---
title: MPEG-4 video object type
framework: quicktime-file-format
role: article
role_heading: Article
path: quicktime-file-format/mpeg-4_video_object_type
---

# MPEG-4 video object type

## Overview

Overview Feature Values The value is a video object type constant that indicates a set of video tools. The list of video object type constants is defined in specification ISO/IEC 14496-2, subclause 6.3.3. The least significant 8 bits hold the value. The most significant 24 bits should be set to 0. Example: The Simple Object Type video object is indicated by the value 1. Writer Responsibilities A writer of the MPEG-4 Video Object Type feature should record the 8 bits corresponding to the video_object_type_indication found in the VideoObjectLayer within the ES_descriptor’s video DecoderSpecificConfig. The most significant 24 bits of the value should be set to 0. This feature should be written only for MPEG-4 video of video object type 1 (Video ID). If the MPEG-4 video does not use Video ID (1) for visual_object_type, the esds will have no VideoObjectLayer and consequently no video_object_type_indication. In this case, no MPEG-4 Video Object Type feature should be written. note: A writer that records the MPEG-4 Video Object Type feature for encoded video using the Video ID visual object type is encouraged to write the MPEG-4 Video Codec and MPEG-4 Video Profile features as well. Feature Value Algorithm The MPEG-4 video object type is the least significant 8 bits of the video_object_type_indication found in the VideoObjectLayer. See ISO/IEC 14496-2, subclause 6.2.3. The VideoObjectLayer is found in the MPEG-4 Elementary Stream Descriptor Atom within the 'esds' sample description atom of the video sample description for the QuickTime video codec of type 'mp4v'. Reader Responsibilities A reader of this feature code should compare the recorded value with the set of MPEG-4 video tools supported by the reader.

## See Also

### Setting features

- [Table of features](quicktime-file-format/table_of_features.md)
- [Maximum video bit rate](quicktime-file-format/maximum_video_bit_rate.md)
- [Average video bit rate](quicktime-file-format/average_video_bit_rate.md)
- [Maximum audio bit rate](quicktime-file-format/maximum_audio_bit_rate.md)
- [Average audio bit rate](quicktime-file-format/average_audio_bit_rate.md)
- [QuickTime video codec type](quicktime-file-format/quicktime_video_codec_type.md)
- [QuickTime audio codec type](quicktime-file-format/quicktime_audio_codec_type.md)
- [MPEG-4 video profile](quicktime-file-format/mpeg-4_video_profile.md)
- [MPEG-4 video codec](quicktime-file-format/mpeg-4_video_codec.md)
- [MPEG-4 audio codec](quicktime-file-format/mpeg-4_audio_codec.md)
- [Maximum video size in a movie](quicktime-file-format/maximum_video_size_in_a_movie.md)
- [Maximum video size in a track](quicktime-file-format/maximum_video_size_in_a_track.md)
- [Maximum video frame rate in a single track](quicktime-file-format/maximum_video_frame_rate_in_a_single_track.md)
- [Average video frame rate in a single track](quicktime-file-format/average_video_frame_rate_in_a_single_track.md)
- [Video variable frame rate indication](quicktime-file-format/video_variable_frame_rate_indication.md)