In order to digitalize video tapes (K7) recorded with a camcorder, I used a SCART to hdmi converter (I think it's this model https://www.amazon.co.uk/Converter-Upscale-Adaptor-Monitor-Projector-Black/dp/B08HVNYH4X?&linkCode=ll1&tag=bluecine-21&linkId=2524a257eefa7b5f01ed7778adf49231&language=en_GB&ref_=as_li_ss_tl), in between my VHS tape reader and an hdmi to usb acquisition card.
This work nicely to record Disney tapes, but if I use instead a K7 recorded from the camcorder, I get from the SCART to hdmi converter a blue screen with a "no output" message (if my memory is good). I tried to plug the scart converter to an hdmi screen directly, same message. However, I tried to replace the SCART converter with another SCART to HDMI device (actually it's a device used to record scart or hdmi inputs to a hard drive to save them for later use… but for some reasons I don't have access to this device anymore) and it's working…
Any idea why my original SCART to HDMI converter is working only for Disney tapes but not for manually camrecorded tapes?