Recording hd video on iphone 4, better in imovie app, or desktop?

Question

For some reason, my imovie recordedo on my iphone and imported looks worse on the desktop version than on the app. Anyone know what parameters or settings should be used to import the iphone 4 hd videos into the desktop version? I would rather use the desktop version, but the app version looked perfect. Also, if you shoot widescreen, the app version doesn't care, however the desktop version squeezes the picture really wide. Anyone have any remedies for this?
alan

Answer 1

Thanks for your reply . I've removed the cover when doing both tests I mentioned. The earphone I used is at good condition and I don't see any problem with it. I've also reinstalled the iOS as your instruction, but still no luck, the video sound still has noise.
I've decided to export the video file to my PC to see if I can hear sound better or not, as it's hard to hear and sound except noise with the external speaker on my iPhone even at maximum volume. On my PC I had to increased playback volume to 100%, set volume booster to 300% and applied noise reduction plugin (I use Media Player Classic on Windows 7) to get an acceptable sound (still noise but better than the original). If I don't boost the volume, it's hard to hear anything. I don't expect it to be crystal clear like the voice memo (using the bottom mic), but too much noise like this is really bad.
So I think it appears to be a hardware-related problem. I will later consider to send it to a phone repair shop or keep it and accept this bad video sound problem . In Vietnam we just have Apple authorized resellers but don't have any official Apple repair shops, that's why I'm still confused as I don't really trust those phone repair shops to handle my iPhone. Anyway, thanks again for your comment .
P.S: it maybe a little off-topic, but do you know any video recording app that using the bottom mic ?