + 
  
  video.Path + " -ss " + StartTime + " -t " + Duration + " " + video.Output);

  After "cutting/splitting" the videos that I want like I want, I tried concatenating the videos together ( using -safe 0 to use the absolute path, else it wasn’t working ) :

  System.Diagnostics.Process.Start(ffmpegPath, 
  
  "-f concat -safe 0 -i " + txtFile + " C:\\Downloads\\Build\\" + rdn.Next(0,1000) + ".mp4");

  After that , I’ve noticed the audio/video was sometime out of sync so I searched and found this

  so I decided to Pad all the videos after splitting them :

  System.Diagnostics.Process.Start(ffmpegPath, 
  
  "-i " + video.Output + " -af apad -c:v libx264 -shortest -avoid_negative_ts make_zero -fflags +genpts -report " + padding);

  and then building it again, but it ended up having the same audio desync.

  It’s my first time working with mp4s and with FFMPEG and I’m sure I’m missing something.

• How to convert 7sec Video to Gif Android

  21 août 2014, par Donnie Ibiyemi

  Am making an app that convert shot video clips to Gif. i was wondering if there was a libary that directly converts videos to gifs on the Fly on Android.

  I’ve tried to extract all the frames of the video and encode them into a gif but am only getting the the first frame of the video. my code is below :

           public static final int GIF_DELAY_BETWEEN_FRAMES = 100;  
  
           public static final float SPEED_RATIO = 1.1f; 
  
  
  
           Uri videoFileUri=Uri.parse(mOutputFile.toString());
  
          FFmpegMediaMetadataRetriever retriever = new FFmpegMediaMetadataRetriever();
  
          retriever.setDataSource(mOutputFile.getAbsolutePath());
  
           rev = new ArrayList<bitmap>();
  
          MediaPlayer mp = MediaPlayer.create(RecorderActivity.this, videoFileUri);
  
           int millis = mp.getDuration();
  
           for(int i=1000000;itest.gif");
  
              outStream.write(generateGIF());
  
              outStream.close();
  
           }catch(Exception e){
  
              e.printStackTrace();
  
           }
  
  
  
  
  
          public byte[] generateGIF() {
  
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
  
          AnimatedGifEncoder encoder = new AnimatedGifEncoder();
  
          encoder.setDelay((int)(GIF_DELAY_BETWEEN_FRAMES * (1 / SPEED_RATIO)));
  
          encoder.start(bos);
  
          for (Bitmap bitmap : rev) {
  
              encoder.addFrame(bitmap);
  
          }
  
          encoder.finish();
  
          return bos.toByteArray();
  
       }
  
  </bitmap>

  Please help me guys...thanks