How to fix audio and video sync in Descript by adjusting millisecond offsets. The presenter demonstrates with a 750 ms delay, explains that 1000 ms equals one second, and shows how to test different offsets until you find the right one, like −50 ms for their setup.
750 milliseconds (750 ms).
1,000 milliseconds per second.
−50 milliseconds (negative 50 ms).
This is what an out of sync video looks like. My audio is out of sync with my video. It's unpleasant to watch and it's distracting. I'm going to show you how to fix that in descript. To fix the sync, what we're going to have to do is fix the sync on the source video itself. So to do that, come to project and this is going to be the same whether you recorded directly into descript or if you're bringing this video from somewhere else. So we're going to identify that source file. And this one in this case is descript Mastery Dash one. So I'm going to click on that. So I'm first going to play it to determine if my voice is ahead of my video or if my video is ahead of my audio. So I'm going to go ahead and hit play. This is what an out of so you could hear my voice, my audio, before my mouth actually moves in the video. Now I did this intentionally right here on this bottom right, this 750ms. That means 750 milliseconds. That's how much the offset is. So I intentionally made this out of sync to illustrate this point. There's a thousand milliseconds in one second. So this is about three quarters of a second out of sync. And by making it a positive 750 seconds, that has delayed the video relative to the audio. Or said differently, my audio is now 750 milliseconds ahead of my video. So if I lower that number, my audio is going to get closer to my video. So if I Type in a 0, I hit enter. So let's play it with a 0 millisecond offset. This is what an out of sync video looks like. My so that's the default when you're first looking at a video, it's going to be at a 0 millisecond offset. But if you're still having a problem, then you can dial this in as needed. So if I play it and this time my mouth is moving in the video a little bit before I actually hear my voice, then what I'll want to do is put in a negative value. So I'll type in a negative A minus sign and then type in something like 500 milliseconds, you can go big at first and then bracket it down. So if 500 is too much, if you corrected too much in that direction, then you can go down to 250. Then you can go down to 150. So let's play that this. So that time you see my mouth move before you hear the audio. So I've corrected far too much. I'm going to try a smaller amount. This is what an. It's still a bit off. And with every correction you make, play it to see how that change went and keep adjusting until you get the right sync. Out of sync video looks like my mouth. That looks about right. I'm going to try a zero again just to test it. This is what an out of sync video looks like. And my video is still slightly ahead, so I'm going to stick with negative 50 milliseconds. This is what an out of sync video looks like. My audio. And I think that's about right for this setup. That's the gist of it. Just play around with the millisecond offset. And the reason this sync issue is happening in the first place could have to do with your peripherals. I have a different microphone and a different camera. They're both plugged in by different cables. If there's any latency or delay that these cables are causing or that the devices themselves are causing, that could create some of that offset. And so depending on your setup, you may have a particular offset that's always happening. And once you figure out what that is. So in my case, negative 50 milliseconds, I can just type that number in to my videos I recorded with this particular setup. But none of this helps you if you don't know what you're doing with the recorder in the first place. Click on this video next to watch my tutorial on how to record using description.
