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• Can somebody compare the decoding speed of popular audio formats ? [on hold]

  23 novembre 2017, par puppon -su

  People usually quote compression ratio, but I’m interested in how well they perform on old computers and mobile phones. I’m interested in cpu usage, battery usage, and if they require/benefit from SIMD.

  I’m not sure if it still matters by now, everyone seems to buy new hardware every few years.

• Pause/resume ffmpeg transcoding process

  27 janvier 2014, par XXX

  In my Android application I use Ffmpeg library written in C++. I use ffmpeg command ffmpeg -y -i in.mp4 -s 320x240 -c:a copy out.mp4 to reduce the size of media files on Android. Everything works well. But if the file is too large, then the smartphone's battery heats up. And I have a question : is it possible to stop a ffmpeg process, and then continue it later on ? When I am converting a large file, I would like to be able to start from where I left off. Or is there any way to avoid heating the battery. May be this way : cut the file into pieces, reduce each separately and paste together ?

  UPDATE

  I found this Pause any process you want in Linux. So I decided to try to apply it on Android.

  public static void pause()
  
  {
  
      try
  
      {
  
          Process      sh = Runtime.getRuntime().exec("su", null,null);
  
          OutputStream os = sh.getOutputStream();
  
          os.write(("sudo -kill -STOP (pidof Thread-10)").getBytes("ASCII"));
  
          Log.e("!!", "process stopped!");
  
          os.flush();
  
          os.close();
  
          sh.waitFor();
  
      }
  
      catch(Throwable t){t.printStackTrace();}
  
  }

  But the process doesn't stop. Thread-10 it's the name of ffmpeg transcoding process. Whats wrong ?

• Copy 3gp moov atom from one file to another

  1er août 2016, par message

  I was in Norway and I had an awesome time ; I recorded my ride on the sledges, and my HTC Sensation turned off when I finished my ride because my battery ran out.

  When I reached my laptop I found a 630 Mb video file my the phone, but I was not able to play it with VLC. Since I’m using Ubuntu, I tried to ffprobe my file and I received the following :

  [22:22 @ ~/Desktop] $ ffprobe VIDEO0002.3gp 
  
  FFprobe version 0.6-4:0.6-2ubuntu6.3, Copyright (c) 2007-2010 the FFmpeg developers
  
    built on Dec 21 2011 18:43:14 with gcc 4.4.5
  
    configuration: --extra-version=4:0.6-2ubuntu6.3 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-vaapi --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x8c3c010]moov atom not found
  
  VIDEO0002.3gp: Operation not permitted

  I had an idea that I might be able to use an older recorded video from my phone and simply copy the moov atom from that working file to the broken one. Any ideas about that ? How can I fix this problem ?