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• Java 8 does not wait for ffmpeg process output buffer read completion

  13 février 2018, par Nitishkumar Singh

  We need to create multiple clips from video, to do so we are using ProcessBuilder to create a new processes, Please fine code below

  Process clipProcess = new ProcessBuilder("bash","-c",
  
              "ffmpeg -i input.mp4 -ss 0:36:00.000 -codec copy -t 0:03:00.200 -threads 0 -y output.mp4").start();
  
  clipProcess.waitFor();

  We need to perform some operation on the clips, as the processing get’s done and file is completely written to disk. But program returns control to next statement, even though file is not completely written to disk. Any suggestion, what I am doing wrong ?

  Edit :
  We are able to handle clips generated from any video below 45 minutes, but after that generated clips does not completely get written to disk before processing

• Get data from native process on Android

  22 octobre 2013, par Gonzalo Solera

  I´m converting a video with my app, and I got it using the FFmpeg library. I´m using a static compiled version of FFmpeg and I run my command like this :

          //Conversion video
  
          try {
  
              Process p = Runtime.getRuntime().exec("data/data/package/cache/ffmpeg -i "   path   " -g "   String.valueOf(keyFrames)   " -s 720x480 -vcodec libx264 -an -y /sdcard/lowResolution.mp4");
  
              p.waitFor();
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          } catch (InterruptedException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
          Log.d(TAG, "Video convertido"); 

  It works well but it takes me too much time, so I would like to put a progress bar, so I should need to read output events of the process (the same output I can see when I execute the command in terminal) in order to know how long will it take or something like that.

  Sorry for my english and thanks for help !!

• mp4 subtitle issue of traf/trun

  24 octobre 2023, par Tany

  I'm implementing a progressive mp4 muxer to create a fmp4 with h264 video, aac audio, and tx3g subtitles. VLC can currently play the video I created (link), but the subtitles are not shown. I use ffmpeg to create a different video (link) for comparison. I examine the mp4 boxes of these two films using the mp4 parsers bento4-mp4dump(https://www.bento4.com/) and online mp4 parser(https://gpac.github.io/mp4box.js/test/filereader.html) (in particular, moov, moof, tref, trun and subtitle samples)

  


  subtitle samples of ffmpeg generated video :


  


  subtitle samples of my muxer generated video :


  


  moov-trak-mdia-stbl-stsd-tx3g boxes are basically the same.
I can not figure out what's wrong with the moof-traf-trun boxes.

  


  Any help would be greatly appreciated.