Question / Help Game Audio/Video Sync Issue (Minor)

[HELIOS.Z3R0]

Usually during longer recordings (30 mins - an hour) I experience a slight shift in the audio/video sync, causing a keyframe interval (set to 1 second) to be skipped (assumed) in the audio. I can usually locate the skipped interval and re-sync however it causes some concern. Is there any way for me to ensure that my audio remains synced?

I understand that OBS is deemed as broadcasting software, and not necessarily recording software, however the functionality is there and to this point OBS-MP has been the most reliable software out of anything I've tried with a great combination of filesize management, low performance impact, and reliable recording.

 

[dssdassw]

In Multiplatform, just above your volume controls on the "main screen" there is a gear. If you click that, there are some delay (positive and negative values are both permitted) options for audio. A sync issue so minor that it only occurs during long recordings means you probably don't need to set a value TOO high, but it also means that testing will be a pain for you to test. It would help if you posted a log, so I could see a little more about this. Try what I suggested, but please post that as well (and of course check back for replies).

 

[HELIOS.Z3R0]

I think you misunderstood the problem. A keyframe interval appears to be skipped, it happens during the recording at a seemingly random interval. Video/audio starts out perfectly synced at first, and then once a point is reached the audio appears to skip an interval and proceed to the next, resulting in loss of audio for that interval.

I don't have a log that's timestamped for the time of the recording, so it will likely be largely useless until I record next. This is a pretty steady pattern so I'll have a log for you tonight.

::EDIT::

Upon reviewing a log with a similar timestamp, I discovered the logs are not created based on recording sessions, as such the log is uploaded and ready for review. The particular incident in question is with SOMA.exe

 

[HELIOS.Z3R0]

Anyone have any ideas on this? It's really confusing me. It's happened on Killing Floor 2, SOMA, and Borderlands 2 so far.

 

[Yurlyn]

Have you tried setting the key interval to a different number? Also, I can't seem to find that option from OBS classic that uses timestamps for the audio syncing in OBSmp. That might've been able to fix this.

 

[HELIOS.Z3R0]

Have you tried setting the key interval to a different number? Also, I can't seem to find that option from OBS classic that uses timestamps for the audio syncing in OBSmp. That might've been able to fix this.

I've been afraid to, since setting the keyframe interval to 2 or 1 has caused the audio to lose 1-2 seconds of audio per skip (hence why I believe that OBS is somehow skipping keyframes). I'll check it out though

 

[Melaciour]

I've been afraid to, since setting the keyframe interval to 2 or 1 has caused the audio to lose 1-2 seconds of audio per skip (hence why I believe that OBS is somehow skipping keyframes). I'll check it out though

Did you ever figure out the issue? I'm running into the same problem currently.. Microphone audio is perfectly in sync, yet the game audio dips out of sync.

 

[HELIOS.Z3R0]

Did you ever figure out the issue? I'm running into the same problem currently.. Microphone audio is perfectly in sync, yet the game audio dips out of sync.

Something that never occurred to me is that my GPU runs rather hot, closing in and sometimes exceeding the 70C mark. Since hardware (that I've observed) throttles heavily at 80, it could be that my GPU was throttled and causing a destabilization in the recording, causing a keyframe interval with audio to be missed. I'm still investigating, I have brand new pretty much bleeding edge hardware running (i7 6th gen + DDR4 RAM + GTX 980). I'm running tests to see how it plays and I'll report back.