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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Monday, April 7, 2008

Re: [MEncoder-users] Ripping dvd to mp4

RC wrote:
> On Sun, 06 Apr 2008 12:01:01 +0200
> Erik Slagter <erik@slagter.name> wrote:
>> BTW I have indeed tried this again, and now I remember the problem.

>> Mencoder can only output reliably to avi (not even separate raw video
>> and audio stream, simultaniously...)

> Sure it can. What's "unreliable" about it?

As soon as you use b-frames, output to any other muxer than avi (maybe
the builtin ps/ts muxer, I am not sure about that) is broken. This is
documented behaviour.

>> while mp4box (gpac) cannot handle h264 in avi
> mpeg4ip (mp4creator) has no such limitation.

That might be a valid option, although the last few times I tried
mp4creator, it was segfault galore. Also IIRC it has all sorts of GUI
libs dependencies even for non-gui operation.

Bottom line of my statement is that mencoder should simply support
b-frames correctly, this problem has been around for ages and also has
been known for ages. Having said that, I won't be the one tackling this,
so I guess I'll have to shut up.

Furthermore, the mp4 output of lavf is not 100% sane (although close to
it). But that's not mencoder's fault. I'd rather stick on the safe side
and use mp4box for the muxing, these guys actually _like_ the mp4 format
(whether that's good or bad) while the ffmpeg guys really don't.

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