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Jeff Widmer's Blog - MIME Type for .MP4 files is video/mp4
Support HLS w/ MP4 subtitles without MIME type info · Issue #1959 · shaka-project/shaka-player · GitHub
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Jeff Widmer's Blog - MIME Type for .MP4 files is video/mp4
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Save video error on Android: MIME type video/mp4 cannot be inserted into content://media/external/images/media; expected MIME type under image/* · Issue #423 · react-native-cameraroll/react-native-cameraroll · GitHub
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Mime type, mp4 icon - Download on Iconfinder on Iconfinder