Changing frame rate of HEVC MKVs

[Luke M]

I used mkvtoolnix to change the frame rate of a HEVC mkv. My understanding is this only affects the container, not the HEVC stream. Is that a problem or do most or all players ignore the video stream timing? (It worked with the one player I tried).

[jagabo]

Not all players respect the container level frame rate flags. Especially outside a computer (like the media players built into some TVs and Blu-ray players).

[Luke M]

Do you know of any utility that can change the frame rate of an HEVC stream?

[LigH.de]

You could try NVHSP

[sneaker]

https://ffmpeg.org/ffmpeg-bitstream-filters.html#hevc_005fmetadata

[Luke M]

https://ffmpeg.org/ffmpeg-bitstream-filters.html#hevc_005fmetadata

Thank you! This seems to work (for 25fps):

ffmpeg -i input.mkv -c copy -bsf:v hevc_metadata=tick_rate=25:num_ticks_poc_diff_one=1 output.mkv