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MP3 - Audio File Format
https://docs.fileformat.com/audio/mp3/#:~:text=Files%20with%20.mp3%20extension%20are%20digitally%20encoded%20file,1%2F10th%20the%20size%20of%20.WAV%20or%20.AIF%20files.
MP3 - Audio File Format
https://docs.fileformat.com/audio/mp3/
Files with .mp3 extension are digitally encoded file formats for audio files that are formally based on the MPEG-1 Audio Layer III or MPEG-2 Audio Layer III. It was developed by the Moving Picture Experts Group (MPEG) that uses Layer 3 audio compression. Compression achieved by MP3 file format is 1/10th the size of .WAV or .AIF files.
MP3 File Format Specification - mpgedit
http://mpgedit.org/mpgedit/mpeg%5Fformat/MP3Format.html
Generally, frames are independent items. Each frame has its own header and audio informations. As there is no file header, you can cut any part of MPEG file and play it correctly (this should be done on frame boundaries but most applications will handle incorrect headers). However, for Layer III, this is not 100% correct.
mp3Frame - ID3.org
FrameSize = 144 * BitRate / SampleRate when the padding bit is cleared and FrameSize = (144 * BitRate / SampleRate) + 1 when the padding bit is set. The !frameSize is of course an integer. If for an example BitRate=128000, SampleRate=44100 and the padding bit is cleared, then the FrameSize = 144 * 128000 / 44100 = 417.
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