vivid oracle
Platform: Arch Linux
Headset: Occurs on both Quest 2 and 3
Installation Method: From Source, occurs on latest as well as last stable release.
GPU: AMD Radeon RX 7800 XT
After a random amount of time, the feed flashes green and starts smearing, it temporarily goes away after moving around for a bit.
Nothing is logged when this corruption occurs
HEVC has a different problem, at higher bitrates (100 mbps +) the feed will start flickering between extremely low bitrates and extremely high bitrates.
i see
still happens even when set to constant?
ill try those exact settings
still does it
i dont even think that is physically possible
its inconsistent but it happens when the thing i am looking at has some level of noise on the texture, like carpets, turf
everything in pavlov
fair
i have a recording if that would help better
tried two,
Xfinity XB8, streamer hard wired, client on 6 ghz
TP-LInk AX1800, streamer hard wired, client on 5 ghz
overall its fine
h.264 works great at 400 mbps
except those rare times where everything turns either green or grey
quest hard crashed 
vce usage stays at 44% with HEVC 10 bit at 220 mbps
63% with h.264 at 350 mbps
vivid oracle
h.264 smearing - fixed in latest commit
hevc "heartbeat" - setting priority to 2 in mediacodec extra options fixes it
this thread is now resolved
vivid oracle
a very painful amount of trial and error
it does still sometimes struggle on very noisy textures but only really above 200 mbps
in normal use i havent experienced any issues and have even been able to play 120 hz quest 3 native res 200 mbps 10-bit hevc with no issue
though ive seen a few people talking about other headsets not being able to handle priorities above 0
i.e. #linux-discussion message
vivid oracle
This is the only info I can find on it, I guess emphasis on performance not guaranteed depending on the decoder
Nowrep probably knows
0-2 only work, above 2 crashes alvr, 2 might either be an even lower priority or an alias to 1
Or the XR2 is weird
True
Probably placebo
But 1 was a definite change over 0
chilly notch
not the the same person as the developer of VD :)
also the two options are already included
also the "heartbeat" isn't a thing of the encoder?
i guess it needs more testing. you can test too :)
vivid oracle
what I would describe as the heartbeat is the decoder becoming saturated and the bitrate pulsing like a heart beat
vivid oracle
confirmed 2v1 is a placebo, priority set to 1 is the only value that needs to be tested
rotund kiln
so operating rate is placebo is that what you mean?
vivid oracle
no the priority being in a range from 0-2
though operating rate hasnt made any difference either in my testing
rotund kiln
so priority is just placebo
vivid oracle
priority 2 is
rotund kiln
so 1 does make a change?
vivid oracle
priority 1 over the default of 0 prevents the heartbeat bitrate effect
rotund kiln
hmm ok
vivid oracle
0 causes that effect to appear at just above 100 mbps
1 allows 200 mbps but i havent tested above that
decoding latency of 12 on priority 1 vs 16-30 in worst case when set to 0
rotund kiln
so what does the change look like?
vivid oracle
ill take a video of 200 mbps at priority 1 vs 200 mbps at priority 0
rotund kiln
thanks
vivid oracle
its just the abscence of pulsing
rotund kiln
also maybe open obs and record the alvr dashboard window
vivid oracle
i still am able to make it freak out at priority 1 but its much harder
spinning in a circle at a noise texture
rotund kiln
try that but with 2
vivid oracle
2 and 1 deliver same effect
rotund kiln
ah so you've already tried that test
vivid oracle
vs priority 0 by just merely looking at the texture
rotund kiln
I find this kinda funny considering that we're the only thing that should be using the decoder
ok just submit a pr whenever ready
rotund kiln
wdym
vivid oracle
video didnt embed
rotund kiln
hevc doesn't embed with discord
vivid oracle
i remember it working before
vivid oracle
youtube is going to completely fuck up the compression but you should still be able to see the difference
and the video file itself
rotund kiln
yea just do the video files
vivid oracle
yea youtube completely destroys the bitrate
rotund kiln
having youtube compression isn't going to make it useful
rotund kiln
anyway like I said make a pr I think you've supplied enough info
vivid oracle
vivid oracle
anyway like I said make a pr I think you've supplied enough info
aight will do
heres priority 1 since its small enough to fit on discord
rotund kiln
anyway like I said make a pr I think you've supplied enough info
it'll be interesting to see how adaptive bitrate happens to be affected
vivid oracle
it'll be interesting to see how adaptive bitrate happens to be affected
it aggressively tries to push above 400 mbps
300 mbps is the limit on prio 1 before the decoder starts getting saturated again
on h264 it pushes into 500 mbps and looks perfectly fine
rotund kiln
hmm I see
vivid oracle
with remarkably low latency, 12ms
rotund kiln
so tuning is needed to get the algorithm not to kill h265
vivid oracle
and potentially av1 i havent tried it yet
ive been having issues getting alvr to respect my bitrate for av1 as it was always capped at 100
heavily reduces latency on av1 but doesnt fix the capped bitrate
although that definitely seems to be an AMD VCE issue as adaptive says it can only hit 100mbps
rotund kiln
honestly I can't believe we missed that
rotund kiln
I'm going to be testing the quest two
huh this makes no sense how is giving it not realtime priority perferred?
and the reason why 2 did nothing is because it simply isn't used
vivid oracle
huh this makes no sense how is giving it not realtime priority perferred?
if i had to guess maybe giving it realtime priority starves it
rotund kiln
when realtime isn't realtime 
vivid oracle
im curious what happens if i dont even include priority
if it just does best-effort by default
yea it just defaults to best-effort im going to update my pr
vivid oracle
leave the choice in <@346135736720031745>
actually yeah true
someone did have issues with it set to best-effort
i think on the pico 4
though the pico 4 still uses the xr2 and theoretically similar android
rotund kiln
yea on q2 I'm not convinced
vivid oracle
What happens on q2?
soft birch
in normal use i havent experienced any issues and have even been able to play 12...
10-bit isn't supported on AMD
Or Linux
soft birch
Ohhhhhh
Misread it!!
It said "Not supported on Linux WITH NVIDIA"
I somehow misremembered it as "Only works on Windows with NVIDIA" or something like that
My baddddd
chilly notch
oh btw, there is also the option "low-latency" = 1 that might be useful. this is supported now on quest 2 and above that are on android 12
