This problem has occured to me multiple time when I render videos. When I render 1080p videos with little effects (color correction,velocity), my computer would render them fine. On the other hand, when I render a video regardless of quality but with a crap ton of effects, Sony Vegas would crash midway or freeze out. I searched through several videos to this, but none of them helped whatsoever.
PC Specs
4 GB of Ram
GPU: NVIDIA GT 720
CPU: AMD Phenom II X4 840(4 CPUs)
Some proof
https://gyazo.com/77a77ac9be2d876f4917051821ed95f1
https://gyazo.com/411eaae4e0f1b46fbf6ad7e88deb90ab
PC Specs
4 GB of Ram
GPU: NVIDIA GT 720
CPU: AMD Phenom II X4 840(4 CPUs)
Some proof
https://gyazo.com/77a77ac9be2d876f4917051821ed95f1
https://gyazo.com/411eaae4e0f1b46fbf6ad7e88deb90ab