Why does Windows 10 File Explorer not show thumbnails for mp4 …
https://superuser.com:443/questions/1702123/why-does-windows-10-file-explorer-not-show-thumbnails-for-mp4-video-files
WEBJan 29, 2022 · 2. This is not a just a format problem. It's could also be a codec problem. For example. A mp4 file can be h264, h265, vp9, av1 . In default, Windows generate thumbnail only for h264 . For other codec, user need to install following extensions in Microsoft Store. HEVC Video Extensions. VP9 Video Extensions.
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