[FFmpeg-trac] #3508(undetermined:new): Cannot open stats file on second pass when attempting to generate multiple outputs.
FFmpeg
trac at avcodec.org
Wed Apr 2 09:32:23 CEST 2014
#3508: Cannot open stats file on second pass when attempting to generate multiple
outputs.
-------------------------------------+-------------------------------------
Reporter: ianken | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
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Comment (by cehoyos):
What's wrong with the following?
{{{
$ ffmpeg -y -i big_buck_bunny_720p_stereo.avi -vf
scale=240:trunc(ow/a/2)*2 -g 48 -keyint_min 6 -vcodec mpeg4 -b:v 400k
-pass 1 -an -f mp4 NUL -vf scale=320:trunc(ow/a/2)*2 -g 48 -keyint_min 6
-vcodec mpeg4 -b:v 700k -pass 1 -an -f mp4 NUL
$ ffmpeg -y -i big_buck_bunny_720p_stereo.avi -vf
scale=240:trunc(ow/a/2)*2 -g 48 -keyint_min 6 -vcodec mpeg4 -b:v 400k
-pass 2 -an -f mp4 big_buck_bunny_400.mp4 -vf scale=320:trunc(ow/a/2)*2 -g
48 -keyint_min 6 -vcodec mpeg4 -b:v 700k -pass 2 -an -f mp4
big_buck_bunny_700.mp4
}}}
(I don't remember if you are using {{{-vf}}} correctly, in theory, a
complex filtergraph might be needed.)
Note that even if your command lines would work (they may work with a
{{{cp ffmpeg2pass-0.log ffmpeg2pass-1.log && cp ffmpeg2pass-0.log.mbtree
ffmpeg2pass-1.log.mbtree}}} in-between), this is not how two-pass encoding
is supposed to by used to the best of my knowledge.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3508#comment:5>
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