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• Avconv / FFmpeg - VOB to mp4

  26 septembre 2017, par 0ne_Up

  I am using avconv/ffmpeg to convert VOB files copied from a DVD to mp4. The command I’m using is

  avconv -i "concat:1.VOB|2.VOB|3.VOB|4.VOB|5.VOB" -c:v libx264 -crf 28 -c:a libvo_aacenc -b:a 128k output.mp4

  This is working, but I’ve seen many different commands using different kinds of arguments, and I’m wondering if this is the "right" way to do it, and if someone has suggestions about which arguments I should (not) use and why (not). The file should be compatible with mobile devices and smart TV’s. I’ve also seen "libmp3lame" being used as audio codec, is it better to use AAC or MP3 ?

  The file size is 732.6MB for a video lasting 00:58:37, is this reasonable ?
  Maybe I can use something to reduce the filesize further without too much quality loss ?

  I’m also confused about the difference between Avconv and FFmpeg. I thought that FFmpeg is deprecated and Avconv is "newer and better", I have two installations of Linux Mint, when I run "avconv —help" on a 17.1 installations I see

  avconv version 9.20-6:9.20-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers

  And when I run the same command on a 18.1 installation I see

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers

  Is avconv newer than ffmpeg or is it just a different name for the same thing ?

• ffmpeg fails to capture desktop when UAC prompt appears

  12 juillet 2019, par kristin

  I am trying to stream desktop to .avi file using ffmpeg static version 3.2.4 from https://ffmpeg.zeranoe.com/builds/, but streaming fails when UAC prompt appears.

  Command line that I am trying to use :

   ffmpeg.exe -f gdigrab -analyzeduration 100M -probesize 100M -i desktop -framerate 10 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -x264opts crf=23 -r 10 ".avi"

  Output that I got :

    ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-d3d11va --enable-dxva2
  
  --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontcon
  
  fig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libb
  
  luray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --e
  
  nable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-l
  
  ibopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libope
  
  njpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --en
  
  able-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enabl
  
  e-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable
  
  -libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --e
  
  nable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [gdigrab @ 00000000003684a0] Capturing whole desktop as 1654x927x32 at (0,0)
  
  Input #0, gdigrab, from 'desktop':
  
    Duration: N/A, start: 1494400135.425894, bitrate: 1470470 kb/s
  
      Stream #0:0: Video: bmp, bgra, 1654x927, 1470470 kb/s, 29.97 fps, 1000k tbr,
  
   1000k tbn, 1000k tbc
  
  [libx264 @ 000000000036b3e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  AVX
  
  [libx264 @ 000000000036b3e0] profile Constrained Baseline, level 4.0
  
  Output #0, avi, to 'C:\New folder\test.avi':
  
    Metadata:
  
      ISFT            : Lavf57.56.101
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1654x926, q
  
  =-1--1, 10 fps, 10 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=   12 fps=0.0 q=0.0 size=       6kB time=00:00:00.00 bitrate=N/A dup=0 dro
  
  frame=   18 fps= 17 q=12.0 size=     309kB time=00:00:00.50 bitrate=5067.3kbits/
  
  frame=   23 fps= 15 q=14.0 size=     624kB time=00:00:01.00 bitrate=5113.2kbits/
  
  frame=   29 fps= 12 q=13.0 size=     757kB time=00:00:01.60 bitrate=3877.8kbits/
  
  frame=   35 fps= 12 q=12.0 size=     849kB time=00:00:02.20 bitrate=3161.9kbits/
  
  frame=   40 fps= 12 q=15.0 size=     914kB time=00:00:02.70 bitrate=2771.9kbits/
  
  frame=   44 fps= 11 q=17.0 size=     992kB time=00:00:03.20 bitrate=2538.6kbits/
  
  frame=   49 fps= 11 q=11.0 size=    1069kB time=00:00:03.70 bitrate=2366.7kbits/
  
  frame=   55 fps= 11 q=11.0 size=    1186kB time=00:00:04.40 bitrate=2207.5kbits/
  
  [gdigrab @ 00000000003684a0] Failed to capture image (error 5)
  
  desktop: I/O error
  
  frame=   59 fps= 10 q=10.0 size=    1197kB time=00:00:04.80 bitrate=2043.4kbits/
  
  frame=   59 fps= 10 q=-1.0 Lsize=    1220kB time=00:00:06.10 bitrate=1638.6kbits
  
  /s dup=0 drop=99 speed=1.04x
  
  video:1213kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
  
  overhead: 0.577492%
  
  [libx264 @ 000000000036b3e0] frame I:1     Avg QP:20.00  size:249076
  
  [libx264 @ 000000000036b3e0] frame P:58    Avg QP:13.95  size: 17124
  
  [libx264 @ 000000000036b3e0] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 000000000036b3e0] mb P  I16..4:  1.8%  0.0%  0.0%  P16..4: 14.1%  0.0
  
  %  0.0%  0.0%  0.0%    skip:84.2%
  
  [libx264 @ 000000000036b3e0] coded y,uvDC,uvAC intra: 31.5% 13.5% 12.4% inter: 7
  
  .7% 2.1% 1.5%
  
  [libx264 @ 000000000036b3e0] i16 v,h,dc,p: 72% 25%  2%  1%
  
  [libx264 @ 000000000036b3e0] i8c dc,h,v,p: 71% 16% 12%  0%
  
  [libx264 @ 000000000036b3e0] kb/s:1629.20

  In output can see message :

  [gdigrab @ 00000000003684a0] Failed to capture image (error 5)
  
  desktop: I/O error

  this is written to output when UAC prompt appears.

  Am I doing something wrong or missing in command line ?
  Have to stream desktop using ffmpeg and don`t fail when UAC prompt appears ?

• ffmpeg throws error while converting wav to flac

  24 août 2017, par user3815252

  I am working on a research project and it requires me to first record audios from browser (using getuserMedia) and save them in a wav format. My code looks like this :

  navigator.mediaDevices.getUserMedia({ audio: true }).then(stream => {
  
          const chunks = [];
  
          const recorder = new MediaRecorder(stream);
  
          recorder.ondataavailable = e => {
  
              chunks.push(e.data);
  
              if (recorder.state == 'inactive') {
  
                  $scope.blob = new Blob(chunks, { type: 'audio/wav' });
  
                  $scope.file = new File([$scope.blob], "myFile.wav", {type: 'audio/wav', lastModified: Date.now()});
  
  
  
                  $scope.blobUrl = URL.createObjectURL($scope.blob);
  
                  createAudioElement($scope.blobUrl);
  
              }
  
          };
  
          recorder.start(1000);
  
          $scope.stop = function() {
  
              recorder.stop();    
  
          };
  
  
  
      }).catch(console.error);

  After saving $scope.file on filesystem, I convert it to flac format using ffmpeg utility ([https://www.ffmpeg.org/).

  Now my problem is the ffmpeg tool sometimes gives me error saying that this file cannot be recognized as wav file. The exact output of ffmpeg tool is :

    ffmpeg-user: Wav to Flac conversion: Invalid data found when processing input
  
  
  
    ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers 
  
    built with Apple LLVM version 7.0.2 (clang-700.1.81) 
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.3.3 --enable-shared 
  
    --enable-pthreads --enable-gpl --enable-version3 
  
    --enable-hardcoded-tables 
  
    --enable-avresample --cc=clang --host-cflags= --host-ldflags= 
  
    --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl 
  
  
  
    --disable-lzma --enable-vda 
  
    libavutil      55. 58.100 / 55. 58.100 
  
    libavcodec     57. 89.100 / 57. 89.100 
  
    libavformat    57. 71.100 / 57. 71.100 
  
    libavdevice    57.  6.100 / 57.  6.100 
  
    libavfilter     6. 82.100 /  6. 82.100 
  
    libavresample   3.  5.  0 /  3.  5.  0 
  
    libswscale      4.  6.100 /  4.  6.100 
  
    libswresample   2.  7.100 /  2.  7.100 
  
    libpostproc    54.  5.100 / 54.  5.100 

  Does anyone know why am I getting this error ?