ConvertToYV12() and BluRay backups

[ubertoast]

I am starting to backup my blurays and have been reading up since it is different than backing up DVDs. I see many guides saying to use the ConvertToYV12() command in the avs script. I was wondering if it is necissary and why it should/should not be used.

So far i have been using dgavcindex to create a dga which i then load into avs script creator (megui). But i have not been using ConvertToYV12() until i started reading up.

Thanks for any input.

[thewebchat]

Simple answer: The guides are useless. BluRays are already in YV12 so there is no need to convert to it.

[ubertoast]

Haha thats what i sort of gathered from all my reading. Thanks :)

[Blue_MiSfit]

In some cases decoders will output YUY2, so even if the sources are in YV12 (which all of them are), the decoder may upsample the output.

This is fine for playback, but less than ideal for re-encoding.

Just make sure your script is outputting YV12. If it's outputting YUY2 you have a decoder problem. DGAVCIndex will always return the proper colorspace :)

~MiSfit

[ubertoast]

How can i tell what colorspace the script is outputting?

[kemuri-_9]

use info() in the script and it'll tell you what colorspace the video is at that point in time (among other information about the video).

[Alex_ander]

I see many guides saying to use the ConvertToYV12() command in the avs script.
Some mpeg encoders are optimized for YV12 input (like HC Encoder which even doesn't work with other colour spaces), other ones may prefer YUY2 (like CCE and Canopus) or even RGB24 (the old TMPGEnc).