[FFmpeg-user] How to create MP4/fragmented MP4 with specified timescale

[Wesley Wen]

Hi,

For some reason, I want to create MP4 (or fragmented MP4) with specified
timescale value, say 1000, of MediaHeaderBox.

I can use FFmpeg to transcode file(s) to MP4 files(s), but the timescale is
usually 30000; I think the reason is about the FPS.

But my question is how can I specify the timescale to be 1000?

Thanks,
Wesley