On Sat, Dec 8, 2018 at 12:38 PM Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 2018-12-08 13:10 GMT+01:00, Kieran O Leary <kieran.o.le...@gmail.com>: > > Hi Carl, > > > > > > On Sat, Dec 8, 2018 at 11:00 AM Carl Eugen Hoyos <ceffm...@gmail.com> > wrote: > > > >> 2018-12-08 11:46 GMT+01:00, Kieran O Leary <kieran.o.le...@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 :( > > I don't think it's fine: You are using a very unusual fourcc to put > something > in matroska that is not meant to be there, expect massive compatibility > issues. > Good point. > > >> > 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? > > Just like the V_MS/VFW/FOURCC codec id above for avi, there is > also a QuickTime fallback defined for Matroska (not by FFmpeg), > tiff happens to be defined for QuickTime but not in avi, therefore > the QuickTime code point is used for Matroska. > Contrary to dpx above, this can at least be argued to be following > some standard. > This all makes sense to me and it's incredibly helpful. I see the TIFF mapping in the QuickTime spec now. So I guess that TIFF, and DPX need to be mapped in the Matroska specification? Best, Kieran. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".