QuickTime MIME Type

What does video/quicktime mean?

The video/quicktime media type identifies a QuickTime movie, commonly stored with the .mov extension. MOV is a container, not a video codec. One movie can combine video, audio, subtitles, timecode, and metadata, with each track using its own encoding.¹²

IANA registered video/quicktime in June 1993 with no required or optional parameters. The registration describes QuickTime movies as binary data and recommends a single-fork movie file for exchange beyond classic Macintosh systems.¹

How to identify a QuickTime movie

QuickTime files are built from units Apple calls atoms. Each atom begins with a size and a four-byte type, then contains data or more atoms. This structure lets readers skip unfamiliar atoms and made the format adaptable to new media types.³

There is no short byte signature shared by every valid MOV file. Some QuickTime movies begin with an ftyp atom, but that atom is optional. When it is present, its major and compatible brands describe which related file-format specifications the file follows. A QuickTime-compatible ftyp atom includes the qt brand.⁴

A reliable inspection therefore checks:

• Atom sizes and hierarchy, not just the .mov extension.
• The brands in ftyp, when that atom exists.
• Every video, audio, subtitle, and metadata track that matters to the workflow.
• Whether the movie is self-contained or refers to media stored elsewhere.

QuickTime can reference media outside the movie file. That is useful in production, but a reference movie may stop working when moved away from its related assets. For sharing or archiving, verify that the copy is self-contained.⁵

How to open a video/quicktime file

QuickTime Player is the natural first choice on macOS. Apple Motion also lists MOV among its supported containers and can combine clips that use different codecs.⁶⁷ Other maintained media players and editors may open MOV files when they support every codec and feature used by the tracks.

Browser support is narrower than the familiar .mov extension suggests. MDN lists Safari for the QuickTime container and recommends MP4 when one web video must reach the broadest range of browsers.²

Apple's current QuickTime Player exports MOV with H.264 or HEVC video. Choosing H.264 favors compatibility, while HEVC can produce a smaller file and can preserve transparency in supported material.⁶

QuickTime movie support in Poly

Poly gives supported .mov videos a practical browsing and search experience:

• A representative thumbnail and timeline previews for navigation.
• In-app playback that can jump to a matching moment.
• Available details such as duration, dimensions, frame rate, codecs, color information, and audio tracks.
• Search across the filename, spoken transcript, and visual content.
• Access to supported visual content, transcript, and metadata through the Poly agent.

Transcript search requires audible speech. A silent movie can still benefit from visual search. Playback and content-aware features depend on the media carried by the container.

See Supported File Types for the compact video feature comparison.

MOV compared with MP4 and M4V

MOV, MP4, and M4V share an atom- or box-based design, but their labels communicate different format expectations.

Apple explains that QuickTime was the basis for the MPEG-4 and JPEG 2000 file formats, but they remain distinct formats despite many similar structures.⁸ The ftyp brands help distinguish a true QuickTime movie from an MPEG-4 file that was merely given a .mov extension or the video/quicktime label.⁴

Renaming clip.mov to clip.mp4 does not perform that conversion. It changes the filename without changing the container brands, tracks, or codecs.

Converting MOV to MP4 or WebM

Choose the conversion method after inspecting the tracks:

Remuxing changes the container without recompressing compatible tracks. Re-encoding can improve compatibility, but it may lose quality and omit specialized data. Before discarding the source, compare duration, synchronization, frame rate, color and HDR behavior, captions, timecode, alpha, and every required audio track.

When was QuickTime created?

Apple introduced QuickTime in 1991. The format went on to influence the ISO Base Media File Format and the later MP4 family.²⁹ The IANA record followed in 1993 and still defines video/quicktime as the registered media type.¹

QuickTime remains active in Apple media production. For example, current QuickTime Player exports .mov, and the Library of Congress lists selected ProRes encodings in a QuickTime container among its preferred formats for file-based video.⁶¹⁰