On Sun, 24 Jan 2016, Carl Eugen Hoyos wrote:
How I can I reproduce this issue?
I get the 2 warning messages with all of the mpeg(mpeg2video/ac3) files
I've tried so far. All of my files are mpeg container with mpeg2 video
and ac3 audio, some may have multiple ac3 audio streams and/or dvdsub
subtitle streams.
The original source for these is either from DVDs dumped using mpv
--stream-dump, or DVDs which have been re-muxed and/or re-encoded with
ffmpeg or re-encoded from bluray mpegts/h264 using ffmpeg.
I *think* the buffer underflow errors are only seen on the files that were
re-encoded from bluray .m2ts files. The bluray source files would have
been either mpegts(h264/dts) or mpegts(h264/ac3) and then scaled down from
1920x1080 to 720x480 into mpeg(mpeg2video/ac3).
In most cases the re-encoding was done with some previous version of
ffmpeg, BUT the example I gave in my initial message was created using the
most recent ffmpeg (git master as of 01/23). eg:
$ ffmpeg-dev -i 'bluray/BDMV/STREAM/00101.m2ts' -codec:v mpeg2video -b:v
16384k -bufsize 4096k -maxrate 30000k -codec:a ac3 -b:a 448k -ar 48000 -vf
scale=-1:720 -t 300 -f vob clip.mpg
$ ffmpeg-dev -i clip.mpg -codec copy -f vob clip-copy-dev.mpg
$ ffmpeg -i clip.mpg -codec copy -f vob clip-copy-2.8.5.mpg
Where "ffmpeg-dev" is git master (as of 01/23) and "ffmpeg" is 2.8.5.
To re-iterate what I said in my initial message, the copy done with git
master gives the 2 warnings and buffer underflow errors and the copy done
with 2.8.5 doesn't give any warnings/errors.
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