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• Using FFMpeg with Runtime.exec() to do a simple transcoding

  1er novembre 2011, par Adam Ingmansson

  I know there are many questions touching this subject, but none have helped me solve my issue.

  Purpose :

  Transcoding a video taken,from a queue, from .mov to h.264 (for now only that)

  Solution :

  Building a java application that gets the next in the queue, transcodes it then repeat

  Problem :

  Running ffmpeg using Runtime.exec() is not working.
  Im using the StreamGobbler from this tutorial to capturing the output from the process.

  This code shows how i start my process :

  String[] command = new String[]{"./ffmpeg/ffmpeg","-i",videoFile.getPath(),"-vcodec","libx264","-fpre",preset,folder + recID + ".flv"};
  
  System.out.println("Running command..");
  
  Process p = r.exec(command);
  
  
  
   // any error message?
  
  StreamGobbler errorGobbler = new 
  
  StreamGobbler(p.getErrorStream(), "ERROR");            
  
  
  
  // any output?
  
  StreamGobbler outputGobbler = new 
  
  StreamGobbler(p.getInputStream(), "OUT");
  
  
  
  // kick them off
  
  errorGobbler.start();
  
  outputGobbler.start();
  
  
  
  //logProcessOutputAndErrors(p);
  
  
  
  int res = p.waitFor();
  
  if (res != 0) {
  
      throw new Exception("Encoding error: "+String.valueOf(res));
  
  }

  and this is the current modified version of StreamGobbler (the important part)

  InputStreamReader isr = new InputStreamReader(is);
  
  BufferedReader br = new BufferedReader(isr);
  
  String line=null;
  
  int c = 0;
  
  StringBuilder str = new StringBuilder();
  
  
  
  while (true) {
  
      c = br.read();
  
  }

  Sometimes ffmpeg just stalls, maybe waiting for my input (although there is no indication on screen).

  Sometimes it just ends.

  Sometimes (when I added the line "System.out.print((char) c) ;" in the while-loop above) i got loads of "¿¿ï" repeated over and over again, wich might be the actual encoding of the video wich I managed to capture instead of to a file.

  For those who wonders why i dont just go with a commandline or maybe even php :

  The purpose is an application that will run 24/7 transcoding anything and everything from a queue. The files are pretty large to begin with and takes about 15 min to transcode.

• Revision 56fa3ab886 : Use non-zero mode threshold for NEARESTMV modes This commit makes the encoder t

  16 septembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_rd.c

  
  
  Use non-zero mode threshold for NEARESTMV modes

  This commit makes the encoder to use non-zero mode threshold for
  NEARESTMV modes. The runtime for test clips of speed 3 is reduced
  by about 1%.

  pedestrian 1080p 2000 kbps, 143239 ms -> 141989 ms
  bus CIF 1000 kbps, 7835 ms -> 7749 ms

  The compression performance change is about -0.02% for both derf
  and stdhd.

  Change-Id : Ib71808922c41ae2997100cb7c561f68dcebfa08e

• Applying filter complex fails with something related to audio

  18 septembre 2014, par Alin

  I finally managed to build ffmpeg as detailed in here : https://enoent.fr/blog/2014/06/20/compile-ffmpeg-for-android/ and in the end, I have a ffmpeg library which accepts command arguments.

  I am trying to apply a watermark image over the video so for it I am using preparing this ffmpeg command :

  ffmpeg -i input.avi -i logo.png -filter_complex 'overlay=10:main_h-overlay_h-10' output.avi

  I have first tried it on windows using ffmpeg.exe and the result was as expected.

  I have tried it on android using the compiled android and the output is as follows :

  09-17 22:03:34.455: I/Videokit(18419): Loading native library compiled at 22:33:10 Sep 15 2014
  
  09-17 22:03:34.455: I/Videokit(18419): Option: ffmpeg
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -loglevel
  
  09-17 22:03:34.455: I/Videokit(18419): Option: debug
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -i
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/vid.mp4
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -i
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/logo.png
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -qscale:v
  
  09-17 22:03:34.455: I/Videokit(18419): Option: 1
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -filter_complex
  
  09-17 22:03:34.455: I/Videokit(18419): Option: overlay=10:main_h-overlay_h-10
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/outVid.mp4
  
  09-17 22:03:34.455: I/Videokit(18419): Running main
  
  09-17 22:03:34.463: D/Videokit(18419): Splitting the commandline.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-loglevel' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-i' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as input file with argument '/storage/emulated/0/vid.mp4'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-i' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as input file with argument '/storage/emulated/0/logo.png'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-qscale:v' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'qscale' (use fixed quality scale (VBR)) with argument '1'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-filter_complex' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'filter_complex' (create a complex filtergraph) with argument 'overlay=10:main_h-overlay_h-10'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '/storage/emulated/0/outVid.mp4' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as output file.
  
  09-17 22:03:34.463: D/Videokit(18419): Finished splitting the commandline.
  
  09-17 22:03:34.463: D/Videokit(18419): Parsing a group of options: global .
  
  09-17 22:03:34.463: D/Videokit(18419): Applying option loglevel (set logging level) with argument debug.
  
  09-17 22:03:34.463: D/Videokit(18419): Applying option filter_complex (create a complex filtergraph) with argument overlay=10:main_h-overlay_h-10.
  
  09-17 22:03:34.463: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.463: D/Videokit(18419): Parsing a group of options: input file /storage/emulated/0/vid.mp4.
  
  09-17 22:03:34.463: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.463: D/Videokit(18419): Opening an input file: /storage/emulated/0/vid.mp4.
  
  09-17 22:03:34.612: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.612: D/Videokit(18419): Parsing a group of options: input file /storage/emulated/0/logo.png.
  
  09-17 22:03:34.612: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.612: D/Videokit(18419): Opening an input file: /storage/emulated/0/logo.png.
  
  09-17 22:03:34.620: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.620: D/Videokit(18419): Parsing a group of options: output file /storage/emulated/0/outVid.mp4.
  
  09-17 22:03:34.620: D/Videokit(18419): Applying option qscale:v (use fixed quality scale (VBR)) with argument 1.
  
  09-17 22:03:34.620: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.620: D/Videokit(18419): Opening an output file: /storage/emulated/0/outVid.mp4.
  
  09-17 22:03:34.627: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.643: I/Videokit(18419): Conversion failed!
  
  09-17 22:03:34.643: I/Videokit(18419): Stream mapping:
  
  09-17 22:03:34.643: E/Videokit(18419): Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  The problem is Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height and this is somehow related to audio of the file. I have removed the audio and I get no error.

  ffmpeg -i vid.mp4 returns this :

  Command line:
  
  ffmpeg -i vid.mp4 -report
  
  ffmpeg version N-66278-g91459bd Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Sep 14 2014 22:05:07 with gcc 4.8.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Splitting the commandline.
  
  Reading option '-i' ... matched as input file with argument 'vid.mp4'.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file vid.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: vid.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] Before avformat_find_stream_info() pos: 19279 bytes read:32768 seeks:0
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] After avformat_find_stream_info() pos: 41952 bytes read:65536 seeks:0 frames:2
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.19.104
  
    Duration: 00:00:14.58, start: 0.023222, bitrate: 1250 kb/s
  
      Stream #0:0(und), 1, 1/11988: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 1099 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und), 1, 1/44100: Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 97 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng), 0, 1/90000: Data: none (rtp  / 0x20707472), 39 kb/s
  
      Metadata:
  
        handler_name    : HintHandler
  
      Stream #0:3(eng), 0, 1/44100: Data: none (rtp  / 0x20707472), 8 kb/s
  
      Metadata:
  
        handler_name    : HintHandler
  
  Successfully opened the file.
  
  At least one output file must be specified
  
  [AVIOContext @ 040e3f40] Statistics: 65536 bytes read, 0 seeks