E Chalaron wrote:
Just to complete :
When you work with film scans you need to be able to create 10 bits 444
quicktime files or uncompressed RGB
That's an interesting point. I tried a YUV4MPEG stream with mplayer,
which complained that it didn't recognize the stream tag C420jpeg (but
played the clip OK). So this is a hint that a previous remark is
probably correct about YUV4MPEG giving 4:2:0.
Now I wonder why a 10 bits 4:4:4 file is needed. If it's a matter of
image quality, you're going to lose it in the internal engine, which
works in 8-bit space (I tried to edit Canon 500D footage under
RGBA-FLOAT and got a black screen).
But if we're at it, YUV4MPEG inherently includes a conversion from RGB
to YUV (anyone here running YUV as the internal colorspace?) which the
piped-to encoder may not take advantage of, and convert it again to
something else. This is where bit resolution is slowly eroded. So if
there's anything I would be glad to see in this field, it's the ability
to render to an uncompressed RGB output (Maybe AVI?). Not that I'm sure
whether encoders other than mencoder accept that.
Eli
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