[Libquicktime-devel] [PATCH] Set vendor to "appl"

[Joseph A. <jo...@mi...>]

Yet another Avid Media Composer compatibility patch.

I've noticed that some of the files generated by libquicktime produce a 
colorshift when loaded into Avid in AMA (as opposed to Import) mode. 
Further investigation revealed exactly what was going on:

Avid calls FindNextComponent()  from Windows QuickTime API in order to 
query its supported output formats. FindNextComponent() allows querying 
by component type (image decoder, sound encoder, ...), fourcc, vendor, 
or any combination of those. As you probably guessed by now, Avid 
includes vendor in the query. As a result, it's unable to query the 
decoder for its supported output formats and defaults to 8-bit ARGB. On 
files produced by Apple QuickTime libraries it finds some supported 
YUV-based formats and asks QuickTime to output that, converting to RGB 
later on its own. Now guess what, with some codecs the result of 
QuickTime doing YUV to RGB conversion differs from Avid doing the same!
I don't really care which one of them is right, I only care that files 
we produce with libquicktime are visually indistinguishable in any 
software from files Apple QuickTime libraries would produce.

Therefore, a patch is attached changing vendor from "lqt " to "appl".

P.S: Also please apply my previous patch.

-- 
Joseph Artsimovich
Senior C++ Applications Developer
MirriAd Ltd