Originally Posted by crunchy3d
I still can't understand. My LG 4K 3D passive TV can play squeezed side-by-side or over-under files from USB key. Do you want to say that if you play full resolution over-under files (on USB key), the TV will show it in the correct aspect ratio? This is surprising. Are you sure? If you have passive 3D TV you can't get full vertical resolution anyway.
By the way, I don't plug in the USB key, but large external disk, instead.
I will have to test USB stick again, I did test it before with full HD and I remember it worked, I will let you know results. If your source is full HD (1920x1080) you could encode it to either SbS full or T/B full and play it on a 4K passive in full HD per eye, doesn't make any difference you can get full HD on passive 4K that way, enough pixels either way to support the resolution. I downloaded your second GoPro sample (3840x1080p h.264 .mp4) from YT. I played via VLC from Mac Pro to second screen LG 4K and it is displayed in full 1920x1080p per eye on my screen, no black bars.
I have VLC setup in prefs. to auto play on LG and in full screen. I did have to enable 16:9 AR in video prefs so that the black bars are removed. I also ripped a 3D Blu ray movie again and tested that. I used t/b full which produced 1920x2080 (it was a 1.85 AR movie so not using all 2160 pixels tall). It played fine in VLC after adjusting AR in prefs. I also tested the 3rd party Plex app on LG and it played fine too in full HD. I did have a problem with audio, doesn't support lossless audio, have to downgrade. I would rather send signal to TV and not process internally, my preference. Plex app does a great job of auto switching 3D content and you can play 4K content flawlessly. I would install Plex on LG and give that a try, much better than USB drive.
For 4K content in 3D, it should be t/b since the passive display will only allow 1080p per eye. If you produce side by side UHD frame the display will only show 1920x1080p. The width will be upconverted to UHD width and not native source and the height will but cut from 2160p per view to 1080p similar to what passive 1080p displays do with HD. But t/b will be displayed in highest resolution on your 4K LG in 3840x1080p per eye native resolution with no upconverting.
For YT, full HD won't work from YT player, no option to adjust image to correct layout for full HD, you will get two smaller HD frames side by side. Only way to play it would be to download it first like I did, but since I can't get higher than 720p, I have to anyway. But most don't download YT files to play, so half resolution uploads are preferred. For UHD t/b it really depends on display. If you have a passive LG 4K it will work, but as Don has mentioned, some devices won't accept UHD signals and 3D mode at same time only up to 1080p.