<< Playing with PowerVCR II, I found out in the supported cards section that both Avermedia and Winfast sport the same BT878 chip (and also the same as Win TV theater and many other cards). Also I dont know with Avermedia, but with Winfast - powerVCR has a channel preview option, where it opened about 16 channels at the same time, however it cant tune them all at the same time, so it just captures a frame, and then moves to the next channel. Those who got Avermedia- could you confirm that Avermedia features a smooth playback of all 16 channels at the same time? Because otherwise it is not a usefull feature and through PowerVCR it is supported on Winfast too. >>
Unless the card has 16 separate tuners, you ought to expect the same thing. Back in high school, one of my friends had a huge screen Sony TV, and it had a similar channel surf option. It behaved the exact same way that you are describing. It would tune one of the channels for a split-second, then move on the to next channel. I suspect it could be done better, but I believe there's a big enough delay when channels are changed, that it couldn't be improved very much, and certainly not so that all 16 channels appeared to be tuned simultaneously.