In terms of container format features, MKV is an open-source container format that can hold any video codec and audio codec, while MP4 is limited to the codec specified by the MPEG standard. However, if you want a smooth playback with minimum buffering, you have to take consideration of both format feature and device compatibility. can be played if they are uploaded to Plex. Also, it is announced that formats like ASF, MKV, MOV and AVI, etc. Plex is officially claimed that its supported video is typically though not necessarily restricted to MP4 format. Part 1: What is the best video format for Plex, MKV, MP4 or something else? Part 2: How to convert video files to MP4 for Plex with VideoProc Converter.
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