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• 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

• ffmpeg producing empty MP4 files

  3 mai 2017, par Joshua Dowell

  I am trying to use ffmpeg to convert MTS files to MP4 files. It seems as though the command is running correctly, but the resulting files end up being empty.

  joshua@joshua-VirtualBox:~$ ffmpeg -i /media/sf_2017-04/SD_044/00007.MTS /media/sf_2017-04/SD_04/000007.mp4
  
  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.2, Copyright (c) 2000-2014 the Libav developers
  
    built on Apr  1 2016 14:28:02 with gcc 4.6.3
  
  The ffmpeg program is only provided for script compatibility and will be removed
  
  in a future release. It has been deprecated in the Libav project to allow for
  
  incompatible command line syntax improvements in its replacement called avconv
  
  (see Changelog for details). Please use avconv instead.
  
  Input #0, mpegts, from '/media/sf_2017-04/SD_044/00007.MTS':
  
    Duration: 00:01:17.07, start: 1.927822, bitrate: 25053 kb/s
  
    Program 1 
  
      Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 59.96 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
  
      Stream #0.2[0x1200]: Data: [144][0][0][0] / 0x0090
  
  File '/media/sf_2017-04/SD_04/000007.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x88772a0] w:1920 h:1080 pixfmt:yuv420p
  
  ffmpeg -i /media/sf_2017-04/SD_044/00007.MTS /media/sf_2017-04/SD_04/000007.mp4
  
  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.2, Copyright (c) 2000-2014 the Libav developers
  
    built on Apr  1 2016 14:28:02 with gcc 4.6.3
  
  The ffmpeg program is only provided for script compatibility and will be removed
  
  in a future release. It has been deprecated in the Libav project to allow for
  
  incompatible command line syntax improvements in its replacement called avconv
  
  (see Changelog for details). Please use avconv instead.
  
  Input #0, mpegts, from '/media/sf_2017-04/SD_044/00007.MTS':
  
    Duration: 00:01:17.07, start: 1.927822, bitrate: 25053 kb/s
  
    Program 1 
  
      Stream #0.0[0x1011]: Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 59.96 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
      Stream #0.1[0x1100]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
  
      Stream #0.2[0x1200]: Data: [144][0][0][0] / 0x0090
  
  File '/media/sf_2017-04/SD_04/000007.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x88772a0] w:1920 h:1080 pixfmt:yuv420p
  
  encoder 'aac' is experimental and might produce bad results.
  
  Add '-strict experimental' if you want to use it.