For a film like Unfreedom , with nuanced dialogue and occasional subtitle needs (for non-English segments), MKV is ideal.

: The source of the file, typically downloaded from a streaming service like Netflix or iTunes, meaning it hasn't been re-compressed from a broadcast. : The audio is in English with a 2-channel stereo setup. : Includes hardcoded or muxed English subtitles. : The video codec used to compress the file. : The Matroska Multimedia Container format.