---
title: RTP sequence number
framework: quicktime-file-format
role: symbol
role_heading: Data field
path: quicktime-file-format/packet_entry/rtp_sequence_number
---

# RTP sequence number

A 16-bit integer specifying the RTP sequence number for this packet.

## Overview

Overview The RTP server adds a random offset to this sequence number before transmitting the packet. This field allows re-transmission of packets—for example, the same packet can be assembled with the same sequence number and a different (later) packet transmission time. A text sample with a duration of 5 minutes can be retransmitted every 10 seconds, so that clients that miss the original sample transmission (perhaps they started playing the movie in the middle) will be refreshed after a maximum of 10 seconds.

## See Also

### Data fields

- [Relative packet transmission time](quicktime-file-format/packet_entry/relative_packet_transmission_time.md)
- [RTP header info](quicktime-file-format/packet_entry/rtp_header_info.md)
- [Flags](quicktime-file-format/packet_entry/flags.md)
- [Entry count](quicktime-file-format/packet_entry/entry_count.md)
- [Extra information TLVs](quicktime-file-format/packet_entry/extra_information_tlvs.md)
- [Data table](quicktime-file-format/packet_entry/data_table.md)