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Verify long_ref_count!=0. Fix issue 281.
Originally committed as revision 11171 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -3662,7 +3662,7 @@ static int decode_ref_pic_marking(H264Context *h, GetBitContext *gb){
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}else{
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assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
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if(h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
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if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&
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!(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) {
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h->mmco[0].opcode= MMCO_SHORT2UNUSED;
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h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num;
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