[FFmpeg-user] retain timecode stream when transcoding v210 to FFV1/MKV

[Jerome Martinez]

Le 03/05/2025 à 12:57, BloodMan a écrit :
> Hello Christian,
>
> OK. right.
> But in general you have answer in error description: " Only audio, 
> video, and subtitles are supported for Matroska." This means that 
> timecodes was not supported by matroska.

Tiny correction: not (yet) supported by FFmpeg for Matroska


>
> In RFC you have confirmation: https://datatracker.ietf.org/doc/rfc9559/
> "11.  Timestamps - Historically, timestamps in Matroska were 
> mistakenly called timecodes."
>
> So, or at least that's how I understand it, Matroska doesn't have 
> timecode support, only timestamp support - which is not the same and 
> apparently "doesn't convert" - or at least that's not the role of the 
> encoder.

It is relatively new but there is now a support timecodes in Matroska:
https://github.com/ietf-wg-cellar/matroska-specification/blob/master/cellar-codec/block_additional_mappings/smpte-st12-1-timecode.md

We are working on implementing that, we plan to send a patch to 
ffmpeg-devel when it is ready.

Jérôme