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• avformat/libopenmpt : Update to libopenmpt 0.3 API

  11 janvier 2018, par Jörn Heusipp

  avformat/libopenmpt : Update to libopenmpt 0.3 API
  libopenmpt 0.3 deprecates openmpt_module_create_from_memory() and
  
  provides a replacement function openmpt_module_create_from_memory2().
  Detecting libopenmpt 0.3 can be done at build time via the API
  
  version macros provided by libopenmpt. libopenmpt 0.2 did not provide
  
  all required macros, however libopenmpt documents the required #define
  
  shims that can be safely added for libopenmpt 0.2.
  Using openmpt_module_create_from_memory2() instead of
  
  openmpt_module_create_from_memory() avoids the deprecation warning
  
  when building ffmpeg with libopenmpt 0.3.
  openmpt_module_create_from_memory2() provides more fine-grained error
  
  reporting and in particular allows distinguishing out-of-memory from
  
  input file parsing errors. Return appropriate ffmpeg errors
  
  accordingly.
  libopenmpt 0.3 is ABI and API compatible with applications built
  
  against libopenmpt 0.2. Building ffmpeg with libopenmpt 0.2 is still
  
  supported.
  Signed-off-by : Jörn Heusipp <osmanx@problemloesungsmaschine.de>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/libopenmpt.c

• FFmpeg.js Extract images (jpeg/png) from MP4 file

  5 août 2017, par Anuragh27crony

  I’m trying to extract images/frames from a mp4 on client side with the help of ffmpeg.js.

  Equivalent Ffmpeg command :

  ffmpeg -i Sample.mp4 -r 1 output%d.png

  However i could try to create webm file from jpeg files but i couldn’t do the reverse and ends up with following error message

  Unable to find a suitable output format for ’output%d.png’

  Here is the code i’m trying to use.

  var ffmpeg = require("ffmpeg.js/ffmpeg-mp4");
  
  var fs = require("fs");
  
  var stdout = "";
  
  var stderr = "";
  
  
  
  var testData = new Uint8Array(fs.readFileSync("Sample.mp4"));
  
  
  
  var result = ffmpeg({
  
    MEMFS: [{name: "Sample.mp4", data: testData}],
  
    stdin: function() {},
  
    arguments: ["-i", "Sample.mp4","-r","1", "output%d.png"],
  
  });
  
  
  
  console.log(result.MEMFS.length)
  
  if(result.MEMFS.length>0){
  
      var out = result.MEMFS[0].data;
  
      fs.writeFileSync("test.jpg", Buffer(out.data));
  
      }

  Console Output

  ffmpeg version n3.1.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with emcc (Emscripten gcc/clang-like replacement) 1.36.7 ()
  
    configuration: --cc=emcc --enable-cross-compile --target-os=none --arch=x86 --disable-runtime-cpudetect --disable-asm --disable-fast-unaligned --disable-pthreads --disable-w32threads --di
  
  sable-os2threads --disable-debug --disable-stripping --disable-all --enable-ffmpeg --enable-avcodec --enable-avformat --enable-avutil --enable-swresample --enable-swscale --enable-avfilter
  
  --disable-network --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vda --disable-vdpau --enable-decoder=vp8 --enable-decoder=vp9 --enable-decoder=theora --enable-decoder=mpeg2vid
  
  eo --enable-decoder=mpeg4 --enable-decoder=h264 --enable-decoder=hevc --enable-decoder=png --enable-decoder=mjpeg --enable-decoder=vorbis --enable-decoder=opus --enable-decoder=mp3 --enable
  
  -decoder=ac3 --enable-decoder=aac --enable-decoder=ass --enable-decoder=ssa --enable-decoder=srt --enable-decoder=webvtt --enable-demuxer=matroska --enable-demuxer=ogg --enable-demuxer=avi
  
  --enable-demuxer=mov --enable-demuxer=flv --enable-demuxer=mpegps --enable-demuxer=image2 --enable-demuxer=mp3 --enable-demuxer=concat --enable-protocol=file --enable-filter=aresample --ena
  
  ble-filter=scale --enable-filter=crop --enable-filter=overlay --disable-bzlib --disable-iconv --disable-libxcb --disable-lzma --disable-sdl --disable-securetransport --disable-xlib --disabl
  
  e-zlib --enable-encoder=libx264 --enable-encoder=libmp3lame --enable-encoder=aac --enable-muxer=mp4 --enable-muxer=mp3 --enable-muxer=null --enable-gpl --enable-libmp3lame --enable-libx264
  
  --extra-cflags=-I../lame/dist/include --extra-ldflags=-L../lame/dist/lib
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
  [h264 @ 0x809d50] Warning: not compiled with thread support, using thread emulation
  
  [aac @ 0x80e640] Warning: not compiled with thread support, using thread emulation
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Sample.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.56.100
  
    Duration: 00:01:00.00, start: 0.000000, bitrate: 137 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 360x214, 113 kb/s, 1 fps, 1 tbr, 16384 tbn, 32768 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 23 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [NULL @ 0x810d00] Unable to find a suitable output format for 'output%d.png'
  
  output%d.png: Invalid argument

• avfilter/drawbox+drawgrid - add option to prevent overwriting of source pixels

  11 décembre 2017, par Gyan Doshi

  avfilter/drawbox+drawgrid - add option to prevent overwriting of source pixels
  If the user-supplied color in drawbox and drawgrid filters is non-opaque,
  
  the box & grid painting overwrites the input's pixels (including alpha).
  
  Users typically expect the alpha of the specified color to only act as a key
  
  for compositing on top of the main input.
  Added option allows users to select between replacement and composition.
  
  Tested and documented.
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_drawbox.c