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[Bug 1191046] Re: Avconv silently ignores (incorrect) -preset option

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This bug does not occur in any release version of libav.

** Changed in: libav (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1191046

Title:
  Avconv silently ignores (incorrect) -preset option

Status in “libav” package in Ubuntu:
  Fix Released

Bug description:
  Apparently avconv silently ignores a "-preset" option passed to it on
  the command-line. The correct option for passing a preset file is
  -pre, but -preset behaves differently from other incorrect options, as
  no error message is output and the avconv command is executed if
  otherwise valid. Not erroring out on erroneous usage is confusing,
  particularly with presets, as the output also does not specifically
  say when a preset *is* being applied (you have to deduce it from the
  data). Unless -preset is currently being used as a placeholder in the
  source, I suggest it be made to error out as other incorrect options
  do.

  I'm pasting output from five demonstration runs below. 1) is an
  example of correct usage of -pre, 2) of correct usage of -pre with
  non-existing preset, 3) of trying to use a non-existing option -asdf,
  and 4) of using -preset in place of -pre, one run with an existing and
  one with a non-existing preset name.

  1) Correct usage of -pre, as indicated by "q=0-63" (which gets read
  from /usr/share/avconv/libvpx-360p.avpreset):

  jani@saegusa:avconv-preset-test$ avconv -y -i input.mpeg -c:v libvpx -pre libvpx-360p -an -t 1 out.webm
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  [mpeg @ 0x1bae9c0] max_analyze_duration reached
  Input #0, mpeg, from 'input.mpeg':
    Duration: 01:43:01.65, start: 0.184656, bitrate: 2632 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3], 1844 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  [buffer @ 0x1bb0060] w:720 h:576 pixfmt:yuv420p
  [libvpx @ 0x1baf380] v1.0.0
  Output #0, webm, to 'out.webm':
    Metadata:
      encoder         : Lavf53.21.1
      Stream #0.0: Video: libvpx, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=0-63, 768 kb/s, 1k tbn, 25 tbc
  Stream mapping:
    Stream #0:0 -> #0:0 (mpeg2video -> libvpx)
  Press ctrl-c to stop encoding
  frame=   25 fps= 13 q=0.0 Lsize=      95kB time=1.00 bitrate= 778.2kbits/s    
  video:94kB audio:0kB global headers:0kB muxing overhead 0.681033%

  2) Correct usage of -pre with non-existing preset, as indicated by
  "could not be opened" error message:

  jani@saegusa:avconv-preset-test$ avconv -y -i input.mpeg -c:v libvpx -pre xlibvpx-360p -an -t 1 out.webm
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  [mpeg @ 0x8f99c0] max_analyze_duration reached
  Input #0, mpeg, from 'input.mpeg':
    Duration: 01:43:01.65, start: 0.184656, bitrate: 2632 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3], 1844 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  Preset xlibvpx-360p specified for stream 0:0, but could not be opened.

  3) Trying to use non-existing option -asdf, as indicated by
  "Unrecognized option" error message:

  jani@saegusa:avconv-preset-test$ avconv -y -i input.mpeg -c:v libvpx -asdf libvpx-360p -an -t 1 out.webm
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  [mpeg @ 0x6829c0] max_analyze_duration reached
  Input #0, mpeg, from 'input.mpeg':
    Duration: 01:43:01.65, start: 0.184656, bitrate: 2632 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3], 1844 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  Unrecognized option 'asdf'
  Failed to set value 'libvpx-360p' for option 'asdf'

  4) Now, using -preset instead of -pre, regardless of validity of the
  parameter passed to it, the preset specified is not loaded, as
  indicated by "q=-1--1", but no "Unrecognized option" error occurs:

  jani@saegusa:avconv-preset-test$ avconv -y -i input.mpeg -c:v libvpx -preset libvpx-360p -an -t 1 out.webm
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  [mpeg @ 0xbe69c0] max_analyze_duration reached
  Input #0, mpeg, from 'input.mpeg':
    Duration: 01:43:01.65, start: 0.184656, bitrate: 2632 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3], 1844 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  [buffer @ 0xbeef60] w:720 h:576 pixfmt:yuv420p
  [libvpx @ 0xbe7380] v1.0.0
  Output #0, webm, to 'out.webm':
    Metadata:
      encoder         : Lavf53.21.1
      Stream #0.0: Video: libvpx, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=-1--1, 200 kb/s, 1k tbn, 25 tbc
  Stream mapping:
    Stream #0:0 -> #0:0 (mpeg2video -> libvpx)
  Press ctrl-c to stop encoding
  frame=   25 fps= 17 q=0.0 Lsize=      25kB time=1.00 bitrate= 208.2kbits/s    
  video:25kB audio:0kB global headers:0kB muxing overhead 2.589469%

  jani@saegusa:avconv-preset-test$ avconv -y -i input.mpeg -c:v libvpx -preset xlibvpx-360p -an -t 1 out.webm
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  [mpeg @ 0x163a9c0] max_analyze_duration reached
  Input #0, mpeg, from 'input.mpeg':
    Duration: 01:43:01.65, start: 0.184656, bitrate: 2632 kb/s
      Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 16:15 DAR 4:3], 1844 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
      Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16, 224 kb/s
  [buffer @ 0x1642f60] w:720 h:576 pixfmt:yuv420p
  [libvpx @ 0x163b380] v1.0.0
  Output #0, webm, to 'out.webm':
    Metadata:
      encoder         : Lavf53.21.1
      Stream #0.0: Video: libvpx, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=-1--1, 200 kb/s, 1k tbn, 25 tbc
  Stream mapping:
    Stream #0:0 -> #0:0 (mpeg2video -> libvpx)
  Press ctrl-c to stop encoding
  frame=   25 fps= 17 q=0.0 Lsize=      25kB time=1.00 bitrate= 208.2kbits/s    
  video:25kB audio:0kB global headers:0kB muxing overhead 2.589469%

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libav-tools 4:0.8.6-0ubuntu0.12.04.1
  ProcVersionSignature: Ubuntu 3.5.0-34.55~precise1-generic 3.5.7.13
  Uname: Linux 3.5.0-34-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.3
  Architecture: amd64
  CheckboxSubmission: 09ae689090491ca53449589269e4bfd8
  CheckboxSystem: edda5d4f616ca792bf437989cb597002
  Date: Fri Jun 14 19:00:44 2013
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MarkForUpload: True
  SourcePackage: libav
  UpgradeStatus: Upgraded to precise on 2011-11-21 (571 days ago)

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