Time traveling audio...

[iamnotdylan]

I have used this software for years and have never come across something like this. 10 different people recorded the same game this day and every recording came out fine except for this one. We took the necessary precautions by each doing test recordings (which all came out fine) and recording in MKV, but something totally bizarre that I have never seen before rendered probably the most important recording unusable. If anyone can help me determine if this recording is salvageable, or at the very least preventable in the future, it would be much appreciated.

At completely random intervals, and only starting 7 minutes into the recording, the audio just begins speeding up into the future and then going back to normal speed, setting the audio off sync with the video (the video is completely fine and has no issues at all)

Here's a YouTube video showing where this problem begins in the video. You can hear the audio speed up for a second before returning back to normal speed, but now the audio is one second in the future, which you can notice a moment later when the chest opening can be heard before it's even placed.

This random speed up continues to happen and makes the sync with the video so bad that near the end of the recording you can hear audio 20 minutes into the future. The worst part is that the recording ends when the AUDIO ends, not the video, which being 20 minutes ahead, stops the recording 20 minutes before the video (perfectly fine) was even able to get to the point in real time where we actually pressed "stop recording."

It was my understanding the MKV files were written as they were recorded (but maybe i'm wrong), so the fact that it somehow wrote in audio that didn't even exist yet is just a little bit strange to me. This problem does not go away when the MKV is remuxed to MP4, and when played in editing software, so it doesn't appear to be a playback issue. It persists in all 3 audio tracks that were recorded. The person recording told me they had no errors appear while recording and when the recording ended, and nothing happened in terms of connection or power. I have attached their log from that day.

 

[qhobbes]

1. They are running an old version of OBS Studio (31.0.0). Please update to version 32.0.2 or newer by going to Help -> Check for updates in OBS or by downloading the latest installer from the downloads page and running it.
2. The laptop has two GPUs. OBS is running on the weak integrated Intel GPU. For better performance as well as game capture being available you should run OBS on the dedicated GPU. Check the Laptop Troubleshooting Guide.
3. The GPU is maxed out and OBS can't render scenes fast enough 42% of the time. That's a lot. If #2 doesn't help then be aware that running a game without vertical sync or a frame rate limiter will frequently cause performance issues with OBS because your GPU will be maxed out. OBS requires a little GPU to render your scene. They should enable V/G-sync or set a reasonable frame rate limit (whatever 59 Hz your monitor is and half that) that your GPU can handle without hitting 100% usage. Be aware that Multipass, Look-ahead and Adaptative Quant use additional GPU.
4. Display and Game Capture Sources interfere with each other. NEVER put them in the same scene (Scene 1). Some also advise against putting Game and Window capture sources in the same scene (recording).