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| File extension | .AC3 |
| Category | Audio File |
| Description | AC3 is a file format with multi-channel Dolby Digital sound. Each file with .ac3 extension may contain up to 6 audio data blocks, and each block consists of 256 audio fragments for each channel. AC3 tracks may feature output for subfoofer in order to create dimensional 5.1 sounding. AC3 tracks are supported by multiple freeware players, but the quality of sounding highly depends on the acoustic system. If the software doesn't support AC3, AC3 Filter codec needs to be installed. |
| Associated programs | QuickTime Player VLC Media Player Windows Media Player |
| Developed by | Dolby Digital |
| MIME type | |
| Useful links |
| File extension | .MP4 |
| Category | Audio File |
| Description | MP4 files can contain video and sound data. It is a file container that supports different multimedia content types such as multiple audio streams, subtitles, 2D and 3D image frames. MP4 is also used for streaming media services (online or digital TV). This file type supports the control of transmission speeds for media signal, as well as correcting corrupted frames. Thanks to comparatively low system requirements, MP4 is now the most popular container type for sharing media. |
| Associated programs | Apple QuickTime Player Apple iTunes Microsoft Windows Media Player VideoLAN VLC Media Player |
| Developed by | Moving Picture Experts Group |
| MIME type | |
| Useful links | More detailed information on MP4 files |
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