Posted by DanR on 11/25/06 16:07

Jukka Aho wrote:
> 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


Thanks guys for the info. I'll have to dig into the settings of the encoding
application to see what user settings are there. We mostly encode directly
from Digi-Beta or Avid (SDI) but sometimes component and composite.

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