StreamS Encoders refer to it as ES (Elementary Stream). (Care to store apple jam in a large bowl?) AAC/HE-AAC can also be in a format called ADTS (Audio Data Transport Stream) (.aac). It doesn’t make much sense, but there are known cases where MP3 codec is placed inside. wav is not exclusively for uncompressed PCM. PCM uncompressed audio data is usually placed inside Waveform Audio Format (.wav) and Audio Interchange File Format (.aiff), and etc. ALAC can also be placed inside Apple Core Audio Format (.caf).
#Freac store metadata in flac mp4#
ALAC is usually bagged (pun intended) inside MP4 containers as well. Likewise AAC/HE-ACC/xHE-AAC codecs are often placed inside MP4 containers (.mp4 or. Apple jam in a zip-top bag seems odd but feasible. Putting apple jam in a jar makes sense, but might not want to put in a bowl. We can put apples in a bowl or a bag but not in a jar. Think of file formats as different containers such as bowl, zip-top bag and jar. The whole apple is lossless, wedges of apple are lossy (no core, seeds, and sometimes skin) but still taste like fresh apple, and apple jam also lossy. Think of audio codecs as a various form of apples. It’s a digital representation of an audio signal. Uncompressed digital audio data is represented using PCM (Pulse-code Modulation). MP3 is dead.ĪLAC is a lossless codec, while AAC and HE-AAC are lossy. Current state-of-the-art audio codecs include the AAC family which includes AAC, HE-AAC, and xHE-AAC. How effectively an audio codec performs this determines its accepted audio quality. Most codecs selectively throw away acoustic information that is the least noticeable by listeners. Different codecs employ different techniques. The higher the compression, the more thrown away. A lossy codec is a method that designed to throw away information in favor of a smaller file size and can’t be recovered completely. Lossless (e.g.zip) is a method used to compress (make smaller) without losing information and to decompress back to its original form. The term codec is a portmanteau or a blend of two words, coder-decoder, which is an algorithm for encoding and decoding data. There is structurally no difference between MP4 and M4A, other than to signify that M4A is an audio-only version of MP4. ALAC, like AAC, is an audio codec, while MP4/M4A are file formats or containers, which are a set of established rules for how data is arranged, transported and/or stored.
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