[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
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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>
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