Roland SR-20HD Direct Streaming AV Mixer

SR-20HD | Direct Streaming AV Mixer

Livestream Directly to Multiple Platforms—No Computer Required

The compact SR-20HD Direct Streaming AV Mixer makes it easy to produce content and encode livestreams for your business or organization—without the need for a computer. Just connect your AV devices and securely stream directly to multiple platforms over LAN. You can also record directly to SDXC media for archiving and later distribution. Everything you need is integrated into a single portable unit that anyone can use with minimal training. When consistency, dependability, and network security are top priorities, the SR-20HD delivers professional results every time.

Enterprise streaming solution for direct livestreaming without a PC

Built-in encoders for transmitting two simultaneous livestreams up to 1080p/60 FPS

Adaptive Bitrate function reduces freezing and dropouts due to bandwidth issues

Safety Delay function to keep accidental moments from being broadcast

Scene function for executing multiple tasks with a single touch

Record streams directly to an SDXC card for archiving, editing, and distribution

Ease your workflow with Video Auto Switching and Auto Mixing functions

Play sound effects, still images, and video sources from an SDXC card to enhance your livestreams

LCD monitor for checking video I/O and delivery status in real time

Three video inputs: two HDMI and one USB video class

Two HDMI outputs: Main and Preview

High-quality audio mixer with eight input channels for mics and line-level devices

Version 2.0 New Features

SRT Input and Output —Enables secure video and audio transmission over LAN/internet connections.

Built for Success

The SR-20HD is designed to make everyone successful with livestream operation and management, regardless of experience. It combines dual streaming encoders, simple video switching, audio mixing, and recording support in one unit, simplifying production tasks and reducing points of failure.

Plug In and Stream

Using the two HDMI inputs, you can connect common video sources such as cameras, smartphones, tablets, and computers running presentation software. In addition, a wide range of audio inputs are available for mics, music players, electronic musical instruments, and more.

Once everything is plugged in, simply connect to your network router and begin livestreaming with team members, clients, or students on Facebook, YouTube Live, Twitch, or by RTMP to your CDN.

Secure and Reliable Operation

Packed with advanced Roland A/V technologies, the SR-20HD reduces the need for technical support and experienced staff members. Automatic functions run in the background to eliminate dropped streams and help protect your organization from broadcasting inappropriate content. And since all streaming tasks are handled within the SR-20HD, there’s no risk of malware and other issues that come with computer-based streaming on your enterprise network.

Adaptive Bitrate

The SR-20HD’s unique Adaptive Bitrate function monitors the quality of the network connection and automatically adjusts the streaming rate to reduce interruptions due to bandwidth issues.

Mobile Phone Tethering

A mobile phone with a 4G or 5G data plan can be used as the primary streaming connection or a redundant backup. Should anything happen to your main hardwired network connection, the SR-20HD will automatically switch to the tethered mobile phone over USB.

SRT Support

The SR-20HD supports SRT (Secure Reliable Transport), an open-source standard for AVoIP that provides secure encrypted audio and video transmission over IP networks. It also offers future-proof connectivity within installed system configurations. SRT allows you to seamlessly extend your SR-20HD production capabilities via LAN or an internet connection. Access camera images from remote locations and switch them along with local HDMI sources. And send a dedicated SRT video output to an external destination, such as another building at the production location.

SRT (Secure Reliable Transport) is an open-source video transport protocol and technology stack developed by Haivision.

SRT Setup Guide

Safety Delay

With the SR-20HD, you can confidently stream unscripted events and prevent offensive content from being broadcast to your audience. The Safety Delay function buffers up to 60 seconds of video and audio, allowing you to switch to a still image or mute the sound if anything goes wrong.

Dual Streaming Destinations

Encode and broadcast livestreams to two independent channels on the same platform to reach a wider audience or create a backup for archiving or later distribution.

Panel Lock

Panel Lock prevents users from accidentally changing settings that could disrupt a broadcast. You can disable access to a wide range of hardware controls and menu parameters on an individual basis, leaving only the essential functions needed for the livestream.

Simplified Recording and Playback

The SR-20HD’s onboard recorder lets you capture H.264 MP4 video* to an SDXC card for later editing or uploading to YouTube or enterprise intranets. In addition, stereo WAV audio can be captured independently for podcasts and other audio-driven media. It’s also possible to access media stored on the SDXC card to bring higher production values to your presentations.**

*The recording bitrate is the same as the livestream encoding bitrate.

**SDXC video playback is only available when streaming in Standard mode.

Advanced Audio Control

The SR-20HD covers the divergent audio needs of single presenters, conference panels, and even music performances. Inputs for up to four professional XLR microphones, line-level signals, and a headset mic provide multiple ways to connect all common analog sources. You can also mix in digital audio from HDMI and USB sources, plus audio from videos and music files stored on an SDXC card.

Make quick volume adjustments for individual sources using the dedicated faders and knobs. And go deeper with EQ and dynamics processing via the preview display and F1–F4 encoders. You also have five user-assignable function buttons to speed up your workflow, providing quick access to Auto Mixing, audio/video playback, F1–F4 functions, and more.

Automated Switching and Mixing

With a variety of powerful tools, you can automate video switching and audio mixing tasks to ease your workload. This is particularly helpful when you’re also a presenter, allowing you to stay focused on delivering your message to the audience.

Video Auto Switching

Change video input sources at predetermined time intervals to make your presentation more dynamic.

Auto Mixing

The Auto Mixing function ensures that the mix between your connected microphones remains balanced. You can set specific inputs to take priority when someone starts to speak, and other audio levels are automatically reduced as needed.

Follow the Source

The SR-20HD makes it simple to broadcast with multiple presenters. With the Audio Follows Video function, the corresponding audio automatically follows when you switch to a different video source. Conversely, the Video Follows Audio function switches video based on who’s currently speaking.

Scenes

With Scenes in the SR-20HD, it’s easy to bring pro production values to your livestreams by executing complex switching functions all at once. Set up and store five preset arrangements of layered sources and display them in customizable inset windows. Then use the dedicated Scene buttons to switch between them and keep the audience engaged during the broadcast.

Hi-Res Streaming for Live Action

The SR-20HD’s Standard mode supports 1080p resolution at 30 FPS, which provides excellent quality for most livestreaming applications. If you’re broadcasting live sports or other events with quick movement, you can select High Quality mode to increase the frame rate to 60 FPS and reduce motion blur. It’s also possible to extend your livestreaming capabilities with the SR-20HD’s SRT support. Please refer to the SR-20HD Reference Manual for details.

Note: The SR-20HD’s USB video input and SDXC card functions are disabled in High Quality mode.

Input Expansion

If you ever need to connect more sources, you can expand your possibilities with a VR-4HD , or UVC-01 . These Roland A/V products allow you to send high-quality, uncompressed video or audio to the SR-20HD’s USB video input.*

*USB video input is only available when streaming in Standard mode.

Panel Design

Front

Rear

Block diagram

Dimensions

Company names and product names appearing in this document are registered trademarks or trademarks of their respective owners.

Video

Video Processing

4:2:2 (Y/Pb/Pr), 8-bit

Number of video channels

2 channels

Input Formats

HDMI IN 1--2 connectors:

720/59.94p, 720/50p, 1080/59.94i, 1080/50i, 1080/59.94p, 1080/50p

SVGA (800 x 600/60Hz), XGA (1024 x 768/60Hz),

WXGA (1280 x 800/60Hz), FWXGA (1366 x 768/60Hz),

SXGA (1280 x 1024/60Hz), SXGA+ (1400 x 1050/60Hz),

UXGA (1600 x 1200/60Hz), Full HD (1920 x 1080/60Hz),

WUXGA (1920 x 1200/60Hz)

* The refresh rate is the maximum value of each resolution.

* Conforms to CEA-861-E, VESA DMT Version 1.0 Revision 11.

* 1920 x 1200/60 Hz: Reduced blanking

* The input interlaced video signal is converted to progressive video signal by internal processing.

* HDCP is not supported.

Output Formats

HDMI OUT MAIN, PVW connectors:

1080/59.94p, 1080/50p

* The video signal frame rate can be selected at the SYSTEM menu (59.94 Hz or 50 Hz).

* HDCP is not supported.

Stream and Video Recorder

Protocols: RTMP, RTMPS, SRT (Caller, Listener)

Container: FLV (RTMP, RTMPS), MPEG2-TS (SRT)

Recording File Format: MP4

Codec:

H.264, Profile High/Main/Baseline

720/59.94p, 720/50p, 1080/59.94p, 1080/50p

Target bitrate up to 20,000 kbps

AAC-LC, 16 bits, 48 kHz, stereo, target bitrate up to 384 kbps

* Stream and Video Recorder functions are not available in "SRT In only" mode.

Audio Recorder

File Format: WAV

Codec: Linear PCM, 16 bits, 48 kHz, stereo

* Audio Recorder function is not available in "SRT In only" mode.

Video Player

File Format: MP4

Codec:

H.264

Maximum 1080/29.97p, Progressive

Average bit rate of 10,000 kbps or less

AAC LC, 16 bits, 48kHz, Stereo

* Video Player function is not available in "High Quality" mode or "SRT In only" mode.

SRT In

Protocols: SRT (Caller, Listener)

Container: MPEG2-TS

Codec:

H.264

Maximum 1080/60p, Progressive

Average bit rate of 20,000 kbps or less

AAC LC, 16 bits, 48 kHz, Stereo

* SRT In function is not available in "High Quality" mode.

* In "Standard" mode, the SRT In is limited to maximum 1080/30p, average bit rate of 10,000 kbps or less.

USB Video or Audio

USB Video: Maximum 720p29.97, Uncompressed (YUY2)

USB Audio: Linear PCM, 16 bit, 48 kHz, stereo

* You can use either USB video or USB audio.

* The USB VIDEO IN Mode can be selected at the SYSTEM menu (Video Only or Audio Only).

* The USB STREAM output of the following Roland products can be used with the SR-20HD:

VR-4HD, UVC-01

* USB Video and Audio functions are not available in "High Quality" mode or "SRT In only" mode.

Import Still Image

PNG File (.png), Maximum 1920 x 1080 pixels, 24-bit color (alpha channel not supported)

JPEG File (.jpg .jpeg), Maximum 1920 x 1080 pixels, 24-bit color

Save Still Image

JPEG File (.jpg), 1920 x 1080 pixels, 24-bit color

Video Effects

Scene: Picture in Picture, Split, Picture by Picture

Transition: Black fade, Mix fade

Key Composition: Luminance key, Chroma key

Other: Output fade, Test pattern output, Stream Delay

Audio

Audio Processing

24 bits, 48 kHz

Number of audio channels

15 channels

Audio Formats

HDMI IN/OUT connectors: Linear PCM, 24 bit, 48 kHz, stereo

Audio Effects

Delay, High Pass Filter, Gate, Compressor, Equalizer, Limiter, Test tone output

Audio Player

File format: WAV (Linear PCM, 16 bits, 48 kHz/44.1 kHz, stereo)

Common Section

Recording Media

SDXC/SDHC card (sold separately)

* SDXC card is required for video recording. When using the SR-20HD, you must always install an SD card.

Other Functions

Panel lock function

EDID emulator

Connectors

Input Connectors

HDMI IN 1--2 connectors: HDMI type A (Multi-format supported)

AUDIO IN 1--4 jacks: Combo type

XLR type: balanced, phantom power (DC 48 V, 10 mA), (1 GND, 2 HOT, 3 COLD)

1/4-inch TRS phone: balanced

Output Connectors

HDMI OUT MAIN, PVW connectors: HDMI type A

LINE OUT jack: RCA phono type

PHONES jack: Stereo miniature phone type

Input/Output Connector

HEADSET jack: Stereo miniature phone type (3.5 mm, 1/8-inch, TRRS 4-pole, CTIA)

Other Connectors

USB VIDEO IN port: USB A (USB 3.0)

USB CONTOL port: USB A (USB 2.0)

LAN (DIRECT STREAM) port: RJ-45, 1000BASE-T (for Live Streaming and SRT In/Out)

DC IN jack

Audio Input/Output Characteristics

Nominal Input Level

AUDIO IN 1--4 jacks: -52 to +4 dBu (Maximum Input level: +24 dBu)

LINE IN jack: -10 dBu (Maximum Input level: +10 dBu)

Input Impedance

AUDIO IN 1--4 jacks (XLR type, with phantom power): 5 k ohms

AUDIO IN 1--4 jacks (XLR type, without phantom power): 7 k ohms

AUDIO IN 1--4 jacks (TRS 1/4-inch phono type): 7 k ohms

LINE IN jack: 18 k ohms

Nominal Output Level

AUDIO OUT jack: -10 dBu (Maximum Output level: +10 dBu)

PHONES jack: 72 mW + 72 mW (32 ohms)

Output Impedance

AUDIO OUT jack: 1 k ohm

Others

Display

4.3 inches TFT color LCD: 480 x 272 dots

Power Supply

AC adaptor

Current Draw

3.5 A

Power Consumption

42 W

Operation Temperature

+0 to +40 degrees Celsius

+32 to +104 degrees Fahrenheit

Dimensions

300 (W) x 215 (D) x 86 (H) mm

11-13/16 (W) x 8-1/2 (D) x 3-7/16 (H) inches

Weight (excluding AC adaptor)

2.4 kg

5 lbs 5 oz

Startup Guide

Leaflet "USING THE UNIT SAFELY"

AC adaptor

Power cord

* 0 dBu = 0.775 Vrms

* The terms HDMI, HDMI High-Definition Multimedia Interface, HDMI Trade dress and the HDMI Logos are trademarks or registered trademarks of HDMI Licensing Administrator, Inc.

* SRT (Secure Reliable Transport) is an open source video transport protocol and technology stack, developed and pioneered by Haivision.