Burn multiple video files to one single DVD

I am converting a ton of old home videos to digital format, and I want to store them on DVDs. I'm using Elgato Video Capture to connect my VCR to my Mac which works fine for creating mp4s. I can then "right-click" on the mp4 file name in Finder and one of the options is "Burn [filename] to Disc". This is fine. But my problem is that many of these videos are fairly short clips and I don't want to use one single DVD for each one.

Does anyone know any way that I can burn multiple mp4 files onto one single DVD? Whenever I go to burn one of them to Disc, it seems to want a blank disc each time.

I suspect there is software out there that I could purchase, but I was hoping not to spend much money on this project. Any way of doing this in the standard Mac software? Or maybe a not too expensive DVD burner software I could buy which would allow this?

Thanks!