3D Video Playback on non-3D / current TVs?

juw

Standard Member
Hi there,

I've been thinking about this for some time now, but my search for it sadly come up empty mostly (any pointers would be much appreciated!):

As to my knowledge, current TVs don't support neither passive nor active 3D Video Playback any more, instead raising screen resolution (4K and even 8K) and refresh rates (100Hz and more). It's probably a marketing choice based on little user demand, but I believe I can't be the only one deeply missing this feature. To mee the choices left is buying an legacy 3D TV secondhand, or an (rather expensive) 3D-Beamer, which personally isn't really an option for me.

Having been inactive in the HTPC-field for some time, I now understand that MadVR (in the days my most favored renderer - still kudos, madshi!) seems to be capable of 3D Playback by now, unless I misread newer forum entries. Given an 3D video file, my question is:

1) Would(n't) it possible to use such a renderer to seperate the given 3D-stream to left- and right eye streams respectively, or in some kind recreate the intended frames as whole seperated for left an right eye,

2) instead of streaming the standardized 3D Stream via HDMI (as I understand with the side-by-side or top-bottum "encoding"), composing a normal 2D HDMI-stream just multiplexing the alternating left an right frames, accordingly,

3) as current TVs normally support 50p and sometimes 100p next to 24p (which is standard to most movies), speed up the playback speed from 24p by about 4 percent to 25p - having to accept next to the movie speedup the resulting (slight) audio pitch shift - and then increase the framerate to 50p or 100p by displaying each frame twice or quadruple,

4) then send this 50p or 100p standard 2D-HDMI stream to a normal 2D-TV (this as said with alternating frames for left and right) for display,

5) and using 3D-Glasses with an external emitter devices such as the former Nvidia GeForce 3D Vision Kit (or equivalent solutions of 3D-glasses with an external USB-based transmitter) for synchronizing active 3D glasses at 50Hz or 100Hz for active 3D stereo vision?


Assuming an moderately jitter free 2D HDMI frame transport (i.e. that each frame is send to the TV in about equal time frames, such being presented to the TV "steadiley clocked"), the renderer could send this "frame clock" to a small programm controlling the external emitter.

In my understanding this 3D-glass synchronization software then "only" had to be selectable for the often L/R or R/L "confusion" (meaning to make sure it "starts with the right eye"), and due to the potential latency from sending the HDMI-Stream until it being displayed (e.g. next to the plain decoding time within the TVs chipset maybe also due to picture enhancement features or other alike) had to be adjustable for an according delay time concerning the switch impuls from the current to the other glass (meaning the switch from left to right eye and the reverse).


I may be missing something here, but from my naive examitnation to me it seems (rather easily) feaseable, and I presume a lot of other people had this thought before.

I used to be computer programmer myself, thus wouldn't shy away from dvelving into the details, but as said by quick search I couldn't find anything to cling on. Is there anybody of you being able to comment or lead me to the right direchtion?


Thank you for your time and stay safe and healthy!
 

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