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• FFMPEG conversion to MXF [closed]

  16 février 2012, par MFB

  I have to wrap an MPEG2 video file in an MXF container and convert the audio in the process. I have the MXF wrapping working but it won't convert the audio stream (which needs to be 16bit, 48kHz Linear PCM).

  Here's what I'm trying :

  ffmpeg -i input.mpg -map 0:0 -map 0:1 -vcodec copy -f mpeg2video -acodec pcm_s16le -ar 48000 -ac 2 output.mxf

  Results :

  ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan 30 2012 17:49:23 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
  
    configuration: *{snipped}*
  
  runtime-cpudetect
  
    libavutil      51. 34.101 / 51. 34.101
  
    libavcodec     53. 60.100 / 53. 60.100
  
    libavformat    53. 31.100 / 53. 31.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 60.100 /  2. 60.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [mpeg @ 0x10201ae00] max_analyze_duration 5000000 reached at 5000000
  
  Input #0, mpeg, from '/Volumes/Extra/test.mpg':
  
    Duration: 00:00:59.97, start: 0.192911, bitrate: 6513 kb/s
  
      Stream #0:0[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 12000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Output #0, mpeg2video, to 'video.mxf':
  
    Metadata:
  
      encoder         : Lavf53.31.100
  
      Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 12000 kb/s, 25 fps, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 1500 fps=  0 q=-1.0 Lsize=   43949kB time=00:00:59.96 bitrate=6004.6kbits/s    
  
  video:43949kB audio:0kB global headers:0kB muxing overhead 0.000000%

  The video plays fine as the MXF, but there is no audio stream at all. Any help would be great.

• How do I debug why avconv is stalling ?

  9 juillet 2015, par Ecommerce Consultant

  I’m converting .mov files to .mpg files using avconv. The command being run by my php application is as follows :

  avconv -y -i ’$finalvideo’ -target ntsc-dvd -aspect 4:3 ’$mpgvideo’ > $logs

  I’m able to convert small .mov files to .mpg without any problems. However, I’m unable to convert videos that are over ten or fifteen minutes long. The log file is completely empty. When I run the command directly the frame stops somewhere around 34000 no matter which video I pick.

  The cpu shows 97% usage on this process, however, nothing is happening.

  OS Ubuntu 10 

  How can I gather more information about this stalled process ?

  Here’s the frozen output

  avconv version 0.7, Copyright (c) 2000-2011 the Libav developers
  
    built on Nov  3 2011 13:39:09 with gcc 4.3.3
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 23.98 (24000/1001)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/sites/default/files/compiled_videos/573-stream.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.0.3
  
    Duration: 00:18:53.49, start: 0.000000, bitrate: 1430 kb/s
  
      Stream #0.0(eng): Video: h264 (Main), yuv420p, 854x480, 1387 kb/s, 25.60 fps, 23.98 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 126 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  [buffer @ 0x9d88820] w:854 h:480 pixfmt:yuv420p
  
  [scale @ 0x9d88b60] w:854 h:480 fmt:yuv420p -> w:720 h:480 fmt:yuv420p flags:0x4
  
  Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
  
  Output #0, dvd, to '/var/www/sites/default/files/compiled_videos/573.mpg':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.10.0
  
      Stream #0.0(eng): Video: mpeg2video, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 6000 kb/s, 90k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(eng): Audio: ac3, 48000 Hz, stereo, flt, 448 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0 (h264 -> mpeg2video)
  
    Stream #0.1 -> #0.1 (aac -> ac3)
  
  Press ctrl-c to stop encoding
  
  [mpeg2video @ 0x9d8bf20] rc buffer underflow
  
  Input stream #0.1 frame changed from rate:48000 fmt:s16 ch:2 to rate:48000 fmt:flt ch:2
  
  frame=33910 fps= 91 q=2.0 size=  151922kB time=336.58 bitrate=3697.7kbits/s dup=5475 drop=530    

  Oh interesting. I used -loglevel debug -debug. I was seeing this information

  stream #0:
  
    keyframe=0
  
    duration=0.000
  
    dts=1133.449  pts=1133.533
  
    size=103
  
  *** 1 dup!
  
  stream #0:
  
    keyframe=0
  
    duration=0.000
  
    dts=1133.449  pts=1133.449
  
    size=104

  Until I finally received this message

  *** drop!

  I have posted my bug with libav
  http://bugzilla.libav.org/show_bug.cgi?id=67

  thanks for your help.

• Anomalie #2653 (Fermé) : Mauvaise redirection sur forum interne

  18 avril 2012, par cedric -

  corrigé par http://zone.spip.org/trac/spip-zone/changeset/60474