[FFmpeg-trac] #1329(undetermined:open): A/V desync with mpeg1video and mp2 in mpeg-ps (was: Re: ffmpeg Que input is backward in time)

[FFmpeg]

#1329: A/V desync with mpeg1video and mp2 in mpeg-ps
-------------------------------------+-------------------------------------
             Reporter:  burek        |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  mpegps       |               Resolution:
  desync                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => mpegps desync
 * status:  new => open
 * version:  unspecified => git-master
 * reproduced:  0 => 1


Comment:

 Sample uploaded to samples/ffmpeg-bugs/trac/ticket1329

 Without -async 1, the resulting file is very heavily out-of-sync, with
 -async 1, small desync is still visible imo after 30 seconds, not a
 regression afaict.
 Seeking does not work for the sample, works fine with MPlayer.
 {{{
 $ ffmpeg -async 1 -i invalid_cliping_on_screen_but_encodes_finishes.mpg
 -q:v 2 -strict experimental out.mp4
 ffmpeg version N-41352-gc8a1101 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Jun  6 2012 07:55:08 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 --enable-libvpx --enable-libxavs
   libavutil      51. 56.100 / 51. 56.100
   libavcodec     54. 25.100 / 54. 25.100
   libavformat    54.  6.101 / 54.  6.101
   libavdevice    54.  0.100 / 54.  0.100
   libavfilter     2. 78.100 /  2. 78.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 15.100 /  0. 15.100
   libpostproc    52.  0.100 / 52.  0.100
 [mpeg @ 0x90143c0] max_analyze_duration 5000000 reached at 5015467
 Input #0, mpeg, from 'invalid_cliping_on_screen_but_encodes_finishes.mpg':
   Duration: 26:31:34.47, start: 0.620000, bitrate: 0 kb/s
     Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR
 4:3], 1452 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
     Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, stereo, s16, 128 kb/s
 [buffer @ 0x901c620] w:640 h:480 pixfmt:yuv420p tb:1/90000 sar:1/1
 sws_param:flags=2
 [ffmpeg_buffersink @ 0x901c580] No opaque field provided
 -async is forwarded to lavfi similarly to -af
 aresample=min_comp=0.001:min_hard_comp=0.100000.
 [aresample @ 0x9015760] chl:stereo fmt:s16 r:44100Hz -> chl:stereo fmt:flt
 r:44100Hz
 Output #0, mp4, to 'out.mp4':
   Metadata:
     encoder         : Lavf54.6.101
     Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 640x480 [SAR
 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
     Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo,
 flt, 128 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg1video -> mpeg4)
   Stream #0:1 -> #0:1 (mp2 -> aac)
 Press [q] to stop, [?] for help
 frame= 1279 fps= 65 q=2.0 Lsize=   23874kB time=00:00:51.16
 bitrate=3822.8kbits/s dup=3 drop=0
 video:23092kB audio:748kB global headers:0kB muxing overhead 0.141022%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1329#comment:5>
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