Tencent Music Tech Team
Apr 21, 2017 · Fundamentals
Understanding M4A File Structure and Using the Sample Table Box for Random Access
The article outlines the MP4‑based M4A container’s hierarchical box format, details the Sample Table (stbl) and its essential sub‑boxes (stts, stsc, stco/co64, stsz) that map playback time to file offsets, explains time‑scale conversion, optional boxes, and provides pseudo‑code and parsing tips for precise random‑access seeking.
M4AMP4Media File Format
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