[FFmpeg-trac] #2574(avcodec:new): Uneven speed when reencoding mpeg program stream
FFmpeg
trac at avcodec.org
Wed May 15 17:46:15 CEST 2013
#2574: Uneven speed when reencoding mpeg program stream
-------------------------------------+-------------------------------------
Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: important | Component: avcodec
Version: git- | Keywords: mpeg2video
master | regression
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
-------------------------------------+-------------------------------------
http://thread.gmane.org/gmane.comp.video.ffmpeg.user/45738
A user uploaded a sample that reencodes into a file with uneven speed with
ffmpeg and shows uneven playback with ffplay and mplayer -vc ffmpeg12,
plays fine with mplayer -vc mpeg12
This is a regression since 0127b86
{{{
$ ffmpeg -i BAGUTTI\ CAREZZE_cut.mpg -qscale 2 -t 7 out.avi
ffmpeg version N-53092-gc45b823 Copyright (c) 2000-2013 the FFmpeg
developers
built on May 15 2013 17:44:48 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --disable-indev=jack
libavutil 52. 32.100 / 52. 32.100
libavcodec 55. 9.100 / 55. 9.100
libavformat 55. 7.100 / 55. 7.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 67.100 / 3. 67.100
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Input #0, mpeg, from 'BAGUTTI CAREZZE_cut.mpg':
Duration: 00:00:07.28, start: 0.168444, bitrate: 8439 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
Stream #0:1[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s
Please use -q:a or -q:v, -qscale is ambiguous
Output #0, avi, to 'out.avi':
Metadata:
ISFT : Lavf55.7.100
Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x576 [SAR
16:15 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
192 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video -> mpeg4)
Stream #0:1 -> #0:1 (mp2 -> ac3)
Press [q] to stop, [?] for help
frame= 171 fps=0.0 q=2.0 Lsize= 5954kB time=00:00:07.00
bitrate=6960.2kbits/s
video:5771kB audio:164kB subtitle:0 global headers:0kB muxing overhead
0.321262%
}}}
out.avi "pauses" for a moment after four seconds.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2574>
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