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ffmpeg - Conversions - Convert H265 to AV1

ffmpeg -y -i a.mp4 -c:v libaom-av1 -strict -2 -b:v 3000K -maxrate 6000K -cpu-used 8 -pass 2 -f matroska out.mkv
 
ffmpeg -i input.mp4 -c:v av1 output.av1

ffmpeg -y -i input.mp4 -c:v libaom-av1 -strict -2 -b:v 3000K -maxrate 6000K -cpu-used 8 -pass 1 -f matroska NUL & \
 
ffmpeg -i input.mp4 -c:v libaom-av1 -strict -2 -b:v 3000K -maxrate 6000K -cpu-used 0 -pass 2 output_AV1.mkv

NOTE: This is extremely slow!

This uses the libaom-av1 encoder.

NOTE: AV1 is implemented in libaom and svt-av1.

Libaom is the reference codec, it produces smaller files than svt-av1 but it is slow.
The svt-av1 encoder is optimized for speed and produces bigger files than libaom.