Lag issue with my Videos

[Ohannis]

Hi, 

So when I usually edit my videos for my channel I encounter a big problem which I cannot fix. 

That is when I would play a clip it would originally start smooth then it would lag at a certain point and then would go smooth again. I tried multiple ways (including updating drivers) nothing worked. Even when I would export the video that same problem would re-appear where that specific point would again lag. I attached a video as a example of how it runs smoothly and then lags. I also attached a video of the exported video lagging. I would really appreciate if someone would be able to help! 

[Warren Heaton · Accepted solution]

Hi, @Ohannis.

It looks like you are edting screen recordings of gaming.  Most likely, your source footage is both Long-GOP and Variable Frame Rate (VFR) and that can cause performance issues, especially in longer Timelines.

I'd try to transcode a few of your source clips using Shutter Encoder (donationware).  The pop-up list is organized by how video formats get used.  Whle you can pick almost anyting in the "Editing codecs" section, I'd go with Apple ProRes 422 LT.  If you're really tight on disk space, then go with Apple ProRes 422 Proxy.  Editing formats do not have a GOP structure (each frame is it's own image) and use Constant Frame Rate.  This makes for a larger file, but smoother editing.