120FPS video plays at 60fps max! in SLA PC app

getget

TL'DR: The SLR player is incapable to play any 120fps video , so basically it's a useless option for users at the moment.

Detail: I am using valve index with SLR player, when i play or steam any 60 or 90fps video it goes well (both FPSVR and player setting menu bottom right showed 60 or 90fps)

but when i steam any 120fps video it's locked at 60FPS (both fpsVR and player setting confirmed it). I did some testing, and I found it's DeoVR player problem. because even if i downloaded a sample 120fps file, and play it in standard slone DeoVR player or SLR app, it is both locked at 60fps.

Same file play perfectly in the whirligig player at 120fps, i could not try streaming in whirligig as SLR don't allow it so cannot confirm that. This means no way to play 120fps video in SLR at the moment, have Dev and SLR tried this? if so why bother with the options then? Can you please investigate it (and forward the bug to DeoVR player dev) to see how to fix it.

Note: there is no hardware of network bottle neck, (2800 GPU i7 9700 cpu ). all apps updated in steam (and SLR using the latest update out today). SteamVR updated to the latest version as well(not beta version). Index is set to 120hz (and when playing 90fps, it's set to 90hz to match).

Note 2: i found DeoVR player is quite terrible and wasting lots GPU resource when playing videos ( fpsVR showed 80% usage of RTX 2080), while whirligig only use 40% with same video. Also i have correct streaming quality selected (e.g. 2700p at 120fps) so no confusion there. Software environment: window 10 64bit

Since DeoVR player is not the best VR player out there (it's using over 50% of RTX 2080 usage even when idle with black screen) Is it possible to not limit SLR to DeoVR player , and allow us to use other players to stream?

getget

I found post of deoVR player steam site already complaining about same issue,
https://steamcommunity.com/app/837380/discussions/0/1752394042378823664/

can you send any of your video to the deoVR developer to test?

raser1

Hi @getget, I have no issues playing 120fps videos on a 1080Ti and 6700k. I did have to disable DirectShow and install this codec: https://www.microsoft.com/en-us/p/hevc-video-extensions-from-device-manufacturer/9n4wgh0z6vhq

Also make sure you're not running crazy supersampling numbers. I have the Valve Index and it works fine at 100%.

getget

Thanks raser1 ， i checked that i do have the codec installed, direct show option only availble for local file. But i saw now the SLA has an unity player option which actually do play 120hz, just not deoVR player so it's kind of resolving the problem

raser1

Ah I didn't check the unity player. Good to know that it's working now 🙂

nigelakins

Sorry I'm trying to make sense of this...

Does DeoVR successfully play 90fps and 120fps videos (from either the local storage or streaming) on the Quest 2? Is there any noticeable difference?

ibins

Does DeoVR successfully play 90fps and 120fps videos (from either the local storage or streaming) on the Quest 2?

Yes

Is there any noticeable difference?

Depends on the video and how it was shot.
Higher FPS on a video can have 2 impacts. Higher sharpness of moving things and less stuttering, or a mixture of the 2.

Unlike renderings, where individual frames basically are a frozen point in time, frames in videos have a finite shutterspeed.
A slower shutterspeed means less stuttering but also blurrier movements, faster shutterspeeds the opposite, a sharper image but more stuttering.

As a rule of thumb you choose a shutterspeed around half the frametime for a compromise of smoothness and sharpness.

But this also means you basically can not shoot the same video optimized for different framerates at the same time, and as 60FPS is the most compatible format I guess most will shoot with that framerate in mind.

On top of that not many videos are actually shot in higher then 60FPS, most of the higher framerates are actually just interpolated.

So overall i would say the difference is minimal, at least with current content.

Rakly3

As a side note, I would still recommend using 90Hz display refresh rate setting even when playing a 60fps video. (talking specifically about VR headsets here). The difference is very noticeable on headsets with LCD displays such as the Quest 2.