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• FFmpeg hangs when using -vsync 1 for libvpx

  31 mars 2014, par user3466413

  I'm trying to transcode a .mov, ultimately generated by GoToMeeting, to a .webm. I've found to get the audio and video in sync for other formats that I need -vsync 1 and encoding at a constant framerate using -r:v 30. This causes FFmpeg to take the input .mov file, which is variable framerate, and transform it to constant framerate at 30 frames per second. In doing so it duplicates frames, but appears to just make many reference frames so the file size doesn't get massive.

  This approach works perfectly fine when encoding using libx264 and aac to a .mp4 container. This makes a file playable in all browsers that support MPEG-4. But, when I encode using using libvpx and libtheora to a .webm container for other browsers, particularly Chrome, FFmpeg just hangs or runs ridiculously slowly. It doesn't respond to pressing Q to abort it, either ; I have to kill the process.

  So, I get output that looks like this :

  user@virtualbox:~/Desktop$ ffmpeg -y -i original.mov -vcodec libvpx -acodec libvorbis -r:v 30 -vsync 1 omgwork.webm
  
  ffmpeg version N-61874-g57e939d Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Mar 27 2014 11:00:31 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
  
    configuration: --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 69.100 / 52. 69.100
  
    libavcodec     55. 55.100 / 55. 55.100
  
    libavformat    55. 35.101 / 55. 35.101
  
    libavdevice    55. 11.100 / 55. 11.100
  
    libavfilter     4.  3.100 /  4.  3.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x254b940] decoding for stream 0 failed
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'original.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2014-03-20 02:09:22
  
    Duration: 03:08:26.72, start: 0.000000, bitrate: 75 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 1368x728 [SAR 1:1 DAR 171:91], 20 kb/s, 0.60 fps, 300 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 47 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Data: none (rtp  / 0x20707472), 6 kb/s
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(und): Data: none (rtp  / 0x20707472), 0 kb/s
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
  [libvpx @ 0x255e460] v1.2.0
  
  Output #0, webm, to 'omgwork.webm':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf55.35.101
  
      Stream #0:0(und): Video: vp8 (libvpx), yuv420p, 1368x728 [SAR 1:1 DAR 171:91], q=-1--1, 200 kb/s, 1k tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: vorbis (libvorbis), 16000 Hz, mono, fltp (default)
  
      Metadata:
  
        creation_time   : 2014-03-20 02:09:22
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> libvpx)
  
    Stream #0:1 -> #0:1 (aac -> libvorbis)
  
  Press [q] to stop, [?] for help
  
  frame=  117 fps= 10 q=0.0 size=       4kB time=00:00:03.90 bitrate=   8.0kbits/s dup=111 drop=0

  Note how it says it's three minutes into transcoding...and it stays there for minutes on end. This video takes only about 10 minutes to completely transcode to MPEG-4 and there is no delay whatsoever from the Press [q] to stop, [?] for help message and to the first progress message. For WebM, the progress message only appears after a few minutes, and then just crawls along so slowly that it would take literally days to complete.

  When this is happening, FFmpeg maxes out all the CPU cores I give it (for example -threads 4 uses all four CPU cores). Aside from making my CPU burst into flames, it doesn't speed things up at all.

  I've tried :

  • Using Windows and Linux. Both do the same thing.
  • Using the latest available Windows binary and compiling FFmpeg from the Git repository. No improvement or change.
  • Using -vsync 0 and -vsync 2. The file does transcode when I do this, but the audio and video remain out of sync just as it did with other formats I tried. -vsync 1 seems absolutely essential for this to work,
  • Searching, and the closest I could find was bug #3208. But, I'm not specifying -fflags at all ; you can see the exact command I'm running.

  Ideas ?

• ffmpeg : Image2 => Error while opening encoder

  22 novembre 2012, par user1844282

  I get the following error ffmpeg.

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4

  I'm pretty sure I've used this exact command before and it's been fine. This is my terminal output. Any help would be appreciated.

  $ ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4
  
  ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Nov 22 2012 17:59:05 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      51. 73.101 / 51. 73.101
  
  
  
    libavcodec     54. 59.100 / 54. 59.100
  
  
  
    libavformat    54. 29.104 / 54. 29.104
  
  
  
    libavdevice    54.  2.101 / 54.  2.101
  
  
  
    libavfilter     3. 17.100 /  3. 17.100
  
  
  
    libswscale      2.  1.101 /  2.  1.101
  
  
  
    libswresample   0. 15.100 /  0. 15.100
  
  
  
    libpostproc    52.  0.100 / 52.  0.100
  
  
  
  Input #0, image2, from '%05d.jpg':
  
    Duration: 00:00:04.44, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libx264 @ 0x7fab0881aa00] width not divisible by 2 (1201x900)
  
  Output #0, mp4, to 'foo.mp4':
  
      Stream #0:0: Video: h264, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], q=-1--1, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• ffmpeg : Image2 => Error while opening encoder

  29 mai 2019, par user1844282

  I get the following error ffmpeg.

  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4

  I’m pretty sure I’ve used this exact command before and it’s been fine. This is my terminal output. Any help would be appreciated.

  $ ffmpeg -f image2 -i %05d.jpg -vcodec libx264 foo.mp4
  
  ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Nov 22 2012 17:59:05 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      51. 73.101 / 51. 73.101
  
  
  
    libavcodec     54. 59.100 / 54. 59.100
  
  
  
    libavformat    54. 29.104 / 54. 29.104
  
  
  
    libavdevice    54.  2.101 / 54.  2.101
  
  
  
    libavfilter     3. 17.100 /  3. 17.100
  
  
  
    libswscale      2.  1.101 /  2.  1.101
  
  
  
    libswresample   0. 15.100 /  0. 15.100
  
  
  
    libpostproc    52.  0.100 / 52.  0.100
  
  
  
  Input #0, image2, from '%05d.jpg':
  
    Duration: 00:00:04.44, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [libx264 @ 0x7fab0881aa00] width not divisible by 2 (1201x900)
  
  Output #0, mp4, to 'foo.mp4':
  
      Stream #0:0: Video: h264, yuvj420p, 1201x900 [SAR 1:1 DAR 1201:900], q=-1--1, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height