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Posted by Jukka Aho on 11/25/06 09:57
DanR wrote:
> I see this "avi is only a container" mentioned many times here. At
> work we often encode (capture) to un-compressed AVI so we can freely
> manipulate the file using Sorenson etc. The un-compressed AVI file
> plays fine in Win media player. The encoding program is Digital
> Rapids Stream. We've never thought much about the actual process. So
> I'm wondering what codecs are involved.
Richard already mentioned GSpot for seeing what codecs are being used.
Note that "uncompressed" is not a single format, either: you can have
uncompressed video in RGB format, 4:4:4 YCbCr format, 4:2:2 YCbCr
format, 4:2:1 YCbCr format, 4:2:0 YCbCr format, etc. (All these formats
have their own FOURCC identifiers inside AVI files.)
In addition to that, there are variations _within_ these formats (for
example, not all 4:2:0 YCbCr formats place the color samples in the same
location on the sampling grid.)
It doesn't end even there: some professional formats may use 10-bit
samples instead of 8-bit samples for the color components.
See here for more information:
<http://www.fourcc.org/>
<http://www.fourcc.org/yuv.php>
<http://www.fourcc.org/rgb.php>
<http://www.fourcc.org/codecs.php>
--
znark
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