Changes in 7.1

• Raw Captions with Time (RCWT) closed caption demuxer
• LC3/LC3plus decoding/encoding using external library liblc3
• ffmpeg CLI filtergraph chaining
• LC3/LC3plus demuxer and muxer
• pad_vaapi, drawbox_vaapi filters
• vf_scale supports secondary ref input and framesync options
• vf_scale2ref deprecated
• qsv_params option added for QSV encoders
• VVC decoder compatible with DVB test content
• xHE-AAC decoder
• removed DEC Alpha DSP and support code
• VVC encoding support via libvvenc
• perlin video source
• D3D12VA HEVC encoder
• Cropping metadata parsing and writing in Matroska and MP4/MOV de/muxers
• Intel QSV-accelerated VVC decoding
• MediaCodec AAC/AMR-NB/AMR-WB/MP3 decoding
• YUV colorspace negotiation for codecs and filters, obsoleting the YUVJ pixel format
• Vulkan H.264 encoder
• Vulkan H.265 encoder
• stream specifiers in fftools can now match by stream disposition
• LCEVC enhancement data exporting in H.26x and MP4/ISOBMFF
• LCEVC filter
• MV-HEVC decoding