Hacking THP video format conversions..

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I'm trying to convert a .thp video from the wii, into AVI, although i've managed to do that with MediaCoder, the sound isnt sync with the video.
Anyone knows how to fix this?
Also, is there a way to convert it back to .thp again?

i've been searching like mad for something like this, and so far no sucess.


update
Oks i've managed to Sync the video with the audio (although quality did suffer). But now i dont know how to convert back to .thp do add again to the ISO