Getting Vsync from HDMI possible?

[Ludvig]

Hi There!

I have a project where I want to sync a motor to a video cameras shutter. I have done this quite easily before on Composite and VGA video which has a easily obtained VSYNC. I have not yet found a way to get the "vsync" from hdmi video. Is this a pipedream or is it possible? How does it work for 3d? How do you get the sync signal from HDMI to trigger the glasses?

Any tips is welcome, it doesn´t have to be cheap solution.

Best Regards

Ludvig

[geekmaster]

If you want to practice some HDMI hacking skills:

http://hackaday.com/2014/01/25/reverse- ... -extender/

http://www.gadgetfactory.net/2013/02/hd ... into-hdmi/

https://media.blackhat.com/bh-eu-12/Dav ... DMI-WP.pdf

http://www.slashgear.com/basic-tv-hack- ... l-0258855/

http://www.bunniestudios.com/blog/?p=2117

I have one of bunnie's HDMI hacking devices, and you can buy one here:
http://www.adafruit.com/products/609

https://www.youtube.com/watch?v=3TuCrd8Kvus

You should be able to extract VSYNC using these methods.

It may also be possible to use an HDMI splitter with an HDMI/VGA convertor and get VSYNC from the VGA socket. This $6 adapter also puts out composite video and audio:


http://www.ebay.com/itm/HDMI-HDTV-to-VGA-3-RCA-Converter-Adapter-Cable-1080p-/170501674361

[Ludvig]

Thanks a lot for your reply!

I will dive in to the links you provided pronto.

The cable you linked to seems to be of the "dumb" sort. Since my source of hdmi is a camera(bmpcc) there is no trickery I can perform on that side. Would i not need a active adapter? My videosignal is 30P, so it is also a problem that vga is usually 60hz. I will get twice the amount of pulses and no way of telling which is in between the camera exposues. Basically I need to get a ttl level pulse everytime the camera takes a picture, 30 times a second from the hdmi signal.