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wmv is often detected as 90k FPS by ffmpeg. (That's a placeholder value since the demuxer doesn't look into the stream right away, to see the intervals between the first few frames). ffmpeg's default for mp4 output is CFR mode, hard-duplicating frames to bring the framerate up (to 90000FPS in this case). Even the most efficient codecs take a few bytes to ...


If you just want to embed a cover you might consider keeping the result as mp3, for example: ffmpeg -i original.mp3 -i cover.png -map 0:0 -map 1:0 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" -id3v2_version 3 -write_id3v1 1 result.mp3 If you are creating mp4's, e.g. for YouTube, then I suggest to split the process to two steps - ...

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