VP9 Converter:VP9 Encoder/Decoder to Convert WebM VP9 in Mac/Windows
VP9 Encoder and Decoder: Convert between VP9, MP4, AVI, FLV, H.265, WMV
The WebM Project | VP Codec ISO Media File Format Binding
Preset with VP9 in MP4 container · Issue #3478 · HandBrake/HandBrake · GitHub
Membrane on X: "Membrane development highlight: MP4 support in Membrane is in its final stage of development! 👉it will make possible to record WebRTC sessions to MP4 with H264+AAC. 👉WebM support coming
Which Codecs Does YouTube Use? - Streaming Learning Center