[FFmpeg-trac] #4552(avformat:new): Broken timestamps for msmpeg4v2 in avi
FFmpeg
trac at avcodec.org
Tue May 12 23:35:34 CEST 2015
#4552: Broken timestamps for msmpeg4v2 in avi
-------------------------------------+-------------------------------------
Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: important | Component: avformat
Version: git- | Keywords: avi msmpeg4
master | dts regression
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
-------------------------------------+-------------------------------------
A user uploaded a sample for which bad timestamps are produced since
ae8168074eb1c8230d9c6482102ca08a70a9c4b0 - possibly related to ticket
#4042.
{{{
$ ffmpeg -i A-223555-223610-00324.avi -qscale 2 out.avi
ffmpeg version N-72081-gec38a1b Copyright (c) 2000-2015 the FFmpeg
developers
built with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 38.101 / 56. 38.101
libavformat 56. 33.101 / 56. 33.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
[avi @ 0x1c56320] non-interleaved AVI
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, avi, from 'A-223555-223610-00324.avi':
Duration: 00:00:15.04, start: 0.000000, bitrate: 837 kb/s
Stream #0:0: Video: msmpeg4v2 (MP42 / 0x3234504D), yuv420p, 384x288,
763 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 8000 Hz, 1
channels, u8, 64 kb/s
Please use -q:a or -q:v, -qscale is ambiguous
Output #0, avi, to 'out.avi':
Metadata:
ISFT : Lavf56.33.101
Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 384x288,
q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc56.38.101 mpeg4
Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 8000 Hz, mono, fltp, 96
kb/s
Metadata:
encoder : Lavc56.38.101 ac3
Stream mapping:
Stream #0:0 -> #0:0 (msmpeg4v2 (native) -> mpeg4 (native))
Stream #0:1 -> #0:1 (pcm_u8 (native) -> ac3 (native))
Press [q] to stop, [?] for help
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 2,
current: 0; changing to 3. This may result in incorrect timestamps in the
output file.
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 3,
current: 0; changing to 4. This may result in incorrect timestamps in the
output file.
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 4,
current: 0; changing to 5. This may result in incorrect timestamps in the
output file.
...
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 74,
current: 0; changing to 75. This may result in incorrect timestamps in the
output file.
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 75,
current: 0; changing to 76. This may result in incorrect timestamps in the
output file.
[avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 76,
current: 0; changing to 77. This may result in incorrect timestamps in the
output file.
frame= 324 fps=0.0 q=2.0 Lsize= 4146kB time=00:00:15.04
bitrate=2258.4kbits/s
video:3950kB audio:176kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.496279%
}}}
Playing the file with FFplay leads to heavy A/V desync.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/4552>
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