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• Unable to scrub video after remuxing multiple mpeg-ts to mp4

  21 juillet 2022, par Jona

  I have written custom code to concat multiple mpeg-ts files into an mp4 video file. I've used as reference the remuxing code sample.

  


  I'm having issues with the final output. I'm unable to scrub the video on QuickTime. The final output seems to be missing something.

  


  I compared using ffprobe my custom code remuxer results to that of using the following terminal command :

  


  ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.mp4


  


  To my surprise, the videos look almost identical but I'm noticing some differences in the reported distance and keyframe values. I also did a hex comparison and see minor differences at the end of the file which tells me I've muxed the frames correctly. What could I be missing ? Any tips or ideas would be really helpful !

  


  FFmpeg terminal remuxed video [WORKING VIDEO]


  


  Custom remuxer code video [SCRUBBING BROKEN]


  


  App.mp4 vs ffmpeg.mp4 remuxed video


  


• Font size messes up when I try to hardsub

  7 septembre 2020, par かかし９０００

  I have used the following command for a hardsub and everything worked but the subtitle size increased :

  


  ffmpeg -vsync 0 -i input.mkv -vf "ass=subs.ass" -c:a copy -c:v h264_nvenc -b:v 700k final.mp4


  


  i used a srt type file before using ass but that command made the text size take up almost half the screen and the force_style filter shows it executed properly but there was no change in text size at all

  


  though the ass sub style gets me a proper subtitle size i'd very much like it if the size was appropriate

  


• Can VideoView be detach and reattached without stopping the it ?

  31 octobre 2013, par Thierry-Dimitri Roy

  I'm building an app where the user clicks on a button to show a video full screen. Initially the video is attached to a view inside a ViewPager. To be able to show it fullscreen I detach it from its parent and reattach it to the root view. This works fine, except when the video is switched to fullscreen while playing. When I detach a playing VideoView it just stop and I need to restart it. This is not acceptable since the video starts buffering before resume. Here the part of the code where the detach is done :

      final ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
  
  
  
      final ViewGroup root = (ViewGroup) findViewById(R.id.root);
  
  
  
      Button b = (Button) findViewById(R.id.button);
  
      b.setOnClickListener(new OnClickListener() {
  
  
  
          @Override
  
          public void onClick(View v) {
  
              parent.removeView(mVideoView);
  
  
  
              LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
  
              root.addView(mVideoView, lp);
  
          }
  
      });

  Depending of the device, I have a different log error. Probably because the actual video player is provided by the manufacturer and not the Android SDK. Here are the error logs for a Nexus 7 :

  10-30 20:26:18.618 : D/NvOsDebugPrintf(124) : NvMMDecTVMRDestroyParser Begin
  10-30 20:26:18.618 : D/NvOsDebugPrintf(124) : --------- Closing TVMR Frame Delivery Thread -------------
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : ------- NvAvpClose -------
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : NvMMDecTVMRDestroyParser Done
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : NvMMLiteTVMRDecPrivateClose Done

  I haven't been able to detach the video without stopping it. I tried using SurfaceView or TextureView without success.

  I also tried finding a third party video player. I found a commercial one (http://www.vitamio.org/) that I can't really use for business reason. I found an open source one, that hasn't been updated in the last year (https://code.google.com/p/dolphin-player/).

  I'm currently targeting Android 4.2 or better on tablet only.