[MPlayer-users] Best quality universal format?...
Steven M. Schultz
sms at 2BSD.COM
Thu Feb 19 23:24:25 CET 2004
On Thu, 19 Feb 2004, Paul Simpson wrote:
> I think I'm almost there. Here's what I've done:
> $ mencoder "mf://pics/*.tga" -mf w=720:h=576:fps=25 -o output.avi -ovc
> lavc -lavcopts vcodec=mpeg4
> // turn my .tga sequence into a mpeg4 .avi file (this plays fine in
> windows media player as a divx4 movie)
> $ avi2raw output.avi output.m4v
> avi2raw - mpeg4ip version 1.0
> 54 video frames written
> So far so good.
Right - that's what I do to get a .m4v file from mencoder.
> $ mp4creator -c output.m4v -rate=25 -H output.mp4
Can leave out the -H unless you're streaming the video since the -H
adds a "hint" track that's only used for things such as the
Darwin Streaming Server.
> I get a quicktime data corrupted err msg.
Do you have a Mac around to test with?
> You mentioned the lavcopts bit_exect option. I can't see that anywhere
> - and I'm using
> MPlayer 1.0pre3-RPM-3.2.2
I use the CVS version of ffmpeg/libavcodec + mplayer. If you do
a 'man mencoder' and see this paragraph:
Use only bit exact algorithms (except (i)dct). Ad-
ditionally bit_exact disables several optimizations
and thus should only be used for regression tests,
which need binary identical files even if the en-
coder version changes. This also suppresses the
user_data header in MPEG-4 streams. Do not use
this option unless you know exactly what you are
then you simply add "bit_exact" to the lavcopts line you use with
If you don't have that option then it may be necessary to build
the cvs version of mencoder and ffmpeg/libavcodec.
> ..this is where I get unstuck. output.mp4 doesn't play in quicktime on
> my windows box.
Apple's QT player would pop up a warning about a 'corrupted file'
but after dismissing the error the file would play fine.
I do not know exactly why the person I sent the mp4 file to had
problems playing back - I suspect they didn't have the right codecs
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