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i want to convert my AVCHD files to either H.264 or AVI? which one is better when it comes to video quality?
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AVI is a container format - i.e. it contains video and audio streams. H.264 is one of many video formats that AVI can contain.
Here's a Wikipedia article on the various container formats and their capabilities:
http://en.wikipedia.org/wiki/Comparison_of_container_formats
i have this video converter that can convert M2TS to HD file formats.. but under the category of HD Conversion, there are lots of different kind of HD outputs..
there is HD-H.264, HD-MPEG4 & HD-AVI... so.. among these.. which is the best?
It's still the case that AVI & MPEG4 (HD or not) are containers, whereas h264 is just the video part, i.e. no audio. As far as I know, there are no true formats called HD-H.264, HD-MPEG4 & HD-AVI. I'd imagine that the HD prefix just means that you'll retain blu-ray image resolution and possibly audio quality.
So you still need to find out what video & audio formats those options include and also you'll need to check what your TV or blu-ray player (I'm assuming you'll be playing them on one of these as you're in this forum and talking about HD) can accept. Or you could just try a disc converted in the various options and see what works for you - there's a lot of personal preference when it comes to video & audio!
I use DVDFab and rip my blu-rays to AVI with h.264 video and AC3 audio (my TV - grrr - doesn't accept DTS or any HD audio). I could also choose the MKV container with the same video & audio, but for me there is no advantage in doing this.
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