[FFmpeg-trac] #2137(avcodec:new): Artefacts in MPEG-4 ASP elementary stream

FFmpeg trac at avcodec.org
Mon Jan 14 23:16:16 CET 2013


#2137: Artefacts in MPEG-4 ASP elementary stream
--------------------------------------+---------------------------------
               Reporter:  cehoyos     |                  Owner:
                   Type:  defect      |                 Status:  new
               Priority:  normal      |              Component:  avcodec
                Version:  git-master  |               Keywords:  asp
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
--------------------------------------+---------------------------------
 I will upload an ASP elementary streams that shows accumulating artefacts
 with ffmpeg, plays fine with mplayer -vc xvid -demuxer lavf (-demuxer
 mpeg4es produces different artefacts).
 {{{
 $ ffmpeg -i tears.m4v -ss 9.65 out.png
 ffmpeg version N-48881-g7980cca Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jan 14 2013 17:11:14 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 14.100 / 52. 14.100
   libavcodec     54. 89.100 / 54. 89.100
   libavformat    54. 59.107 / 54. 59.107
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 32.100 /  3. 32.100
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [m4v @ 0x2bcbde0] Estimating duration from bitrate, this may be inaccurate
 Input #0, m4v, from 'tears.m4v':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: mpeg4, yuv420p, 640x480 [SAR 1:1 DAR 4:3], 29.97
 tbr, 1200k tbn, 30k tbc
 Output #0, image2, to 'out.png':
   Metadata:
     encoder         : Lavf54.59.107
     Stream #0:0: Video: png, rgb24, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200
 kb/s, 90k tbn, 29.97 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg4 -> png)
 Press [q] to stop, [?] for help
 [mpeg4 @ 0x2bbacc0] looks like this file was encoded with
 (divx4/(old)xvid/opendivx) -> forcing low_delay flag
 frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A
 video:474kB audio:0kB subtitle:0 global headers:0kB muxing overhead
 -100.004531%
 }}}
 out.png shows artefacts that can not be seen with 00000290.png:
 $ mplayer tears.m4v -demuxer lavf -vc xvid -vo png

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2137>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list