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show/merge two or more PAL videos on the same screen

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Capturing a slow scan, single-bit resolution, heavily pixelated TV signal, is not the topic of your original thread.

Your thread is about mixing two non-genlocked video signals together.

The keywords here: non-genlocked video signals together.
 
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Agreed, there is a world of difference between a single bit mapped at 128x96 resolution and a typical 8x8x8 bits at 720x576 resolution. 17,280 times more data to process in real time to be precise, and that is just for one picture and no frame store. As a guess I would say you need to buffer at least four frames to be able to 'slide' them then a buffer to merge them.

An Arduino UNO clocked at maybe 4Ghz with around 2Gb of memory might just do it if it had enough hardware support around it.

Brian.
 

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