Add a native encoder for the Playdate PDV format.
Add a muxer for the Playdate PDV container format. The muxer writes the frame table and packet layout required by the Playdate runtime.
Add FATE coverage for PDV encoding and decoding via lavf, including intra and inter frame cases, skip-nokey decoding, and container-level seek coverage.
Furthermore, the flags for H264/HEVC have been updated to those renamed in AMF 1.5.0+, instead of using the old ones that were already marked as deprecated:
The US country_code path in parse_itut_t35_metadata() reads the the provider_code with bytestream2_get_be16u(), which is a unchecked version that does not validate the remaining length before reading.