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Message: [QUOTE="Oliver Wong, post: 1603189"] See [URL]http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm[/URL] While a "frame size" is constant, the frame size is the number of samples within a frame, not its size in bytes. The encoding of the samples varies from frame to frame to ensure a constant bit rate. 128kbps 44.1Khz layer II uses mostly 418 byte frames, but occasionally will use a 417 byte frame. You can cut a mp3 file at any frame boundary, but I'm not sure you can, for an arbitrary mp3 file, determine what byte offset to jump to to arrive at exactly the "1 minute" point. You may have to decode, at the very least, calculate how many samples are in 1 minute, and then jump through the file looking for frame-synchronization markers. - Oliver [/QUOTE]