[FFmpeg-devel] h264: dealing with "broken links"
Mon Nov 19 21:00:51 CET 2007
Jeff Downs schrieb:
>> 1. all unavailable reference frames must be allocated and guessed from
>> available frames (just memcpy them from a random available frame would
>> do for now)
> Actually, is this still a problem for H264? Code at the bottom of
> decode_ref_pic_list_reordering appears to be looking through the whole
> reference list, filling empty spots with a copy of the current picture.
> Obviously not the perfect solution, but it makes them non-NULL.
It seems to work, as I don't get any messages regarding missing
reference pictures here.
>> 2. drop unimportant frames (B frames / theres a priority field in the NAL
>> header which could maybe be used)
> Yes. mpegvideo MPV_frame_start expects last_picture_ptr to be valid
> prior to allocating for B pictures. H264 doesn't guard this and that's
> why people keep seeing the endless loop to eventual picture buffer
> exhaustion (would assert if so enabled).
That's the problem I do see here.
Dipl.-Inform. (FH) Reinhard Nissl
mailto:rnissl at gmx.de
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