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.
This commit adds a SPIR-V assembler header file.
swscale gets runtime-defined assembly once again!
The swscale internals currently have a quirk which causes the memcpy backend to be called when the pixfmts match.
It requires special handling.