In this blog article, we will provide information about what MOV is, its relationship with QuickTime, and how it became the basis for MP4. Let’s get started.
Kas yra MOV?
The QuickTime File Format (QTFF) is a file format used natively by the QuickTime framework. It has three file extensions.
It is a type of container format that can hold audio, video and text.
The .MOV file format is a multimedia container file format used by QuickTime, Apple’s framework for handling video, audio and other multimedia content. It stores garso, vaizdo and text (such as subtitles) in a single file, and can support multiple tracks, making it versatile for various media types.
MOV files can use different codecs to compress and store media, allowing for high-quality playback. It is commonly used for video editing and professional media production, and is compatible with both macOS and Windows platforms when QuickTime or compatible software is installed.
QuickTime failo formato (.MOV) apžvalga
QuickTime is a multimedia container format. This means it can store different types of media (like garso, vaizdo, and text) in a single file. Here’s how it works:
Takeliai:
QuickTime file can contain multiple tracks, with each track dedicated to a specific type of data. For example, one track may store video, another may store audio, and another may store subtitles.Each track either contains digitally encoded media data (such as a video or audio stream) or a reference to media stored in a separate file.
Atoms and Hierarchical Structure:
Tracks in a QuickTime file are organized using a system of atoms, which are the basic building blocks of the file structure.A parent atom can either contain other atoms or store data, such as media or editing instructions. However, an atom can’t perform both functions at the same time—if it’s a parent atom, it won’t store media data, and if it stores data, it won’t act as a parent atom.
One of QuickTime’s strengths is editing flexibility. The format allows the media data to be referenced but not necessarily embedded directly in the file. This has key benefits:
Data Reference:
QuickTime can store abstract data references, meaning it doesn’t need to copy the actual media data each time you edit. The file just points to the media, which allows for more efficient editing.In-Place Editing:
Because of the way data is stored and referenced, QuickTime can edit in place. This means you can change or edit the media without needing to duplicate or rewrite the data, which saves space and improves efficiency.
QuickTime (.MOV) ir MP4 konteineriai
Keičiamumas:
QuickTime ir MP4 konteineriai yra gana panašūs, nes abu palaiko tuos pačius MPEG-4 formatus, įskaitant vaizdo ir garso kodekus. QuickTime išskirtinėje aplinkoje, t.y., sistemoje ar programoje, kuri naudoja tik QuickTime, dažnai galima keisti [QuickTime] (.mov) failus ir MP4 failus be didelių problemų, nes abu remiasi tais pačiais MPEG-4 kodekais.
MP4 platesnis palaikymas:
Tačiau MP4 yra plačiau priimtas kaip tarptautinis standartas, todėl jis turi platesnį suderinamumą, ypač su aparatinės įrangos įrenginiais. Pavyzdžiui, tokie įrenginiai kaip PlayStation Portable (PSP) ir daugelis DVD grotuvų natūraliai palaiko MP4 failus.
Programinės įrangos pusėje MP4 palaikomas daugumos DirectShow ir Video for Windows kodekų paketų, tuo tarpu QuickTime File Format (QTFF) nėra taip plačiai palaikomas. Dėl to MP4 dažnai yra lankstesnis pasirinkimas, ypač kai kalbama apie atkūrimą įvairiose platformose.
QuickTime kaip MPEG-4 pagrindas
The QuickTime file format was officially recognized by the International Organization for Standardization (ISO) as the foundation for the MPEG-4 file format. This means that many components of the QuickTime format were integrated into the creation of the MPEG-4 standard.
In 2001, ISO published the QuickTime file format specification, which became the basis for the MPEG-4 file format specification.
MP4 kūrimas:
The MP4 (.mp4) failo formatas was introduced in 2001 as an updated version of the MPEG-4 Part 1: Systems specification from 1999 (ISO/IEC 14496-1:2001).
MP4 was developed to provide a standardized way to store multimedia content, such as video and audio, ensuring compatibility across various platforms and devices.
MP4 pataisos:
In 2003, the MP4 file format was revised and replaced by MPEG-4 Part 14: MP4 File Format (ISO/IEC 14496-14:2003).
This revision refined the original MP4 format, providing clearer guidelines on how multimedia content should be stored in the file format. The MPEG-4 Part 14 specification also improved the handling of audio and video streams within the MP4 container.
ISO bazinis medijos failo formatas
The MP4 file format was generalized into the ISO Base Media File Format, which defines a basic structure for time-based media files like video and audio. This format also became the foundation for other multimedia formats.
Some formats based on the ISO Base Media File Format include:
- 3GP (naudojamas mobiliesiems telefonams)
- Motion JPEG 2000 (naudojamas aukštos kokybės vaizdo sistemose)
Išvada
In this article, we learned that MOV is a file format related to the QuickTime framework developed by Apple, how it works and how it became the basis for other notable formats like MP4, as well as other ISO formats like 3GP. Hopefully, this has increased your knowledge of the MOV file format. Let us know what you think, and feel free to ask any questions in our forum.