hevc: check that the VCL NAL types are the same for all slice segments of a frame

Fixes possible invalid memory access for mismatching skipped/non-skipped
slice segments.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Sample-Id: 00001533-google
vf_overlay: add eof_action switch

Signed-off-by: Anton Khirnov <anton@khirnov.net>
utvideoenc: Add support for the new BT.709 FourCCs for YCbCr

With cli usage the decoder might have not set the colorspace during
encoder init, manual colorspace override might be needed in such
cases.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
lavf: do basic sanity checking on muxed packets

Reject packets for non-existing or attachment streams.
lavf: ignore attachment streams for interleaving purposes

Those streams should never get any packets by definition.
vp8: use a fixed-size edge emu buffer

The reason is the same as for e588615d938f8581f0d6f3771662d08cadfc00de

Based on a patch by Ronald S. Bultje <rsbultje@gmail.com>
h264: reset data partitioning at the beginning of each decode call

Prevents using GetBitContexts with data from previous calls.

Fixes access to freed memory.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org
jvdec: K&R formatting cosmetics

Signed-off-by: Diego Biurrun <diego@biurrun.de>
avcodec: Suppress deprecation warnings from avcodec_alloc_frame()

The function is itself obsolete and slated for removal.