Lagarith Settings for uncompressed YUV 4:2:2

[mayhampixi]

So i have just started capturing all my old Video 8 tapes.
I have captured them with adobe cs5.5 uncompressed YUV 4:2:2

I am just looking to store them, so not editing them yet and want best possible quality but smaller size than 120GB.
I have read alot of information.

Some people say export RGB and its the best but a memory hog, also that you can then specify the proper matrix in avs script later when editing.
Others say YUY2 and then there is YV12 and RGBA which i still dont know about.

I really dont know the difference and have made the effort to find out but cant seem to get an answer at the moment i have 10 windows open that sort of explain it but not.

So i guess by reading what i have RGB or YUY2.... what do u recommend and why.

then there is the option to prevent upsampling when decoding ( which will force the codec to decode the video in the same colourspace it is stored as internally, it might improve performance but might not be compatable with some programs????

and null frames,,,,, by the description i dont need this checked...


So what settings do u guys use for Video8 or VHS?

THanx!!

[zerowalker]

From what i learned, YUV2 is the best to capture with, as RGB means it will probably upsample as the source doesn´t support it aswell as capture card.
So capture at YUV2, and then do what you want with it, if you compress it will end up as YV12 (if you don´t use x264 with some special settings).

EDIT: There is also lossless compress, as lagarith and the like, which support yuv2 or rgb etc, they don´t force it to YV12 if you don´t tell it too.

[jagabo]

Compress with Lagarith in YUY2 mode. Conversion to RGB is not lossless.

Disable the "Always suggest RGB for output" settings. You want to leave the video as YUY2 whenever possible. When a program asks the codec to decompress a video they negotiate the colorspace. If you enable this feature the codec will give priority to RGB output -- which is what you want to avoid.

It doesn't matter if you enable or disable Null Frames -- the program only uses null frames when one frame is exactly the same as the last (ie, "repeat the last frame" rather than compressing the new frame again). That will never happen with all the noise in an analog capture. Some programs may not handle null frames properly (they skip the frame rather than repeat the frame, causing loss of sync with the audio).

Enable the multithreading option if you have a multithreaded CPU. It will run faster.

It doesn't matter what you set "Prevent upsampling..." to. That only effects the decompression. You can always change it later if necessary. With YUY2 data being compressed in YUY2 mode the only upsampling that will happen is when the program outputs RGB to programs that only accept RGB data.

Be sure to use a program that doesn't convert your YUY2 video to RGB before sending it to the encoder (some editors do this). VirtualDub is good for that.

General info:
http://en.wikipedia.org/wiki/Chroma_subsampling
http://fourcc.org/yuv.php#YUY2