[FFmpeg-user] mpeg2 bufsize question
lists.davep at gmail.com
Wed Jan 18 16:24:35 CET 2012
On Tue, Jan 17, 2012 at 18:11, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> Dave P <lists.davep <at> gmail.com> writes:
>> I recall reading on here somewhere that -f vob was for program
> I believe it tries to conform to the DVD standard (at least that is what I would
> expect) and this standard is certainly not written for 1920x1080.
> -f mpeg (or .mpg as output filename) forces mpeg program streams.
>> I get the same result without it. Muxrate values ranging from 2M to 25M still
>> generate errors.
> I can now reproduce your problem (I originally tested with an Apple trailer that
> starts with a still and only outputs the warnings / errors later).
> I suspect the bug is that -bufsize (which is the right option) does not work
> correctly with -qscale, a work-around is to change (current) line 377 in
> libavformat/mpegenc.c "stream->max_buffer_size =" to a significantly larger
> value, I tested "10*" successfully on mentioned trailer.
> (The line is the one following the warning message "VBV buffer size not set".)
> Carl Eugen
I did some tests with similar command lines from the original message.
Some editing programs complain about files produced with "-f mpeg" as
having mpeg2video in mpeg1 system streams. It's not a problem for
ff-based players/decoders, though.
c:\ffmpeg_x64\bin>ffmpeg -formats | findstr "mpeg"
DE ffmetadata FFmpeg metadata in text format
DE mpeg MPEG-1 System format
E mpeg1video raw MPEG-1 video
E mpeg2video raw MPEG-2 video
DE mpegts MPEG-2 transport stream format
D mpegtsraw MPEG-2 raw transport stream format
D mpegvideo raw MPEG video
DE yuv4mpegpipe YUV4MPEG pipe format
c:\ffmpeg_x64\bin>ffmpeg -formats | findstr "vob"
E vob MPEG-2 PS format (VOB)
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