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• 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

• 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

• win32_dlfcn : Support WinRT/UWP.

  1er juillet 2017, par Matt Oliver

  win32_dlfcn : Support WinRT/UWP.
  This only enables dlls that are packaged with the application to be
  
  loaded. Due to the limitations of WinRT/UWP it is not allowed to load
  
  external/system dlls so this cannot be used as a complete replacement
  
  for normal win32 dll loading.
  Signed-off-by : Matt Oliver <protogonoi@gmail.com>
  

  • [DH] compat/w32dlfcn.h