I use DVHSCap to pull HDV footage off my HV20, and it usually goes great. I can then neatly store my source footage in .m2t files, which I can later convert into an intermediary codec, etc.
However, I've stumbled across an .m2t that seems to be damaged in some way. I cannot use NeoScene or any other conversion program (tried ClipWrap too) successfully on it. The only thing I can do with it is view it in VLC. It has a couple strange visual blips in it a couple times, most noticeably right at the beginning. Anyway, at least when I view it in VLC it can play all the way through and the audio/video stays synced up. But no matter what program I use, I cannot do anything at all else with it, so the file is basically useless to me.
I've been reading stuff on Google, and someone suggested using MPEGStreamclip to re-write to a new stream, but it requires the Apple Mpeg2 playback component, which costs $20. Any other suggestions? VLC actually is capable of exporting the stream, but it's not producing anything that includes the video track for some reason.