Hi Terry
Not sure if this is relevant to your intended application, but on a "slow & old" computer I once had a TV Tuner card that relied on software and the system CPU to perform all the processing and I used to lose video/audio sync, as well as get dropped frames.
Once I upgraded to a TV Tuner card that did all the grunt work via hardware onboard the card, all was well and I could use the same computer to perform tasks whilst it was also recording a TV program to the hard drive. It was a 2001 era P4 1.8 Ghz with 512M RAM.
Cheers
Dennis
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