[Ffmpeg-devel] WMA encoding and Windows Media Player for Mac OS X
Michael Niedermayer
michaelni
Fri Mar 9 00:32:51 CET 2007
Hi
On Thu, Mar 08, 2007 at 04:42:59PM -0600, Tyler Loch wrote:
> >what is the source for the encoding? .asf? do you encode or stream
> >copy
> >(-vcodec copy / -acodec copy)?
>
> For the majority of tests, I've been encoding from an H.264/AAC
> source file at 24fps to WMV2/WMAV2 .wmv.
> Encoding to .avi and then streamcopying to .asf/.wmv has the same
> problem.
>
> >does encoding with -intra change anything with unmodified svn?
>
> It changes the duration and location of the skips:
>
> With -intra:
> Seconds: 4--->10, 16---->22
>
> With -g 200:
> Seconds: 1--->7, 8---->15
>
> Afterwards, it plays perfectly fine.
do the first 15-22 seconds differ somehow from the rest of the video
i mean some high motion opening with the remainder of the video being
more low motion like or such?
>
> Here's the commandline I'm using:
> ./ffmpeg -y -i '/Users/tylerl/Desktop/''nas-intro.mp4' -s
> 640x352 -vcodec wmv2 -g 200 -qmin 4 -b 1500k -acodec wmav2 -ar
> 48000 -ac 2 -ab 128k '/Users/tylerl/Desktop/'/'0304svn109.wmv'
>
> Would it be useful to see the entire output?
dunno ...
a few more random ideas ...
what happens if you increase
put_le32(pb, bit_rate); /* Nominal data rate in bps */
that is 2*bit_rate or so?
and what happens if you comment out the following:
asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->nb_index_count);
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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