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qtdemux: Demux RGB Uncompressed MP4

Devon Sookhoo requested to merge devonsookhoo14/gstreamer:demux_unc_mp4 into main

MPEG's new ISO/IEC 23001-17:2024 defines the uncompressed codec for MP4 files. It introduces 3 new boxes:

  1. uncv - VisualSampleEntry
  2. cmpd - Component Definition Box
  3. uncC - Uncompressed Frame Config Box

These boxes have many options which means that a complete implementation would be quite involved. With this MR, I'm mostly interested in the basic 8-bit RGB scenario.

These boxes are recognized by MP4Box.js. GPAC is capable of playing and generating sample files with its uncvg. See GPAC sample file here.

Edited by Devon Sookhoo

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