Need Compress Video Codec

[mlong30]

Hi All,

Is there a compressed video Codec that has a RGB colorspace or RGB32? The only one I'm aware of is uncompressed.

Thanks.

Matt

[pchan]

PICVideo MJPEG can RGB and fast too.

You can see all the codecs list here.

https://www.videohelp.com/tools?s=6#6

[mlong30]

I need for it stay in a AVI file.

Thanks.

Matt

[jagabo]

Lagarith has RGB modes. So does MSU Lossless Video Codec.

[mlong30]

Lagarith has RGB modes. [/url].

I'll try Lagarith. I'm using the NeatVideo filter which uses RGB32. So I'm compressing to a uncompressed file which takes up 125gig for 1.5 hour video. Then I want to add lower thirds to the video in Sony Vegas, which it requires RGB, but I may need to run other filters using the YUY2 colorspace, so I'm trying to just go from RGB to YUY2 just one time, so I don't loose picture quality.

Correct me if I'm wrong, but I read some of the notes for Lagarith, and I believe it said that I can go from one colorspace to another without loosing quality. I there a certain limit that I will start to loose quality?

Thanks.



Matt

[pchan]

I need for it stay in a AVI file.

Thanks.

Matt

Indeed. DV-AVI format. Another option for you is huffy codec. I use Picvideo MJPEC codec. 1 hour of video is about 13gig.

[jagabo]

Correct me if I'm wrong, but I read some of the notes for Lagarith, and I believe it said that I can go from one colorspace to another without loosing quality. I there a certain limit that I will start to loose quality?

There is always a loss of precision when converting integer RGB to YUV and back. Not every integer RGB color has a unique integer equivalent in YUV space, and vice versa. So converting from RGB to YUV and then back to RGB will not restore the original RGB values exactly.

In practice, a single RGB -> YUV -> RGB cycle won't be noticeable. But several repeated cycles could become visible. So there has been some work with algorithms that keep successive conversions from losing more and more precision. This may be what you've read about.

In addition to this you have black and white level issues. Dark areas of a very underexposed YUV video (where some detail could still be enhanced if left as YUV) will all become completely black when converted to RGB (you'll never be able to get any detail back). Overexposed areas in YUV will all become completely white in RGB. If you're going from RGB to YUV this isn't an issue.

I don't have HuffYUV installed anymore. I don't remember if it has an RGB mode. I seem to recall that it always converted RGB to YUY2 and then compressed that. On decompression the YUY2 is restored and converted back to RGB if necessary. If you work purely in the YUY2 colorspace the codec is lossless. But when feeding it RGB you will get losses because of the aforementioned conversion issues.