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Creator Utilities - names starting with: mp. All names in this category. All categories.
Lossy, uncompressed and lossless explained without the audiophile arguments - and which one a creator should actually keep.
MOV is Apple’s container, MP4 is the universal one - and they often hold identical video. What actually differs, and when converting is worth it.
MP4 wins on compatibility, WebM wins on file size. A practical comparison for creators, with the cases where each one is the right answer.
An .mp4 filename does not identify its codecs. Test playback in another player and inspect the actual streams in an editor. A browser playback failure alone does not prove corruption or upload incompatibility.