[Cin] wildest dreams: stream-copy and/or skipping avoidable pixel format conversions

Phyllis Smith phylsmith2017 at gmail.com
Thu Apr 23 23:45:18 CEST 2020

Simeon - important clarification concerning the following.  The code Andrew
references was removed from CV. IT HAS NOT BEEN REMOVED from the current
Cinelerra-GG, i.e. what you are using.  It does illustrate the use of a
second channel for the compressed data while maintaining the one channel
for the uncompressed data.  However, this code is of quite limited
applicability.   Phyllis/Bill

Hi Andrew,
> >
> > I think this was done in old Cinelerra for some DV variants and mjpeg
> (in mov and avi)
> >
> > In old CinelerraCV it was removed in commits
> >
> >
> https://github.com/cinelerra-gg/cinelerra-cv/commit/8364fc6af3eb9b105ecf0853f79885090b12005f
> >
> https://github.com/cinelerra-gg/cinelerra-cv/commit/0ff51f4c53e17ff33701e8cc1096de33a87313b9
> >
> > I remember this because I tested this (mis)feature, and found it working
> for
> > mjpeg avi (so i was not convinced by this reasoning and just keep my
> copy at commit before this :E)
> >
> >
> https://git.cinelerra-gg.org/git/?p=goodguy/cinelerra.git;a=blob;f=cinelerra-5.1/guicast/bccmodels.h;h=28b58459fb74eabb72e3fbf74f371ea51786cd18;hb=HEAD
> This is a very interesting finding, and something I was not aware at all.
> So thanks for bringing this piece of history to my attention!
> ..
> Maybe Einar can give additional details concerning the circumstances of the
> removal?
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