[FFmpeg-trac] #6991(avcodec:open): incorrect frame readout after seek
FFmpeg
trac at avcodec.org
Mon Jan 29 12:23:25 EET 2018
#6991: incorrect frame readout after seek
-------------------------------------+-------------------------------------
Reporter: hxuanyu | Owner:
Type: defect | Status: open
Priority: important | Component: avcodec
Version: git-master | Resolution:
Keywords: h264 | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Changes (by cehoyos):
* status: new => open
* reproduced: 0 => 1
* component: undetermined => avcodec
* priority: normal => important
* version: unspecified => git-master
* keywords: => h264 regression
Comment:
For future tickets:
Do not report issues against `ffplay` if they are reproducible with
`ffmpeg`.
Always provide the command line you tested together with the complete,
uncut console output.
Originally broken in 9e5ef1c5c37208326c59d642e2dc7afd3f10b09b (needs
`-flags2 +showall`), partly fixed in
e3d7a3978b857e32b32575ff78ecc7d67a18687e (related to ticket #3186).
{{{
$ ffmpeg -ss 5 -i clipcanvas_14348_offline.mp4 -qscale 2 -an out.avi
ffmpeg version N-89925-gd4967c0 Copyright (c) 2000-2018 the FFmpeg
developers
built with gcc 6.3.0 (GCC)
configuration: --enable-gpl
libavutil 56. 7.100 / 56. 7.100
libavcodec 58. 9.100 / 58. 9.100
libavformat 58. 7.100 / 58. 7.100
libavdevice 58. 0.101 / 58. 0.101
libavfilter 7. 11.101 / 7. 11.101
libswscale 5. 0.101 / 5. 0.101
libswresample 3. 0.101 / 3. 0.101
libpostproc 55. 0.100 / 55. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clipcanvas_14348_offline.mp4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: isommp41avc1
creation_time : 2009-02-19T18:49:05.000000Z
Duration: 00:00:08.04, start: 0.000000, bitrate: 3129 kb/s
Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv),
1024x576 [SAR 1:1 DAR 16:9], 3009 kb/s, 25 fps, 25 tbr, 600 tbn, 50 tbc
(default)
Metadata:
creation_time : 2009-02-19T18:49:05.000000Z
handler_name : ?Apple Video Media Handler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
stereo, fltp, 128 kb/s (default)
Metadata:
creation_time : 2009-02-19T18:49:05.000000Z
handler_name : ?Apple Sound Media Handler
Stream #0:2(eng): Data: none (mp4s / 0x7334706D), 0 kb/s (default)
Metadata:
creation_time : 2009-02-19T18:49:05.000000Z
handler_name : ?
Stream #0:3(eng): Data: none (mp4s / 0x7334706D), 0 kb/s (default)
Metadata:
creation_time : 2009-02-19T18:49:05.000000Z
Please use -q:a or -q:v, -qscale is ambiguous
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'out.avi':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: isommp41avc1
ISFT : Lavf58.7.100
Stream #0:0(eng): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1024x576
[SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
creation_time : 2009-02-19T18:49:05.000000Z
handler_name : ?Apple Video Media Handler
encoder : Lavc58.9.100 mpeg4
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame= 76 fps=0.0 q=2.0 Lsize= 2612kB time=00:00:03.04
bitrate=7037.8kbits/s speed=20.4x
video:2604kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.285629%
}}}
The output file looks very broken.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6991#comment:1>
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