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Why is VirtualDub software unable to capture a frame with more than 288 pixel rows in PAL mode (or 240 pixel rows for NTSC)?

April 26, 2017capture frame mode PAL pixel rows Software virtualdub

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Why is VirtualDub software unable to capture a frame with more than 288 pixel rows in PAL mode (or 240 pixel rows for NTSC)?

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VirtualDub, like any other VFW based software, uses a so-called wrapper to translate VFW calls to their counterparts in “DirectShow/WDM world”. This slowdowns your PC a bit, and the wrapper grabs only one TV signal field. This results in only 288 lines for PAL/SECAM and 240 lines for NTSC. I think it would be possible to modify their wrapper to solve this problem but unfortunately I do not have the free time and special equipment needed to work on it.