[FFmpeg-trac] #1337(undetermined:new): MPEG4 ASP does not seek to keyframe
FFmpeg
trac at avcodec.org
Mon May 21 13:07:31 CEST 2012
#1337: MPEG4 ASP does not seek to keyframe
-------------------------------------+-------------------------------------
Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: git- | undetermined
master | Keywords: asp seek
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
-------------------------------------+-------------------------------------
(issue 2686)
out.png shows artefacts, also reproducible with ffplay.
{{{
$ ffmpeg -ss 1 -i q_cut.mp4 -vframes 1 out.png
ffmpeg version N-40924-g349c624 Copyright (c) 2000-2012 the FFmpeg
developers
built on May 21 2012 07:59:42 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
libavutil 51. 53.100 / 51. 53.100
libavcodec 54. 21.101 / 54. 21.101
libavformat 54. 5.101 / 54. 5.101
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 75.100 / 2. 75.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'q_cut.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
creation_time : 1970-01-01 00:00:00
encoder : Lavf53.0.3
Duration: 00:00:40.00, start: 0.000000, bitrate: 512 kb/s
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
yuv420p, 1024x1024 [SAR 1:1 DAR 1:1], 1142 kb/s, 5 fps, 5 tbr, 5 tbn, 5
tbc
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
[buffer @ 0x8f0bbe0] w:1024 h:1024 pixfmt:yuv420p tb:1/5 sar:1/1
sws_param:flags=2
[buffersink @ 0x8f0bec0] No opaque field provided
[format @ 0x8f0c0c0] auto-inserting filter 'auto-inserted scaler 0'
between the filter 'src' and the filter 'format'
[scale @ 0x8f06ec0] w:1024 h:1024 fmt:yuv420p sar:1/1 -> w:1024 h:1024
fmt:rgb24 sar:1/1 flags:0x4
Output #0, image2, to 'out.png':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
creation_time : 1970-01-01 00:00:00
encoder : Lavf54.5.101
Stream #0:0(und): Video: png, rgb24, 1024x1024 [SAR 1:1 DAR 1:1],
q=2-31, 200 kb/s, 90k tbn, 5 tbc
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 -> png)
Press [q] to stop, [?] for help
[mpeg4 @ 0x8f12d00] warning: first frame is no keyframe
frame= 1 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.20 bitrate=
0.0kbits/s
video:262kB audio:0kB global headers:0kB muxing overhead -100.000000%
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1337>
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