Martin,
Some editing is usually required between shooting a gig with a video camera and uploading it to Youtube. To begin with, it is good to 'top and tail' your clip with a fade-in and a face-out from black. If you are including more than one number, you would probably wish to trim the gap or gaps between numbers to give a smooth performance.
In the DVD of Pipeline 2011 when your band played as the Instro-Mentals, you will notice how
all the bands seem to be able to slide from one number to the next in a matter of seconds, with none of the pauses, tuning checks, even guitar swaps, that all take up time in a real gig. This illusion does not happen by accident! Alan Taylor and I often spend as long 'invisbly' shortening the gaps between numbers as we do editing the number itself. For a 1-hour set we have often taken out as much as 10 mins of inter-tune gaps. The video would not flow so well if we left it as 'real time'.
As Didier says, if you only use the camera mic, you will never get very good sound. Also, if you only have one camera you will be restricted either to a continuous wide shot of the whole band, or a 'wobbley-cam' video if you ask someone to hand-hold the camera and zoom in and out. And what if someone makes a mistake in a live performance?
So what is the alternative? One answer is to abandon the idea of recording a live show and instead make a music video the way that music videos are usually made. Start by pre-recording your track. That way you can make sure the sound will be really good. Then play back the track to the band and record a wide shot showing everyone in the band playing (this is the master recording). Now record the necessary closeups and cut-aways. If you are not sure at any stage who was doing what, then you can check by looking at the master. Since you do not have to actually
play your instruments (because you are miming to the track) you can make sure that all your movements and your smiles, etc, are perfect. Also, you can clear the playing area of a lot of the clutter that you would have to use for playing live.
Having said all that, what camera to get? The first thing to say is that your camera will need a tripod to get steady shots, so factor in that cost. HD is normal these days, as is recording on to an SD card. If you pre-record your track, you won't need to worry about an external mic input. Here's an example of the sort of camera that I'm suggesting
http://www.maplin.co.uk/1080p-hd-camcor ... oom-503266I can't recomend it from personal experience because I've never used one, but it has the sort of features that you will need and the Maplin chain is country-wide, so you should be able to look at one and maybe even try before you buy.
Ray