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• Android Exoplayer garbled mp4 video output on imagereader surface while playing fine on SurfaceView (Samsung galaxy tab s7)

  29 mars 2023, par Orcun

  Problem :

  


  I am trying to play an mp4 video file on Samsung Galaxy Tab S7 for video processing purposes. For the purpose, I use Exoplayer(v2.18.4) library to be able to play the video onto an ImageReader surface so that I can grab the frames in ImageReader.OnImageAvailableListener.

  


  I do not have any problems in getting the frames. However, the frames I acquire are garbled/corrupted like :

  


  

  


  When I saw this frame, it made me think that it is some sort of color format or codec issue for the mp4 file or device I use. In logcat, there are no errors reported.
Device uses [OMX.qcom.video.decoder.avc] decoder. Also, same video plays nicely on some other devices that use exactly the same decoder.

  


  What I tried so far :

  


  I tried a lot of things to understand the root cause and also find a solution, so my brain currently is free flowing stream. I will try to summarise, please bear with me.

  


  I use a CustomMediaCodecVideoRenderer in my app which overrides MediaCodecVideoRenderer.getMediaFormat of Exoplayer to set color format like :

  


  setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible)


  


  This step proved itself necessary. Without it I get a crash simply because I cannot access the image planes of an image frame in expected YUV image format.
This unfortunately was not enough for the Samsung Galaxy Tab 7 although it was already enough for another device like Xiaomi to render the image correctly.

  


  Then I decided to use a library like ffmpeg to modify the mp4 file itself to maybe use a different profile, color format, resolution that is widely compatible in android devices. No luck so far.
a quick ffprobe on my mp4 file shows :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'outputyuv169.mp4':
Metadata:
  major_brand     : isom
  minor_version   : 512
  compatible_brands: isomiso2avc1mp41
  encoder         : Lavf59.16.100
Duration: 00:03:00.02, start: 0.000000, bitrate: 4823 kb/s
Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 
1280x720 [SAR 1:1 DAR 16:9], 4820 kb/s, 30 fps, 30 tbr, 360k tbn (default)


  


  I tried even recording a simple video on the tablet itself and using that as my input file. Nevertheless, still getting similarly garbled frames.

  


  One thing I keep noticing in logcat is this line :

  


  [OMX.qcom.video.decoder.avc] using color format 0x7fa30c04 in place of 0x7f420888

  


  and

  


  [OMX.qcom.video.decoder.avc] Requested output format 0x7f420888 and got 0x7fa30c04

  


  where 0x7fa30c04 refers to YCbCr_420_SP_VENUS_UBWC. Not really sure If this has anything to do with it. I did not dive too deep into that because same log is present also on other device that renders the mp4 correctly.

  


  I would be grateful for any clue.

  


• Crash while using ffmpeg4android using Galaxy s6 edge device

  21 juillet 2016, par Amira Elsayed Ismail

  I am using ffmpeg4android_lib to compress video in my android application, it is working in almost all testing devices but it does not work in Galaxy s6 edge and Galaxy s7 edge.

  my code as following :

  String inputFile = FileManager.getInstance().getRealPathFromVideoUri(context, video);
  
  Log.i("INPUT FILE PATH", inputFile);
  
  
  
  LoadJNI vk = new LoadJNI();
  
  try {
  
          String workFolder = context.getApplicationContext().getFilesDir().getAbsolutePath();
  
          String outputFile = FileManager.getInstance().getFileFullName(ForSaleConstants.VIDEO_FOLDER,
  
          String.format(ForSaleConstants.VIDEO_NAME_FILE_FORMAT,      ForSaleConstants.VIDEO_NAME_FILE_NAME_PREFIX, System.currentTimeMillis()));
  
  
  
          String complexCommand[] = {
  
              "ffmpeg", "-y"
  
              , "-i", inputFile
  
              , "-strict", "experimental"
  
              , "-s", "320x240"
  
              , "-r", "25"
  
              , "-aspect", "4:3"
  
              , "-ab", "48000"
  
              , "-ac", "2"
  
              , "-vcodec", "mpeg4"
  
              , "-movflags", "+faststart"
  
              , "-ar", "22050"
  
              , "-b", "2097k"
  
              , outputFile};
  
              vk.run(complexCommand, workFolder, context.getApplicationContext());
  
              Log.i("OUTPUT FILE PATH", outputFile);
  
              return outputFile;
  
      } catch (Throwable e) {
  
          ForSaleServerManager.getInstance().logAndroidError("Couldn't compress video file");
  
          return null;
  
      }

  The crash as following :

  nativeLibraryDirectories=[/data/app/com.forsale.forsale-1/lib/arm64, /data/app/com.forsale.forsale-1/base.apk!/lib/arm64-v8a, /vendor/lib64, /system/lib64]]] couldn't find "libloader-jni.so"
  
  at java.lang.Runtime.loadLibrary(Runtime.java:367)
  
  at java.lang.System.loadLibrary(System.java:1076)
  
  at com.netcompss.loader.LoadJNI.<clinit>(LoadJNI.java:13)
  
  </clinit>

• Why does ffmpeg4android fail on Galaxy S6 ?

  26 novembre 2015, par Andrei

  I have created an app that uses the ffmpeg4android library found here :
  http://androidwarzone.blogspot.co.il/2011/12/ffmpeg4android.html

  I succesfully managed to encode & crop video using the following command :
  "ffmpeg -y -i [input_video_path] -preset ultrafast -strict -2 -vf crop=480:480 :[startX]:0 -r 25 -ab 48000 -ac 2 -ar 22050 -b 2097k [outputPath]"

  This command works on several devices : motorola G (api 22), galaxy s4 being some of them.

  Yet, on galaxy S6 it crashes when executing the command.
  In the ffmpeg log, it says that it does not recognize the preset option. Can anyone help me understand why and what is the proper fix ?