goyuix/ffmpeg-hevc-mp4-sample.bat

Created February 6, 2018 17:32

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Sample ffmpeg encode for x265 HEVC web-optimized MP4

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ffmpeg-hevc-mp4-sample.bat

ffmpeg -i input.mkv -movflags faststart -c:v libx265 -crf 25 -c:a aac -b:a 128k output.mp4

ghost commented May 3, 2020

You should use .mkv as the output file-extension. It is optimized for h.265 encoding. Plus, the mkv container already has the ATOM at the start of the file https://trac.ffmpeg.org/wiki/Encode/YouTube#faststartforMP4M4VMOVfiles. YouTube supports upload of .mkv-files.
If you'll stick with the .mp4 extension, fix the way you use the flag: -moveflags "+faststart". The "-wrapping is for Windows' users.
Optionally specify a preset. The quality stays the same, it only matters in the file-size. I use -preset ultrafast to be just done with it, but alternatively you may also use -preset veryslow (will took much longer but the file-size will be smaller).
25 is quite too low. h.265's default is CRF-28 which quality-wise is same as h.264's default of CRF-23 (half the file-size).

https://trac.ffmpeg.org/wiki/Encode/H.265 vs. https://trac.ffmpeg.org/wiki/Encode/H.264

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