MPEG-4 video profile

Overview

Containing profile atom: Track (video), movie
part-ID: 0x20202020 (universal feature)
feature-code: ’m4vp'
feature-value: Unsigned int(32) where least significant 8 bits hold the profile_and_level_indication from the visual_object_sequence, as defined in specification ISO/IEC 14496-2, retrieved from the video parameters for the MPEG-4 video codec description. The top 24 bits must be set to 0.

Feature Values

The least significant 8 bits hold the value. The most significant 24 bits of the feature value should be set to 0.

Writer Responsibilities

A writer of the MPEG-4 video profile feature should record the 8 bits corresponding to the profile_and_level_indication from the visual_object_sequence, as defined in specification ISO/IEC 14496-2, found in the video parameters encoded in the esds of the MPEG-4 video codec sample description (with QuickTime codec type 'mp4v').

Feature Value Algorithm

The feature value is the profile_and_level_indication from the visual_object_sequence, as defined in specification ISO/IEC 14496-2, retrieved from the video parameters for the MPEG-4 video codec description.

Reader Responsibilities

A reader of this feature code should compare the recorded value with the set of profiles and levels supported by the reader.

Comments

This feature may be present only if MPEG-4 video is used. Normally, the video codec type profile entry will also record that MPEG-4 video is present, unless no codec types are present (when, for example, an exhaustive list cannot be formed).