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ffmpeg - Encoding - CPU Encoding

Convert the video to HEVC while keeping the auto track and everything else the same.

ffmpeg -i input.mp4 -c:v libx265 -c:a copy -preset slow output.mp4

NOTE:

This uses the libx265 encoder to encode the video into the HEVC format.
This will copy the audio track without re-encoding it.
The -preset slow option will produce the highest quality output, but it will take longer to process.