VIVO has both Video-In (usually use a vcr, camcorder, sat receiver or tv to
feed it a signal, generally using rca jacks and composite connection) and
Video-Out (TV-Out, generally composite and/or SVHS cable). Note you can use
a vcr or sat receiver as a substitute for a receiver if you want to
watch/record tv. They usually depend upon your sound card for the audio
part.
TV-In/Out besides usually including the video-in and Video-Out above also
adds a software tv channel tuner. Having the tuner tends to add some
flexibility to the video input (assuming cable tv), e.g. might have
pic-in-pic, thumbnails of multipule channels, record one while watching
another etc. etc. Sound is handle by the tuner when watching tv and (I
assume) use mixer and sound card to feed audio if/when using Video-In, e.g.
composite in.
In my case, rural area, no cable, just sat so VIVO's fine.
I should note I'd recommend a fairly modern beefy pc if you want to record
at the best quality and not drop frames. Just watching and capturing the odd
frame (e.g. snapshot) demands little.