[FFmpeg-trac] #1337(undetermined:new): MPEG4 ASP does not seek to keyframe

[FFmpeg]

#1337: MPEG4 ASP does not seek to keyframe
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  asp seek
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 (issue 2686)

 out.png shows artefacts, also reproducible with ffplay.
 {{{
 $ ffmpeg -ss 1 -i q_cut.mp4 -vframes 1 out.png
 ffmpeg version N-40924-g349c624 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on May 21 2012 07:59:42 with gcc 4.3.2
   configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
 libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame
 --enable-libtheora --extra-ldflags=-lm
   libavutil      51. 53.100 / 51. 53.100
   libavcodec     54. 21.101 / 54. 21.101
   libavformat    54.  5.101 / 54.  5.101
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 75.100 /  2. 75.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'q_cut.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     creation_time   : 1970-01-01 00:00:00
     encoder         : Lavf53.0.3
   Duration: 00:00:40.00, start: 0.000000, bitrate: 512 kb/s
     Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
 yuv420p, 1024x1024 [SAR 1:1 DAR 1:1], 1142 kb/s, 5 fps, 5 tbr, 5 tbn, 5
 tbc
     Metadata:
       creation_time   : 1970-01-01 00:00:00
       handler_name    : VideoHandler
 [buffer @ 0x8f0bbe0] w:1024 h:1024 pixfmt:yuv420p tb:1/5 sar:1/1
 sws_param:flags=2
 [buffersink @ 0x8f0bec0] No opaque field provided
 [format @ 0x8f0c0c0] auto-inserting filter 'auto-inserted scaler 0'
 between the filter 'src' and the filter 'format'
 [scale @ 0x8f06ec0] w:1024 h:1024 fmt:yuv420p sar:1/1 -> w:1024 h:1024
 fmt:rgb24 sar:1/1 flags:0x4
 Output #0, image2, to 'out.png':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     creation_time   : 1970-01-01 00:00:00
     encoder         : Lavf54.5.101
     Stream #0:0(und): Video: png, rgb24, 1024x1024 [SAR 1:1 DAR 1:1],
 q=2-31, 200 kb/s, 90k tbn, 5 tbc
     Metadata:
       creation_time   : 1970-01-01 00:00:00
       handler_name    : VideoHandler
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg4 -> png)
 Press [q] to stop, [?] for help
 [mpeg4 @ 0x8f12d00] warning: first frame is no keyframe
 frame=    1 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.20 bitrate=
 0.0kbits/s
 video:262kB audio:0kB global headers:0kB muxing overhead -100.000000%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1337>
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