Question

I have a bunch of, I think, x264 encoded AVIs that I d like to convert to m4v so that I can play with Quicktime. Here s how I created them

First I dump the vob from DVD with this:

$ mplayer -dumpstream -dumpfile new.vob dvd://1

Then I compress it:

$ mencoder -oac copy -o new.avi -ovc x264 -x264encopts crf=18 new.vob

I tried doing this to convertthem to m4v, but it s blowing up...

I tried dumping the h264/acc streams:

$ mplayer new.avi -dumpvideo -dumpfile new.h264
$ mplayer new.avi -dumpaudio -dumpfile new.acc

And remuxing(?) with MP4Box but I m getting an error:

$ MP4Box -add new.h264#video -add new.aac#audio new.m4v
Cannot find H264 start code
Error importing new.h264#video: BitStream Not Compliant

So not sure what to do now...

Answer 1

If I were you, I would just use ffmpeg. ffmpeg has a magic ‘codec’ called copy which simply copies the content, rather than re-encoding, which is useful for precisely your use case — changing container without re-encoding.

From the ffmpeg man page:

-vcodec codec

Force video codec to codec. Use the "copy" special value to tell that the raw codec data must be copied as is.

-acodec codec

Force audio codec to codec. Use the "copy" special value to specify that the raw codec data must be copied as is.

So, to put this into practice:

$ ffmpeg -i new.avi -acodec copy -vcodec copy new.m4v

I use this technique for reformatting H.264 videos inside an FLV container into an MP4 container, which drastically improves lip sync in some cases.

Answer 2

You should use handbrake.

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