After successfully converting a 4k MP4 file to WebM, Windows explorer progress bar constantly loads, thumbnail refuses to generate, when libvpx- vp9 is used instead of libvpx (i.e. vp8). : r/ffmpeg
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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
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javascript - Convert video codecs to vp9 to mp4? - Stack Overflow