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AlphamaxMedia / netv2-fpga

Quickstart for building FPGA code for NeTV2
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[experimental-multires] Issues with 1080i #11

Closed plaes closed 5 years ago

plaes commented 5 years ago

When testing multiarch branch 1080i (commit e3514be72f) I ran into following issues:

1) One pixel shift of lines image

2) Garbled overlay colors (seems to always happen with one certain TV channel) image

3) Whole overlay shifted left after rebooting FPGA (~3 times out of 10 reboots). Sometimes reinitializing with 1080i command helps.

image

bunnie commented 5 years ago

Thanks for reporting these. this is actually three separate issues. Since they are all grouped together I will just cherry pick the most convenient one to work on and branch it to a new issue when I get the time.

bunnie commented 5 years ago

I think the most recent patch pushed should address the 1st and 3rd issues. The 1st issue for sure is fixed. The 3rd issue you might still see about an 8-pixel shift from boot to boot, but I haven't been able to reliably reproduce the problem. I think it's related to the fifo sync between the overlay and oncoming stream, and it seems rare enough I'll close this for now and we can open again in a separate bug if it's really an issue.

The color being off on a particular channel -- I haven't been able to reproduce that problem, but also, if the problem is due to color space being changed on a given channel by the broadcaster, there's nothing I can actually do about that because the colorspace info is encrypted and it would be a 1201 DMCA violation to read that out and adjust the overlay to match. So that bug may have to wait for the courts to decide this is a thing we should be able to do with our video.