[FFmpeg-devel] [PATCH 1/1] RFC discard all frames when looking for codec parameters

[Joakim Plate]

Okey. so fate breakage would seem to stem from has_b_frames not being
calculated for h264 when skipping frames. has_b_frames is normally updated
in h264.c:decode_postinit.

Skipping h264.c:4848:
            if (avctx->skip_frame >= AVDISCARD_NONREF &&
                h->nal_ref_idc == 0 &&
                h->nal_unit_type != NAL_SEI)
                continue;
​
Resolves that issue and fate passes. From what i can see, the code will
still skip the actual decoding of slices even with above hunk removed. How
big performance hit it would be to remove that in the skip case i'm not
sure.

Any thoughts?