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ffmpeg merge 60fps and 30 fps mp4 into one file

In the current folder, covert all mp4 files to TS. Then use the Windows 'copy' command to merge every TS. Then, once you have a single ts, transmux to mp4 without re-encoding. for %i in (*.mp4) do ...
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How to embed cover art into MP4 without errors?

ffmpeg -i sample.mp4 -i sample.png -map 0 -map 1 -c copy -disposition:v:1 attached_pic sample_w_artwork.mp4 just change v:0 to v:1
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Widely compatible video format with lossless audio

According to Mozilla Developers MPEG-4 containers can include FLAC audio. Ditto for OGG containers.
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