ffmpeg convert h264 software version:

This is to convert MPEG-4 (h264, AVC) video through software. This could be useful in case of poor conversion quality using hardware conversion.
Do not use h265 (HVAC) video since it will take way to long to convert any video through software with late 2010's/early 2020's hardware.

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I use the very slow preset, since it provides the best quality for h264 possible on ffmpeg (it is the second slowest option, the slowest option, "placebo" is to be ignored since ffmpeg officially states that it is a pointless option, not sure why they keep it around other then just to have it available).

ffmpeg -i old.WMV -c:v libx264 -preset veryslow -c:a copy output.mp4

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Source | Date: September 7th, 2021

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