Using gdata with channel or user

I am trying to use the YouTube API v2.0 to retrieve videos from a user account.

i was able to receive videos from this account

http://gdata.youtube.com/feeds/users/REMAXIntl/uploads?alt=json-in-script&callback=showMyVideos2&

but when i try to use this account:

http://www.youtube.com/channel/UC8dWY6fFXoqcMWPIqdN8JyA

I don't receive any videos. I think this may have to do with the url being different MEANING one points to users and one point to channels. I would really appreciate a nudge in the right different to resolve this issue. Thanks in advance :)