---
title: Extended size
framework: QuickTime File Format
role: symbol
role_heading: Data field
path: quicktime-file-format/movie_data_atom/extended_size
---

# Extended size

A 64-bit integer that specifies the number of bytes in this media data atom.

## See Also

### Data fields

- [Size](quicktime-file-format/movie_data_atom/size.md)
- [Type](quicktime-file-format/movie_data_atom/type.md)
- [Movie media data](quicktime-file-format/movie_data_atom/movie_media_data.md)