[FFmpeg-devel] [PATCH 1/2] avformat/mov: fix timecode with high frame rate content

[Marton Balint]

On Mon, 11 Apr 2022, Marton Balint wrote:

>
>
> On Mon, 11 Apr 2022, Anton Khirnov wrote:
>
>>  Quoting Marton Balint (2022-04-10 20:11:59)
>>>  60 fps content have "Number of Frames" set to 30 in the tmcd atom, but
>>>  the
>>>  frame duration / timescale reflects the original video frame rate.
>>>
>>>  Therefore we multiply the frame count with the quotient of the rounded
>>>  timecode
>>>  frame rate and the "Number of Frames" per second to get a frame count in
>>>  the original
>>>  (higher) frame rate.
>>>
>>>  Note that the frames part in the timecode will be in high frame rate
>>>  which will
>>>  make the timecode different to e.g. MediaInfo which seems to show the 30
>>>  fps
>>>  timecode even for 120 fps content.
>>>
>>>  Regression since 428b4aacb1a91a267650de644519882a5f700388.
>>>
>>>  Fixes ticket #9710.
>>>  Fixes ticket #9492.
>>
>>  Sounds like there should be a test for this.
>
> The smallest file I managed to find which is affected by this is
> mov/canon_6d/mvi_9114.mov, but that is still 12 MB, therefore probably not
> fit for addition to fate-samples.
>
> With our muxer, the issue is not reproducible, so remuxing is not an
> option.

Will apply soon.

Regards,
Marton