Where is "Based on Source" in Video Settings?
I can't get a video to export correctly for Instgram. It's either like a postage stamp in the middle of a black screen or the screen shrinks to fit its small size. I was told previously to click on "based on Source" in the Video Settings but I can't find that option. Instead, I find "Match Source" and got the latter result described above. My impression is that the video should be 1920x1080 since (I believe) 1080x1920 results in a 1080px high video and I want the video to be 1920px high. I tried 1920x1080 Full HD but this gave me the same result as above. If there is a failsafe way to obtain the results I need (for exporting for Instagram) that would be great to know so I don't have to go through this repeatedly. Thanks.

