[Cin]ffmpeg 8.1 was branched

https://source.ffmpeg.org/gitweb/ffmpeg.git/shortlog/refs/heads/release/8.1 I think I saw some changes in mpegts muxer so our patches may fail to apply (not tested yet) Main thing for us probably prores Vulkan decoding/encoding. there is also DPX vulkan decoder, but I do not really use this format.