[Ffmpeg-devel] trouble with h264.c
Fri May 13 17:06:58 CEST 2005
Scott Treude <scott at niceshoes.com> writes:
> On Friday, May 13, 2005 10:41 AM, M?ns Rullg?rd <mru at inprovide.com> wrote:
>>Scott Treude <scott at niceshoes.com> writes:
>>> I'm trying to convert an h264 quicktime to a series of ppm files and
>>> I'm receiving the following error:
>>> ffmpeg: h264.c:2316: mc_dir_part: Assertion `pic->data' failed.
>>> The command I'm using is:
>>> /usr/local/bin/ffmpeg -ss 100 -t .2 -i myMovie.mov test%d.ppm
>>> It seems to work fine without the -ss; so is seeking a problem with h264?
>>This is a know problem, at least to me. Unfortunately, I'm not sure
>>how to fix it. The problem is that a reference picture used by the
>>picture being decoded is unavailable, since it was before the point
>>you started decoding at.
>>Michael, Loren, what should we do about this? It used to work, a long
>>time ago. IIRC, it broke around the time B-frame support was
> thanks for the insight. Wouldn't that be a problem with other
> codec's as well (like mpeg2)?
The mpeg2 decoder seems to handle it, one way or another.
> I assume that the reference picture is used to create the pictures
> (frames?) following it. Is there a way to go backwards to the
> nearest reference pic to retrieve it and then jump forward to create
> the desired pictures?
If the container flags the key frames, you can do this. It's not the
business of libavcodec, though.
mru at inprovide.com
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