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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 ?

• In FFMpeg Ubuntu “rtmp ://url live=1” not working

  13 juillet 2015, par Yuvraj Kakkar

  Trying to excute following ffmpeg command in ubuntu.

  *ffmpeg -i "rtmp://IP/live/1234 live=1" -f flv rtmp://IP/live/1234_56 *

  ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr  8 2014 13:15:21 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=/home/encoder/ffmpeg_build --extra-cflags=-I/home/encoder/ffmpeg_build/include --extra-ldflags=-L/home/encoder/ffmpeg_build/lib --bindir=/home/encoder/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 74.100 / 52. 74.100
  
    libavcodec     55. 58.102 / 55. 58.102
  
    libavformat    55. 36.102 / 55. 36.102
  
    libavdevice    55. 11.100 / 55. 11.100
  
    libavfilter     4.  3.100 /  4.  3.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [rtmp @ 0x3c5a140] Detected librtmp style URL parameters, these aren't supported by the libavformat internal RTMP handler currently enabled. See the documentation for the correct way to pass parameters.
  
  ^C[flv @ 0x3c59b00] Could not find codec parameters for stream 0 (Video: none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [flv @ 0x3c59b00] Could not find codec parameters for stream 1 (Audio: none, 0 channels): unspecified sample format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  rtmp://IP/live/1234 live=1: could not find codec parameters
  
  Received signal 2: terminating.

  I have installed avserver (Libav) earlier to ffmpeg.Kindly suggest any alternative to live=1 or provide suggstion.

• ffmpeg extracts about 30 sec of audio and stops [on hold]

  30 mars 2014, par user2957951

  I'm trying to extract audio from an mp4 video stream. I use ffmpeg but it seems to stop after about 30 sec or so ! Ideally, I'd like to extract the audio as mp3, but ffmpeg crashes if I specify .mp3 as the file extension.

  Stream : http://vimeo.com/82975217

  Here is the command I use and the output I get :

  c:\>ffmpeg -i "http://av.vimeo.com/23628/941/105695865.mp4?token2=1396166650_12b
  
  05b5c828c98a2feec82fa76230f64&aksessionid=c18fdc4c061823af&ns=4" -vn -acodec cop
  
  y audiofile1.aac
  
  ffmpeg version N-59742-gd9481dc Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan  9 2014 22:04:35 with gcc 4.8.2 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3
  
   --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --ena
  
  ble-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --e
  
  nable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-lib
  
  modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
  
  r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
  
  able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
  
   --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil      52. 62.100 / 52. 62.100
  
    libavcodec     55. 47.101 / 55. 47.101
  
    libavformat    55. 22.103 / 55. 22.103
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://av.vimeo.com/23628/941/105695865
  
  .mp4?token2=1396166650_12b05b5c828c98a2feec82fa76230f64&aksessionid=c18fdc4c0618
  
  23af&ns=4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2012-06-29 21:30:28
  
    Duration: 01:05:34.86, start: 0.000000, bitrate: 594 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [
  
  SAR 1:1 DAR 16:9], 490 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 2012-06-29 21:30:28
  
        handler_name    : GPAC ISO Video Handler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 99
  
   kb/s (default)
  
      Metadata:
  
        creation_time   : 2012-06-29 21:30:32
  
        handler_name    : GPAC ISO Audio Handler
  
  Output #0, adts, to 'audiofile1.aac':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      encoder         : Lavf55.22.103
  
      Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, 99 kb/s
  
  (default)
  
      Metadata:
  
        creation_time   : 2012-06-29 21:30:32
  
        handler_name    : GPAC ISO Audio Handler
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  size=     344kB time=00:00:27.02 bitrate= 104.2kbits/s

  As you can see it just hangs after extracting the 1st 20-30 sec, and after about min or so, the window shuts down !

  Note : That extracting video (i.e. mp4 works great, but audio does not)

  Your help/insight are much appreciated !

  Cheers !