How are you creating the 64-bit GWorld? 'QTNewGWorld()' with
'k64ARGBPixelFormat' works on both Mac and Windows.
How are you testing the bit depth? By convention, for all direct-
color representations, regardless of the actual precision, the
'depth' field of the 'ImageDescription' is always set to 32 if
there's alpha, 24 if there isn't. The 'cmpSize' field of the 'PixMap'
will give you the correct component precision, but note that, by
convention, the 'cmpCount' field of the 'PixMap' specifies the
logical, not physical, number of components, and you may need to set
it to 4 yourself if you want to see the alpha channel. To determine
the actual precision of a pixel, use 'ICMGetPixelFormatInfo()' and
look at the 'bitsPerPixel' field of the 'ICMPixelFormatInfo'.
How is it possible to read QT movies compressed with 10 bit and 16
bit (PER CHANNEL) codecs?
I have working code to read QT movies uses 32-bit GWorlds (and
GetMoviePict). I tried creating a 64-bit GWorld (on QT for Windows)
and it failed.
I also have a 10 bit 4:2:2 uncompressed sample movie, and when I
query its sample description (again using Apple sample code), I see
the bit depth is 24 bits. It should at least be 30 bits, and I
would expect to "render" it to RGB using a 64-bit GWorld.
Can someone help me make sense of this?
Many thanks!
--
Paul Miller | email@hidden | www.fxtech.com | Got Tivo?
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