Carl Eugen Hoyos <ceho...@rainbow.studorg.tuwien.ac.at> added the comment:
Decoding is bitexact compared to the reference decoder (17.1) except for one
additional frame, so there is no problem with the "visual quality" afaict.
There probably is an issue that the output file plays too fast (2x) after
dropping every second frame. If I remux into mkv or mp4, the resulting file has
~450 (instead of 225) frames.
This may be related to issue 1807, it is - afaict - not related to issue 904
(which looks similar with ffplay, but works fine with ffmpeg).
ffmpeg -i tandberg.h264 -vcodec copy out.mp4
FFmpeg version SVN-r23884, Copyright (c) 2000-2010 the FFmpeg developers
built on Jun 29 2010 11:33:36 with gcc 4.4.4
configuration: --cc=/usr/local/gcc-4.4.4/bin/gcc
libavutil 50.19. 0 / 50.19. 0
libavcodec 52.78. 0 / 52.78. 0
libavformat 52.71. 0 / 52.71. 0
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.20. 1 / 1.20. 1
libswscale 0.11. 0 / 0.11. 0
[h264 @ 0x11bd720] number of reference frames exceeds max (probably corrupt
input), discarding one
Last message repeated 77 times
[h264 @ 0x11bd720] mmco: unref short failure
[h264 @ 0x11bc470] max_analyze_duration reached
[h264 @ 0x11bc470] Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1)
-> 25.00 (50/2)
Input #0, h264, from 'tandberg.h264':
Duration: N/A, bitrate: N/A
Stream #0.0: Video: h264, yuvj420p, 544x576 [PAR 64:33 DAR 544:297], 50 fps,
25 tbr, 1200k tbn, 50 tbc
Output #0, mp4, to 'out.mp4':
Metadata:
encoder : Lavf52.71.0
Stream #0.0: Video: ![0][0][0] / 0x0021, yuvj420p, 544x576 [PAR 64:33 DAR
544:297], q=2-31, 50 tbn, 25 tbc
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
[NULL @ 0x11bd720] missing picture in access unit
frame= 450 fps= 0 q=-1.0 Lsize= 2127kB time=9.02 bitrate=1932.0kbits/s
video:2123kB audio:0kB global headers:0kB muxing overhead 0.202994%
----------
status: new -> open
substatus: new -> open
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FFmpeg issue tracker <iss...@roundup.ffmpeg.org>
<https://roundup.ffmpeg.org/issue2050>
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