Edit: I encode to/with(?) the codec h246. This question is about containers/filename extensions.
I am digitizing old video mediums, such as VHS, VHS-C and Mini DV. A few colleagues have asked me to do it for them, which is awesome and feels great. Now, for personal use, I encode save video with the .mkv container out of habit. I have no idea why that is bad or good. However, the question is, which container should I use to ensure maximum compatibility with my colleagues’ phones, computers, possibly TVs? Is, for instance, .mpeg the way to go?
Careful, you seem to confuse video encodings (e.g. mpeg, h264, h265, av1) with video containers (e.g. mkv, avi, webm). When digitizing old media, the encoding is much more important because changing it afterwards means losing quality whereas changing the container format doesn’t.