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• FFMPEG Create internal pipeline for adding raw frames to AVI file (no input file)

  12 juillet 2018, par Katie

  I have an application that reads in a raw video file, does some image processing to each frame, then feeds the resulting BGRA-format byte[] frames to the FFMPEG container to eventually create an AVI file. Since this process works slightly differently than any other FFMPEG example I’ve seen in that it does not have an existing input file, I’m wondering if anyone knows how to do this.

  I initialize the FFMPEG container :

  ProcessBuilder pBuilder = new ProcessBuilder(raid.getLocation()
  
                  + "\\ffmpeg\\bin\\ffmpeg.exe", "-r", "30", "-vcodec",
  
                  "rawvideo", "-f", "rawvideo", "-pix_fmt", "bgra", "-s",
  
                  size, "-i", "pipe:0", "-r", "30", "-y", "-c:v", "libx264",
  
                  "C:\export\2015-02-03\1500\EXPORT6.avi");
  
  
  
   try
  
   {
  
       process = pBuilder.start();
  
   }
  
   catch (IOException e)
  
   {
  
       e.printStackTrace();
  
   }
  
  
  
    ffmpegInput = process.getOutputStream();

  For each incoming byte[] array frame, I add the frame to the container ("src" is a BufferedImage that I’m converting to a byte array) :

  try
  
  {
  
       ByteArrayOutputStream baos = new ByteArrayOutputStream();
  
       ImageIO.write(src, ".png", baos);
  
       ffmpegInput.write(baos.toByteArray());
  
  }
  
  catch (IOException e)
  
  {
  
       e.printStackTrace();
  
  }

  And once the video is finished loading frames, I close the container :

  try
  
  {
  
       ffmpegInput.flush();
  
       ffmpegInput.close();
  
  }
  
  catch (IOException e)
  
  {
  
       e.printStackTrace();
  
  }

  The AVI file is created but it displays an error when opening. The FFMPEG logger displays this as the error :

  ffmpeg version N-71102-g1f5d1ee Copyright (c) 2000-2015 the FFmpeg developers built with gcc 4.9.2 (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-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 20.101 / 54. 20.101
  
    libavcodec     56. 30.100 / 56. 30.100
  
    libavformat    56. 26.101 / 56. 26.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 13.101 /  5. 13.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rawvideo, from 'pipe:0':
  
    Duration: N/A, bitrate: 294912 kb/s
  
      Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 640x480, 294912 kb/s, 30 tbr, 30 tbn, 30 tbc
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 00000000003bcbe0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 00000000003bcbe0] profile High 4:4:4 Predictive, level 3.0, 4:4:4 8-bit
  
  Output #0, avi, to 'C:\export\2015-02-03\1500\EXPORT6.avi':
  
    Metadata:
  
      ISFT            : Lavf56.26.101
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 640x480, q=-1--1, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc56.30.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  frame=    0 fps=0.0 q=0.0 Lsize=       6kB time=00:00:00.00 bitrate=N/A    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  Any insight or ideas would be greatly appreciated !

• avcodec/decode : flush the internal bsfs instead of constantly reinitalizing them

  27 juillet 2018, par James Almer

  avcodec/decode : flush the internal bsfs instead of constantly reinitalizing them
  Initialize the bsfs once when opening the codec and uninitialize them once when
  
  closing it, instead of at every codec flush/seek.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/decode.c
  • [DH] libavcodec/decode.h
  • [DH] libavcodec/utils.c

• decode : flush the internal bsfs instead of constantly reinitalizing them

  27 juillet 2018, par James Almer

  decode : flush the internal bsfs instead of constantly reinitalizing them
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DBH] libavcodec/decode.c
  • [DBH] libavcodec/decode.h
  • [DBH] libavcodec/utils.c