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The MP4 file format defined some extensions over the ISO Base Media File Format to support MPEG-4 visual/audio codecs and various MPEG-4 Systems features such as object descriptors and scene descriptions. Some of these extensions are also used by other formats based on the ISO base media file format (e.g., 3GP). [1]
Lossy formats Audio compression format Algorithm Sample rate Bit rate Latency CBR VBR Stereo Multichannel; AAC: MDCT, Hybrid Subband (AAC-HE) 8–192 kHz, [53] also: 7.35 kHz, but used rarely. 8–529 kbit/s (stereo, 44.1 kHz) 8–576 kbit/s (stereo, 48 kHz) 20–405 ms [54] Yes Yes Yes: Dual, Mid/Side, Intensity, Parametric Yes: Up to 48 ...
This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbersor Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible. However, some file signatures can be ...
Video file format. A video file format is a type of file format for storing digital video data on a computer system. Video is almost always stored using lossy compression to reduce the file size. A video file normally consists of a container (e.g. in the Matroska format) containing visual (video without audio) data in a video coding format (e.g ...
Timeline of audio formats. An audio format is a medium for sound recording and reproduction. The term is applied to both the physical recording media and the recording formats of the audio content —in computer science it is often limited to the audio file format, but its wider use usually refers to the physical method used to store the data.
Yes. The Apple Lossless Audio Codec ( ALAC ), also known as Apple Lossless, or Apple Lossless Encoder ( ALE ), is an audio coding format, and its reference audio codec implementation, developed by Apple Inc. for lossless data compression of digital music. After initially keeping it proprietary from its inception in 2004, in late 2011 Apple made ...
An audio file format is a file format for storing digital audio data on a computer system. The bit layout of the audio data (excluding metadata) is called the audio coding format and can be uncompressed, or compressed to reduce the file size, often using lossy compression. The data can be a raw bitstream in an audio coding format, but it is ...
ARC – Nintendo U8 Archive (mostly Yaz0 compressed) ARJ – ARJ compressed file. ASS, SSA – ASS (also SSA): a subtitles file created by Aegisub, a video typesetting application (also a Halo game engine file) B – (B file) Similar to .a, but less compressed. BA – BA: Scifer Archive (.ba), Scifer External Archive Type.