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Published 20 hours ago • verified publisher icon oyvindln

Sync locking fails on 240p/288p type signals and other non-standard vblank

Open oyvindln opened this issue 3 years ago • 2 comments

Issue for both cvbs-decode and vhs-decode.

oyvindln avatar Apr 19 '21 16:04 oyvindln

Current code only looks for a standards-conforming line of eq/vsync/eq pulses. Dropons on a field is usually okay due to guessing based on previous vsync, but we get issues with samples where the vblank area is abnormal like "240p/288p" type signals.

Maybe a first fallback could be to do something based on pulses longer than some set length since it will have to be present in some form for a CRT to display it.

oyvindln avatar Aug 03 '22 17:08 oyvindln

--fallback_vsync option does this for vhs-decode now. Causes some sync issues on the crafters sample that at least needs to be figured out before making it standard.

oyvindln avatar Jan 05 '23 20:01 oyvindln