Tue Aug 02, 2016 9:21 am
Back in the 90s I used to work on AV presentations, product launches and shows etc and we often had to integrate the output of a PC or Mac into off-tape and live camera outputs via a vision mixer. We used a little box that took the PC's "pseudo-PAL" output (reduced resolution and frame rate as Adam suggests) and converted it to regular PAL composite before being given to the mixer or switcher. Even then, we would have sync problems when switching or mixing which required timebase correction or genlocking somehow. I forget which device/s were used, unfortunately, but I reckon a deep eBay search might throw up something.
Blackmagic Teranex 2D, Ultrastudio Express, Intensity Shuttle (Thunderbolt), Two H.264 Pro Recorders (Mac OSX) & lots of old VTRs used for digital archiving of legacy video formats for major libraries, broadcasters, universities and public archives.