[FFmpeg-user] V_QUICKTIME used as codec ID for DPX/TIFF rewrapped to Matroska

[Kieran O Leary]

Hi Carl,


On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:

> 2018-12-08 11:46 GMT+01:00, Kieran O Leary <kieran.o.leary at gmail.com>:
>
> > When re-wrapping DPX or TIFF images to Matroska, it appears that
> > FFmpeg uses the V_QUICKTIME codec ID.
>
> Where can I find the specification for tiff in matroska and dpx in
> matroska?
>

I don't think they exist - this remuxing is most likely not common/never
used. I'll get in touch with the CELLAR/IETF list and see if anyone has any
ideas. Also, as per my last email, DPX is fine - V_MS/VFW/FOURCC / dpx . I
just had a crappy command line :(

>
> > Why is this used?
>
> > Would something like V_UNCOMPRESSED (for raw TIFF anyhow)
> > be more appropriate/
>
> If you use -vcodec rawvideo instead of tiff or dpx (which are not
> rawvideo) you get V_UNCOMPRESSED but note that matroska
> is not a useful container for rawvideo because it is not well
> defined, use nut instead.
>

Cool, but why is a QuickTime ID used ? Is this some sort of generic
fallback that ffmpeg uses?

Best,

Kieran.