TV card suggestions?
Reply #14 – 2002-11-30 04:41:42
Oh, just to let you know, my WinTV is the 404 model, its based on the Bt878 chipset, fully supported in open OSes, never had problems capturing at full 640x480 at 29,97 fps (ntsc) (after switching to win2k from win9x, that is). I have a dedicate 60GB Maxtor HD to do the captures, using Huffyuv it gives about 3 hours of capture time (with 48khz stereo pcm audio). While the card has its own tuner, i don't actually use it, neither its mono sound. I simply have a VCR with stereo tuner hooked to it, the audio goes to the sound card. I read somewhere that due to cabling and noise in analog captures, its imposible to discern anything beyond 384 pixels of horizontal resolution (even with s-video/ or separate rgb "combined" cabling). Capturing at 640 and later resize (precise bicubic/bilinear) can help reduce the perceived video noise a bit. Vertical resolution is another matter, 240 will simply pick one of the two interlaced frames. Make sure you _dont_ use overlay display when capturing, preferably turn off any preview display in real time capture. 480 gets both fields at their intervals. In pal you have more vertical resolution (576?) and lower framerate (25). In the past i used to lose about 1 frame per minute. When i switched the capture drive to a 7200rpm HD, this value decreased to something like 1 frame lost per 30 minutes, or so I have tested many other WinTV cards and all seem to capture just fine, even the 50$ model (Win TV GO PCI). They seem to use the same chipset anyway. I also don't like any lossy compression applied in realtime (hardware or software), as you will lose the chance to apply filters, corrections, etc without further decreasing the quality. Of course, this means huge disk space, i simply dedicate an entire hard disk for capture and editing. USB devices... Yuck! Usb1 is only 12mbps anyway, im hitting 130~150mbps most of the time (mind you, thats PCI bus transfering 32 bits at 33mhz, whose theorical limit is around 1056mbps) I don't want to even think about USB1, USB2 at least has 140mbps... If you use digital equipment (ieee 1394) you don't need analog capture at all, only digital transfer with any ieee1394 aka firewire) card. Some digital cameras use 4:1:1, check your reds for blockiness