I have 2 videos that I have brought into my scene as image planes. They play fine but I would like to have them begin on the timeline at different times, maybe one video at frame 1 and the other at frame 50 and playing together when the second one is introduced. Currently they both play at frame 1. Thank you.
This can easily be done. Just select your video clip and go to the Material Properties tab. You can also use the Node Editor.
There, you will see many options, including the Start Frame value. set it to whatever you want.
You can simply just animate te vissibility of the video by selecting it's associated object, going to the Object Data Properties tab, and press I on your keyboard while hovering over the checkbox to animate the value.