The files you getting out of Canon T7i are suited to be delivered as is, which is usually not what you want. In order to edit Canon T7i MP4 files in DaVinci Resolve 12/11/10/9 smoothly, the H.264 compression format requires that files be transcoded into a format better suited to editing, effects, and color grading; this would usually be DNxHD codec, which ensures maximum editing quality and efficiency when working with DaVinci Resolve. So the easy workaround to convert Canon T7i/800D H.264 MP4 to DNxHD for DaVinci Resolve.
What's need is a just a common video converter like Dimo Video Converter Ultimate for Mac. It supports creating high quality DNxHD .mov video for DaVinci Resolve, no matter what's the format of your source video files. By running it, there's no need to set the codec by yourself: the Mac program has optimized DNxHD presets for DR. And it converts flawlessly.
Meanwhile, the Mac MP4 Video Conversion tool can create files compatible with various non-linear editing systems like FCP, FCE, iMovie, and Adobe Premiere (Pro), etc
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