How do I find the codec of a video? It's pretty simple but there are a variety of ways to do this. Outside of an editing program, there's not an easy way to do this without another program. For both Mac and PC, there is a program called Mediainfo that is freeware that can be downloaded and installed. Once installed, you can open up any video file and find the codec information immediately.
If you are in Adobe Premiere Pro, you can select the file that is in your media window, right-click and go to properties to show the information. Within Davinci Resolve, whena clip is selected, the Metadata tab on the right side can be turned on to view each file's metadata. Most other editing softwares will have the ability to give you the information for any clip that is imported in a project.