> BT878-based cards to not have a comb filter and rely on a notch > filter to separate luma and chroma. That means that for any composite > input signal (NOT S-vid), they're limited to about 3MHz of luminance > resolution. That translates into 352x480 capture. Anything over that is > wasted space. Again, if used for s-vid, that is not the case.
I'd hate to disagree, since you clearly know what you are talking about, but I must. Either the theoretical numbers fail to match the practical numbers or some cards suck less than others because I've done some tests myself on this before and my bt878 card (ATI TV Wonder VE) tops out above that (on composite). I haven't done any extensive checking, but there is a difference between captures at 352x480 and 640x480. I'm sure the resolution tops out somewhere in between. Anyway, certainly the default MythTV setting of 480x480 is perfectly reasonable (and perhaps advisable) under most circumstances. -- Ian Trider [EMAIL PROTECTED]
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