Ken is correct - what you see may not be what you think that you should hear. I have a lot of live concert DVD & BDs & often you will see a drummer/percussionist for example doing something but it is not audible or is perhaps very low in the mix - at other times it will be fine.

There are so many channels fed into the mixing board in these recordings that I believe that mixing is often the culprit & things get missed. Not saying that this is your situation, but it is something to keep in mind...

TAM