#2592: Bug with b-frames?
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Reporter: microchip | Type: defect
Status: new | Priority: normal
Component: FFmpeg | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Hi,
I pulled ffmpeg from git today and started to encode to mpeg2video with 2
b-frames in 2-pass mode. I noticed that the git version behaves
differently than the 1.2.1 version of ffmpeg. I looked at the passlog file
and noticed that all type:3 entries have in:0 and out:0. In 1.2.1, the
type:3 entries have entries > 0. My command line for both git and 1.2.1
version is identical and is as follows:
{{{
/usr/local/bin/ffmpeg -i /home/neutrino/file2dvd/Con_Air/tmp30017.avi -f
dvd -c:v mpeg2video -vf scale=720:368,pad=720:480:0:56,setdar=16/9
-sws_flags spline -aspect 16:9 -mbd 2 -precmp 2 -cmp 2 -subcmp 2 -trellis
2 -dia_size -1 -last_pred 4 -flags +mv0 -mpv_flags +cbp_rd -bf 2 -dc 11
-preme 2 -mv0_threshold 0 -bidir_refine 2 -g 18 -r 24000/1001 -b:v 4653k
-c:a ac3 -b:a 192k -ar 48000 -passlogfile
/home/neutrino/file2dvd/Con_Air/Con_Air -pass 1 -y /dev/null
}}}
The second pass is identical but with -pass 2 option. I also noticed that
when using the git version, during the second pass, the bitrate seems very
low compared to the first pass. This is not the case when using the 1.2.1
version of ffmpeg.
Both ffmpeg's are compiled with the following options;
{{{
./configure --enable-shared --enable-gpl --enable-version3 --enable-
libx264 --enable-libxvid --enable-libmp3lame --enable-avresample
}}}
I am attatching 2 log files, one from ffmpeg 1.2.1 and one from the git
version.
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2592>
FFmpeg <http://ffmpeg.org>
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