I presume OpenGL is dead then I guess.
sudo apt install ffmpeg gpac
git clone https://github.com/gpac/gpac.git
sudo apt update
sudo apt install build-essential zlib1g-dev libfreetype6-dev libjpeg62-dev libpng-dev libopenjp2-7-dev libmad0-dev libfaad-dev libogg-dev libvorbis-dev libtheora-dev liba52-0.7.4-dev libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libavresample-dev libxv-dev x11proto-video-dev libgl1-mesa-dev x11proto-gl-dev linux-sound-base libxvidcore-dev libssl-dev libjack-dev libasound2-dev libpulse-dev libsdl1.2-dev dvb-apps libavcodec-extra libavdevice-dev libmozjs-52-dev
cd gpac
./configure
make
sudo make install
MP4Box -add-image "video.mkv":time=4841:primary -ab heix -new image.heic
FLAC is lossless and can store 16 bit CDDA samples. A lot of torrents are published as .cue+.flac so you can burn a perfect copy of original CD.
HEVC -> OpenEXR losslessness only depends if OpenEXR supports Rec. 2020 directly or have better colorspace that is a strict superset of Rec. 2020.
video programs
And why would I bother with only demuxing keyframes?
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