So how do we get Unreal folks to pay attention to this? Where is the support site for entering bugs? I went to what I believed that to be and one has to buy a custom license to get any one on one support. Is the GITHUB site for UE code that accepts bug reports?
@GaryHausECS - want to keep you up to date on an experiment I just tried. I created a new, blank test project and added a level sequence, imported the same .wav file, added it as an audio track and it scrubbed as expected.
What I did next was backup the DefaultEngine.ini and REPLACE it from the project that cannot scrub, reopened the new test project and now it is not scrubbing the audio track properly.
So I’m going to one by one comment out each engine settings (starting with what I think the most likely culprit is first), reload the project and see what setting is causing the issue.
I started writing a bug report but thought with all the info they want, I should find out what breaks a new blank project wrt to audio scrubbing. I’ll keep you posted. My theory is UE version aside, we have the same setting that is causing this.
Well I took the better part of a day to try and nail this down. I dont think this is a real result.
If I remove this engine setting:
r.PostProcessing.PropagateAlpha=1
and restart UE The scrubbing comes back. Also if I set it to 0 (which must be the equivalent of removing it) that fixes the scrubbing as well.
However, it’s what setting that to 1 does is what’s important. Setting to 1 causes a recompilation of all the shaders in the project. I believe there are other settings like ray tracing, etc. that will also cause shaders to recompile. So really what is going on with shaders that is causing audio drops when scrubbing? SO now I’m beyond my level of expertise here. I have a very, very high end workstation so I cannot believe this would be a performance issue.
I guess it’s time for a bug report. At least it’s a standard out-of-the-box project with ONE audio file added, and I can zip it up as an example. Ugh.
Thanks for taking the time to try and debug as well. My machines are also pretty high end. Not a performance issue. 128Gb ram. 3090RTX. Highend Intel i9.
Submitted a case for this. At least the project showing it NOT scrubbing properly is zipped and if you delete some project settings and reload it, it start working.
What DOES help this issue is strangely enough the NVIDIA DLSS plugin set to “balanced”. This leads me to believe this is either a performance issue or a priority issue with the audio layers not getting enough of a shot at playing as you scrub.
Also, I have been building the 5.1 branch locally in the hopes that UNREAL will fix this some other way without resorting to DLSS, but no luck.
Unreal has not responded to my case either way. So whatever this is, they are not fixing it in 5.1 or my tests would show that.