On 18 Mar 2018, at 07:52, Mark Burton <mwjbur...@gmail.com> wrote:
> On 14 Mar 2018, at 23:20, Michael Niedermayer <mich...@niedermayer.cc 
> <mailto:mich...@niedermayer.cc>> wrote:
>> for other cases 600 is less accurate
>> for example input that uses timestamps in ms precission
>> like flv
>> but also 30000/1001 will be less precisse
> 
> In the case of a Quicktime encoder, a 30000/1001 frame rate encode would 
> still have a Movie Header timescale of 600, but a video track timescale of 
> 2997. Since ffmpeg allows us to specify the video_track_timescale, this 
> output could still be achieved.
> 
> As for flv and formats that use ms precision, I’ll freely admit thats not 
> something I work with so am not in a position to comment. However, would 
> these formats not also have the benefit of the current flag to set 
> video_track_timescale?

Or go with 1200, which is more accurate for ms precision formats and also works 
for all major frame rates.

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