gortsplib

RTSP 1.0 client and server library for the Go programming language, written for MediaMTX.

Go ≥ 1.23 is required.

Features:

• Client
  • Query servers about available media streams
  • Read media streams from a server ("play")
    • Read streams with the UDP, UDP-multicast or TCP transport protocol
    • Read TLS-encrypted streams (TCP only)
    • Switch transport protocol automatically
    • Read selected media streams
    • Pause or seek without disconnecting from the server
    • Write to ONVIF back channels
    • Get PTS (relative) timestamp of incoming packets
    • Get NTP (absolute) timestamp of incoming packets
  • Write media streams to a server ("record")
    • Write streams with the UDP or TCP transport protocol
    • Write TLS-encrypted streams (TCP only)
    • Switch transport protocol automatically
    • Pause without disconnecting from the server
• Server
  • Handle requests from clients
  • Validate client credentials
  • Read media streams from clients ("record")
    • Read streams with the UDP or TCP transport protocol
    • Read TLS-encrypted streams (TCP only)
    • Get PTS (relative) timestamp of incoming packets
    • Get NTP (absolute) timestamp of incoming packets
  • Serve media streams to clients ("play")
    • Write streams with the UDP, UDP-multicast or TCP transport protocol
    • Write TLS-encrypted streams (TCP only)
    • Compute and provide SSRC, RTP-Info to clients
    • Read ONVIF back channels
• Utilities
  • Parse RTSP elements
  • Encode/decode RTP packets into/from codec-specific frames

Table of contents

• Examples
• API Documentation
• RTP Payload Formats
• Specifications
• Related projects

Examples

• client-query
• client-play
• client-play-timestamp
• client-play-options
• client-play-pause
• client-play-to-record
• client-play-backchannel
• client-play-format-av1
• client-play-format-av1-to-jpeg
• client-play-format-g711
• client-play-format-h264
• client-play-format-h264-to-jpeg
• client-play-format-h264-to-disk
• client-play-format-h264-mpeg4audio-to-disk
• client-play-format-h265
• client-play-format-h265-to-jpeg
• client-play-format-h265-to-disk
• client-play-format-lpcm
• client-play-format-mjpeg
• client-play-format-mpeg4audio
• client-play-format-mpeg4audio-to-disk
• client-play-format-opus
• client-play-format-opus-to-disk
• client-play-format-vp8
• client-play-format-vp9
• client-record-options
• client-record-pause
• client-record-format-av1
• client-record-format-g711
• client-record-format-h264
• client-record-format-h264-from-disk
• client-record-format-h265
• client-record-format-lpcm
• client-record-format-mjpeg
• client-record-format-mpeg4audio
• client-record-format-opus
• client-record-format-vp8
• client-record-format-vp9
• server
• server-tls
• server-auth
• server-record-format-h264-to-disk
• server-play-format-h264-from-disk
• server-play-backchannel
• proxy
• proxy-backchannel

API Documentation

Click to open the API Documentation

RTP Payload Formats

In RTSP, media streams are transmitted by using RTP packets, which are encoded in a specific, codec-dependent, format. This library supports formats for the following codecs:

Video

codec	documentation	encoder and decoder available
AV1	link	✔️
VP9	link	✔️
VP8	link	✔️
H265	link	✔️
H264	link	✔️
MPEG-4 Video (H263, Xvid)	link	✔️
MPEG-1/2 Video	link	✔️
M-JPEG	link	✔️

Audio

codec	documentation	encoder and decoder available
Opus	link	✔️
Vorbis	link
MPEG-4 Audio (AAC)	link	✔️
MPEG-1/2 Audio (MP3)	link	✔️
AC-3	link	✔️
Speex	link
G726	link
G722	link	✔️
G711 (PCMA, PCMU)	link	✔️
LPCM	link	✔️

Other

codec	documentation	encoder and decoder available
MPEG-TS	link

Specifications

name	area
RFC2326, RTSP 1.0	protocol
RFC7826, RTSP 2.0	protocol
RFC8866, SDP: Session Description Protocol	SDP
RTP Payload Format For AV1 (v1.0)	payload formats / AV1
RTP Payload Format for VP9 Video	payload formats / VP9
RFC7741, RTP Payload Format for VP8 Video	payload formats / VP8
RFC7798, RTP Payload Format for High Efficiency Video Coding (HEVC)	payload formats / H265
RFC6184, RTP Payload Format for H.264 Video	payload formats / H264
RFC3640, RTP Payload Format for Transport of MPEG-4 Elementary Streams	payload formats / MPEG-4 audio, MPEG-4 video
RFC2250, RTP Payload Format for MPEG1/MPEG2 Video	payload formats / MPEG-1 video, MPEG-2 audio, MPEG-TS
RFC2435, RTP Payload Format for JPEG-compressed Video	payload formats / M-JPEG
RFC7587, RTP Payload Format for the Opus Speech and Audio Codec	payload formats / Opus
Multiopus in libwebrtc	payload formats / Opus
RFC5215, RTP Payload Format for Vorbis Encoded Audio	payload formats / Vorbis
RFC4184, RTP Payload Format for AC-3 Audio	payload formats / AC-3
RFC6416, RTP Payload Format for MPEG-4 Audio/Visual Streams	payload formats / MPEG-4 audio
RFC5574, RTP Payload Format for the Speex Codec	payload formats / Speex
RFC3551, RTP Profile for Audio and Video Conferences with Minimal Control	payload formats / G726, G722, G711, LPCM
RFC3190, RTP Payload Format for 12-bit DAT Audio and 20- and 24-bit Linear Sampled Audio	payload formats / LPCM
Codec specifications	codecs
Golang project layout	project layout

Related projects

• MediaMTX
• gohlslib
• mediacommon
• pion/sdp (SDP library used internally)
• pion/rtp (RTP library used internally)
• pion/rtcp (RTCP library used internally)