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avcodec/h264_refs: improve key frame detection heuristic

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Fixes Ticket3186

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e3d7a3978b)
This commit is contained in:
Michael Niedermayer 2013-12-02 02:36:58 +01:00 committed by Carl Eugen Hoyos
parent 1141a18e89
commit c765b64641
1 changed files with 6 additions and 1 deletions
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7
libavcodec/h264_refs.c
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@ -562,6 +562,7 @@ int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice)
int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
{
int i, av_uninit(j);
int pps_count;
int current_ref_assigned = 0, err = 0;
Picture *av_uninit(pic);
@ -732,9 +733,13 @@ int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count)
print_short_term(h);
print_long_term(h);
pps_count = 0;
for (i = 0; i < FF_ARRAY_ELEMS(h->pps_buffers); i++)
pps_count += !!h->pps_buffers[i];
if ( err >= 0
&& h->long_ref_count==0
&& h->short_ref_count<=2
&& (h->short_ref_count<=2 || h->pps.ref_count[0] <= 1 && h->pps.ref_count[1] <= 1 && pps_count == 1)
&& h->pps.ref_count[0]<=2 + (h->picture_structure != PICT_FRAME)
&& h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){
h->cur_pic_ptr->sync |= 1;