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ffmpeg - Encoding - h265

H.265/HEVC Video Encoding.

The libx265 encoder offers around 25–50% bitrate savings compared to H.264 video encoded with libx264, while retaining the same visual quality.

These gains will be most pronounced at resolutions of 1080p and higher.

Constant Rate Factor (CRF)

References

https://trac.ffmpeg.org/wiki/Encode/H.265