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btwincap works well under xp and in many case better and give more option (for example analog sharping filter before AD-converter) than orginaldriver from tv-card manufactory.
I also using virtual dub for capturing, but if you want capture TV in 720x576 50 Hz (or 640x480 for 60 Hz TV) resolution without frame loss, you need PICvideo MJPEG codec for first capure round, yes, is commersial (realtive cheap price), but very hard to find other well working software real time compress-program for TV-capture.
Forget all Divx/Xvid or most other codec you can find inside windows, this take for much resources (and give mostly terrible quality) and if even i look good on TV:s test picture, is give unusable result with lot of drop frames in action scenes (actual on divx/Xvid)...
You can also try lossless huffyuv-codec, but needs very good bandwidth to huge sized harddisk (compression 2.4 compare to orginal size and dataflow around 10-15 Mbyte/sec).
If use PICvide MJPEG in quality '18' make 10 GByte data per hour ('19' give 18-20 GByte/hour but give very, very near orginal visible quality), with huffyuv possible around 40-50 GByte per hour.
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I check now codec package ffdshow (https://sourceforge.net/projects/ffdshow/)
seems worked without fuzz if you select mjpeg or huffyuv and 'eat' 50% CPU on 3 GHz machine (PICmjpeg take around 25-30%)
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uncompressed you have around 33 Mbyte/sec data flow (around 116 Gbyte/hour) and is difficult to make windows handle properly even on (very) fast disk without interference to capture process. Is very easy make part of seconds block of frame drop time to time in moment on flushing filebuffers, seeking , open new explorer etc. windows internal housekeeping operation...
You have no margin without compression and simple mouse movement can give 10 dropped frames straigth even if you have 3 GHz computer...
Forget external USB-disk in this high datarate, take for much resources in wrong time for USB-handle in OS and interference capturing process, but possible working better on IEEE 1394 (firewire) ie. mostly DMA-driven management.
windows high priority random using of resources is a hell and inteference with capturing process and compression time to time (must be done every 40 ms or 33.3 ms straigth) and practical CPU load need lower than 50% for succefull drop free TV-capture.
btwincap is only driver and interface for other program to videocapture card - not application to record movies or picture - possible you can find small application etc. in btwincap software package/home page, but I not remember...
Is depend of used capture software, many of them can search inside stored video record and export picture as BMP or simular format. you can possible using CTRL-alt-Print Screen on streaming video capture window (but not in overlay- display mode) and paste in paint etc.
720x576 window is not so big window in 1024x768 or 1280x1024 display mode, so you can take picture with full TV- resolution.
Easiest way is record whole movies, soccer etc. in full quality and resolution and after in peace and quiet select out wanted picture and export - use huffyuv for lossless compression in capture moment (needs BIG harddisk), if you accept sligty near invesible quality loss, use MJPEG with high quality setting (smaller filesize compare to huffyuv).
try virtualdub if you need free video edit tools include capturing video.
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