This specification references Low Overhead Container (LOC) [LOC] to define how audio and video content is packaged. With this packaging mode, each EncodedAudioChunk or EncodedVideoChunk sample is placed in a separate MOQT Object. Samples that belong to the same Group of Pictures (GOP) MUST be placed within the same MOQT Group.
When LOC packaging is used for a track, the catalog packaging attribute (Section 5.2.4) MUST be present and it MUST be populated with a value of "loc".