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

[Kieran O Leary]

Hi,

Not sure if this is still the case, but I think most digitisation software
(non-DV) will just capture the starting timecode anyhow. Any
discontinuities on the tape itself then won’t make their way over to the
actual timecode track. So Ffmpeg storing the timecode of first frame for
MKV as metadata can be good enough (depending on context), as it will
generate a new timecode track for further transcodes with that initial
starting timecode value if the container supports those tracks.

Best,

Kieran

On Mon 5 May 2025 at 10:43, Christian Sievers via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

> Hello everyone,
>
> Thank you, this has been very helpful! So I think I have two options:
>
> - Wait until Matroska fully supports timecodes, which might take a while.
>
> - Or continue to use Quicktime, but with FFV1. Not as open and free, but
> supports timecode data. This would be a somewhat unusual way to go, I
> suppose.
>
>
>
> > On 3. May 2025, at 13:39, Jerome Martinez <jerome at mediaarea.net> wrote:
> >
> > 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
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