[FFmpeg-devel] [PATCH] Implement PAFF in H.264

Jeff Downs heydowns
Wed Jul 23 20:28:46 CEST 2008

On Mon, 21 Jul 2008, Michael Niedermayer wrote:


> > +            /* Frame or first field in a potentially complementary pair */
> > +            assert(!s->current_picture_ptr);
> This assert is false for FM1_BT_B.h264 and FM2_SVA_C.264, please fix this!

This assert was to indicate if we would be allocating a new picture 
(frame_start) without cleaning up the old one.  This was important until 
recently because all pictures were marked reference when created, and not 
cleared unless they got to frame_end (where current_picture_ptr is 

Your recent change (sensibly!) sets references off unless marked as such.

For at least FM1_BT_B.h264, the assert is tripped because processing of a 
frame is aborted (QP 4294967295 out of range) and the next frame 
processing begins w/out cleaning up current_picture_ptr.

At this point, assuming you are ok with the current_picture_ptr NOT being 
cleared on frame processing errors, the assert could be changed to: 

assert(!s0->current_picture_ptr || !s0->current_picture_ptr->reference)


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