MEncoder

„MEncoder is a free command line video decoding, encoding and filtering tool released under the GNU General Public License. It is a close sibling to MPlayer and can convert all the formats that MPlayer understands into a variety of compressed and uncompressed formats using different codecs.“

MEncoder. (2008, February 23). In Wikipedia, The Free Encyclopedia. Retrieved 18:57, April 5, 2008, from
http://en.wikipedia.org/w/index.php?title=MEncoder&oldid=193447614


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Sunday, May 4, 2008

Re: [MEncoder-users] A/V sync problem when encoding TS stream into MPEG4

On Sat, 3 May 2008, Jiri Hofman wrote:

> I am experiencing a mencoder problem which appeared during development.
> I am not sure if this is a duplicate report, however, I will describe it.

> After I upgraded to latest version or SVN, A/V sync is lost.

> mencoder "$1".m2t -edl "$1".edl -hr-edl-seek -aspect 16:9 -vf
> scale=1024:-2 -ovc lavc -oac lavc -channels 2 -lavcopts
> acodec=ac3:abitrate=128:vcodec=mpeg4:vbitrate=1500:mbd=2 -o "$1".avi

This is a longstanding problem. Transcode's avisync should fix the
timestamps, though you should probably add harddup to the end of the
filter chain (this is almost always a good idea).

I'd also stick an autoaspect in the lavc options to ensure that the aspect
ratio gets encoded in the video stream. Avisync will strip the vprp
chunk, which isn't universally respected anyway.
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