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| Name | ASF | MOV |
| Full name | ASF - Advanced Systems Format | MOV - QuickTime File Format |
| File extension | .asf | .mov, .qt |
| MIME type | video/x-ms-asf, application/vnd.ms-asf | video/quicktime |
| Developed by | Microsoft | Apple Inc. |
| Type of format | Digital container format | Media container |
| Description | Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Media Foundation framework. | QuickTime File Format (QTFF) is a computer file format used natively by the QuickTime framework. The International Organization for Standardization approved the QuickTime file format as the basis of the MPEG-4 file format. Because both the QuickTime and MP4 container formats can use the same MPEG-4 formats, they are mostly interchangeable in a QuickTime-only environment. |
| Technical details | The format does not specify how the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats. One of the objectives of ASF was to support playback from digital media servers, HTTP servers, and local storage devices such as hard disk drives. | The format specifies a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, or text (e.g. for subtitles). Each track either contains a digitally-encoded media stream (using a specific format) or a data reference to the media stream located in another file. |
| Associated programs | Windows Media Player | QuickTime |
| Wiki | https://en.wikipedia.org/wiki/Advanced_Systems_Format | https://en.wikipedia.org/wiki/QuickTime_File_Format |