mpeg2 encoders' internal colourspace

[45tripp]

I remember from old that TMPG would encode in rgb24 and CCE in yuy2.
I have no reason to think anything has changed.
All mpeg2 encoders are restricted to doing their processing in a single colourspace?

So it's HC in YV12, TMPG in RGB24, CCE in YUY2, Procoder in YUY2 (I assume from recent discovery).
What about Mainconcept. YUY2?

I tried looking for solid info. But really found nothing.
Perhaps someone with the knowledge could let me know.

ty

[edDV]

I think you mean input formats to the encoder, DVD standard is YCbCr* and 4:2:0 for all or it isn't a Video DVD.

*YCrCb is the color space defined by Recommendation ITU-R BT.601

[BJ_M]

depends which mainconcept SDK supplied program you mean -- in some of the programs that use the SDK from MC, you can switch the input color space

[45tripp]

I'm not talking about video formats.
I mean in which colourspace the encoder actually procceses data.

As I understand it, an encoder encodes in a single colourspace. True?
TMPG for example does it in RGB24. So If you feed it a DVD compliant mpeg in YV12
it will convert to rgb, finish it's encoding, and convert again to the colourspace the
output video format requires.
At least that is the information I found in the past; I haven't found anything
new that suggests otherwise.

depends which mainconcept SDK supplied program you mean

standalone

-- in some of the programs that use the SDK from MC, you can switch the input color space

which ones?

[edDV]

The mainconcept standalone supports lots of input formats directly or through directshow filters. Best to get the demo to see all the options, but it will convert RGB24 if that is your concern.

http://www.mainconcept.com/site/index.php?id=4
http://www.mainconcept.com/site/?id=825

Import description
http://www.mainconcept.com/site/index.php?id=824

It is possible for editors or encoders to internally convert YCbCr to RGB24 with compensation for 0-255 or 16-235 if the correct math is used. Vegas and Premiere seem to get it mostly right regardless of internal RGB or YCbCr internal processing. I use the waveform monitor to watch for transcoding errors. I wish other programs gave some kind of graphical levels feedback.

[45tripp]

My concern is, what obligatory internal colourspace conversions happen to my source once inputed into the various encoders.

[edDV]

My concern is, what obligatory internal colourspace conversions happen to my source once inputed into the various encoders.

What source? What is your concern?

Output from the DVD MPeg2 encoder will be 8bit 16-235 luminance 4:2:0 YCbCr.

[BJ_M]

which ones?

The Sonic "CINEVISION" encoder uses the main concept SDK in fact for it's mpeg2 (and h264) encoding engine .. it has the ability to select the source colour space and do internal conversions accordingly.

It is also about 15 grand - and can do selective re-encoding of any gop/frame(s), chapters or section based on user defined criteria based mostly on PNSR. It will also take direct 10bit SDI fed input. It comes with the DTS-HD encoder and also the dolby encder for HD-DVD and blu-ray .... It is designed for use wit the scenarist advanced content authoring system ...