---
title: Bytes per packet
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/sound_sample_description_version_1/bytes_per_packet
---

# Bytes per packet

For uncompressed audio, the number of bytes in a sample for a single channel.

## Overview

Overview This replaces the older sampleSize field, which is set to 16. This value is calculated by dividing the frame size by the number of channels. The same calculation is performed to calculate the value of this field for compressed audio, but the result of the calculation is not generally meaningful for compressed audio.

## See Also

### Data fields

- [Sample description size](quicktime-file-format/sound_sample_description_version_1/sample_description_size.md)
- [Data format](quicktime-file-format/sound_sample_description_version_1/data_format.md)
- [Reserved](quicktime-file-format/sound_sample_description_version_1/reserved.md)
- [Data reference index](quicktime-file-format/sound_sample_description_version_1/data_reference_index.md)
- [Version](quicktime-file-format/sound_sample_description_version_1/version.md)
- [Revision level](quicktime-file-format/sound_sample_description_version_1/revision_level.md)
- [Vendor](quicktime-file-format/sound_sample_description_version_1/vendor.md)
- [Number of channels](quicktime-file-format/sound_sample_description_version_1/number_of_channels.md)
- [Sample size](quicktime-file-format/sound_sample_description_version_1/sample_size.md)
- [Compression ID](quicktime-file-format/sound_sample_description_version_1/compression_id.md)
- [Packet size](quicktime-file-format/sound_sample_description_version_1/packet_size.md)
- [Sample rate](quicktime-file-format/sound_sample_description_version_1/sample_rate.md)
- [Samples per packet](quicktime-file-format/sound_sample_description_version_1/samples_per_packet.md)
- [Bytes per frame](quicktime-file-format/sound_sample_description_version_1/bytes_per_frame.md)
- [Bytes per sample](quicktime-file-format/sound_sample_description_version_1/bytes_per_sample.md)