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#15368
marqs
Participant

VSM value in PAL mode = 0, VSM value in NTSC = 2.

Non-interlaced sources with odd field flagging (VSM=2) are problematic for the digitizer chip which explains your behavior. A workaround is to temporarily switch to a non-interlaced mode with even field flagging (VSM=0) or to an interlaced mode (PAL and NTSC both fine). VGA is another option (H+V or C sync) but it has other drawbacks.