[FFmpeg-trac] #1080(FFmpeg:new): Pixel format autoselection does not work correctly with -vf format
FFmpeg
trac at avcodec.org
Fri Mar 16 19:53:50 CET 2012
#1080: Pixel format autoselection does not work correctly with -vf format
---------------------------------------+--------------------------------
Reporter: cehoyos | Owner:
Type: enhancement | Status: new
Priority: minor | Component: FFmpeg
Version: git-master | Keywords:
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
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(bug 252 by Alex Converse)
If the format video filter is used, ffmpeg's pixel format auto selection
does not work as expected:
{{{
$ ./ffmpeg -i tests/lena.pnm -pix_fmt yuv422p -vcodec mpeg2video -qscale 2
out.mpg
}}}
{{{
$ ./ffmpeg -i out.mpg -vf format=yuv420p -vcodec mpeg2video out2.mpg
ffmpeg version N-38811-ga04a97b Copyright (c) 2000-2012 the FFmpeg
developers
built on Mar 15 2012 14:40:16 with gcc 4.3.2
configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl
libavutil 51. 42.100 / 51. 42.100
libavcodec 54. 10.100 / 54. 10.100
libavformat 54. 2.100 / 54. 2.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 64.101 / 2. 64.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 7.100 / 0. 7.100
libpostproc 52. 0.100 / 52. 0.100
[mpeg @ 0x8eb8aa0] Format mpeg detected only with low score of 25,
misdetection possible!
Input #0, mpeg, from 'out.mpg':
Duration: N/A, start: 0.500000, bitrate: N/A
Stream #0:0[0x1e0]: Video: mpeg2video (4:2:2), yuv422p, 256x256 [SAR
1:1 DAR 1:1], 104857 kb/s, 25 tbr, 90k tbn, 50 tbc
[buffer @ 0x8ed1720] w:256 h:256 pixfmt:yuv422p tb:1/1000000 sar:1/1
sws_param:
[buffersink @ 0x8ec02c0] auto-inserting filter 'auto-inserted scale 0'
between the filter 'Parsed_format_0' and the filter 'out'
[format @ 0x8ec0720] auto-inserting filter 'auto-inserted scale 1' between
the filter 'src' and the filter 'Parsed_format_0'
[scale @ 0x8eb3060] w:256 h:256 fmt:yuv422p -> w:256 h:256 fmt:yuv420p
flags:0x4
[scale @ 0x8ec0560] w:256 h:256 fmt:yuv420p -> w:256 h:256 fmt:yuv422p
flags:0x4
[mpeg @ 0x8ebf300] VBV buffer size not set, muxing may fail
Output #0, mpeg, to 'out2.mpg':
Metadata:
encoder : Lavf54.2.100
Stream #0:0: Video: mpeg2video, yuv422p, 256x256 [SAR 1:1 DAR 1:1],
q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video -> mpeg2video)
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=3.8 Lsize= 12kB time=00:00:00.04
bitrate=2457.6kbits/s
video:11kB audio:0kB global headers:0kB muxing overhead 8.092892%
}}}
ffmpeg chooses yuv422p for out2.mpg although yuv420p was requested on the
command line.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1080>
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