---
title: Creating video tracks at 29.97 frames per second
framework: quicktime-file-format
role: article
role_heading: Article
path: quicktime-file-format/creating_video_tracks_at_2997_frames_per_second
---

# Creating video tracks at 29.97 frames per second

Configure your time-to-sample atom for 29.97 frames per second.

## Overview

Overview NTSC color video is not 30 frames per second (fps), but actually 29.97 fps. The previous example showed how the media time scale and the duration of the frames specify the video’s frame rate. By setting the media’s time scale to 2997 units per second and setting the frame durations to 100 units each, the effective rate is 29.97 fps exactly. In this situation, it is also a good idea to set the movie time scale to 2997 in order to avoid movie edits that don’t land on frame boundaries. The movie’s time scale is stored in the movie header atom. With a time scale of 2997 in the media header atom, the time-to-sample atom would contain the data values listed in following table.  |   |   |   |   |   |   |

## See Also

### Describing samples

- [Sample table atom ('stbl')](quicktime-file-format/sample_table_atom.md)
- [Seeking with a QuickTime file](quicktime-file-format/seeking_with_a_quicktime_file.md)
- [Sample description atom ('stsd')](quicktime-file-format/sample_description_atom.md)
- [Time-to-sample atom ('stts')](quicktime-file-format/time-to-sample_atom.md)
- [Creating video tracks at 30 frames per second](quicktime-file-format/creating_video_tracks_at_30_frames_per_second.md)
- [Creating sound tracks at 44.1 kHz](quicktime-file-format/creating_sound_tracks_at_441_khz.md)
- [Composition offset atom ('ctts')](quicktime-file-format/composition_offset_atom.md)
- [Composition shift least greatest atom ('cslg')](quicktime-file-format/composition_shift_least_greatest_atom.md)
- [Using composition offset and composition shift least greatest atoms](quicktime-file-format/using_composition_offset_and_composition_shift_least_greatest_atoms.md)
- [Sync sample atom ('stss')](quicktime-file-format/sync_sample_atom.md)
- [Partial sync sample atom ('stps')](quicktime-file-format/partial_sync_sample_atom.md)
- [Sample-to-chunk atom ('stsc')](quicktime-file-format/sample-to-chunk_atom.md)
- [Referencing two data files with a single track](quicktime-file-format/referencing_two_data_files_with_a_single_track.md)
- [Sample size atom ('stsz')](quicktime-file-format/sample_size_atom.md)
- [Chunk offset atom ('stco')](quicktime-file-format/chunk_offset_atom.md)