Question about x264 and avisynth 2.6

[jpsdr]

I'm working with avi files encoded in lagarith YV12, and lagarith codec configured to not upscale ouput.
I've installed avisynth 2.6 alpha 2.

Until the last version before 1376, when i encoded an avs file with inside AVISource(""), no message about converting.
But, if i encoded directly the avi file (when option have been added recently), x264 says it convert the video to YV12. This have been explained, so, ok.
But, now, with 1376, even with an avs file, x264 says it convert to YV12 !
So, i'm wondering several things :
- Will this be fixed in the future ?
- What is the effect on the video, wich is already on YV12, to be (re)converted to YV12 ?
- What is the impact on the speed ?

Thanks.

[JEEB]

ConvertToYV12 does nothing if your picture is YV12 already.

Also, this is done because AVS2.6 outputs all of the YVXX formats as "YV12" for 2.5-based apps (marks them as YV12 for compatibility reasons), therefore you'll need the ConvertToYV12 in there to make sure that AVS2.6 is outputting YV12 to you (the app, x264 in this case) at the end of the line.

So, nothing to be fixed here until 2.6 gets out officially and it can be used as the base.