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SMP 351

H.264 Streaming Media Processor

The SMP 351 is a high performance recording and streaming processor for capturing and distributing AV sources and presentations as recorded media or live streaming. It incorporates Extron’s FlexOS®, a flexible platform for automating system operation. Accepting HDMI, component, composite, and optional 3G-SDI signals, it applies two-window processing to the selected sources. The SMP 351 can record and stream simultaneously and can stream at two different resolutions and bit rates concurrently using a range of transport protocols and session management options. Comprehensive control and configuration features make the SMP 351 integration-friendly, and easy to control and operate. Requiring no licensing fees, the SMP 351 has a low cost of ownership, making it a cost-effective solution for delivering presentations to a larger audience.

Approximate Storage Capacity in Hours Based on Video Bit Rate and Storage Device
Video Recording Bit Rate 32 GB USB Thumb Drive SMP 351 - 80 GB SSD SMP 351 - 400 GB SSD 1 TB Network Storage
10 Mbps 7 16 80 220
5 Mbps 15 32 160 450
2.5 Mbps 27 64 320 850
1 Mbps 64 160 800 2,000
Storage capacity estimate is calculated using the video recording bit rate plus 192 kbps for audio.


Key Features

  • Process two high resolution AV sources from up to five available input signals
  • Record and stream simultaneously
  • High quality scaling with flexible two-window management
  • Produce MP4 media or M4A audio files that are compatible with virtually any media player
  • Stream concurrently at two resolutions and bit rates from the same source
  • LinkLicense® for dual channel recording and streaming
  • Internal Solid State Storage — Save recorded data to reliable, internal storage, before transferring it to external destinations. Capacity of 128 GB (110 GB for recording files) or 480 GB (440 GB for recording files). Up to 40 hours of material can be saved to the 128 GB version, or 150 hours to the optional 480 GB version, encoded at 10 Mbps.
  • Audio mixing and advanced DSP functionality — Advanced audio DSP features offer control over audio levels, filtering, and dynamics for a quality audio experience without requiring the use of external mixing and DSP equipment.
  • New RTMP and RTMPS streaming protocols support popular third party hosting services — Supports RTMP push streaming with stream name or key, and user authentication for services like YouTube Live, Wowza, Twitch, IBM Cloud, and more. Supports streaming to Facebook Live using the RTMPS streaming protocol.
  • Flexible I/O ports for advanced AV system management — Install Extron FlexOS® applications onto the SMP 351 that interface with control ports and automate system operation.
  • License-free operation contributes to a low cost of ownership — With no required licensing or recurring support fees, the SMP 351 is a cost-effective solution for AV recording and streaming.
  • Save recordings to internal solid state drive, external USB storage, or a defined network storage directory — Recordings can be saved to pre-defined locations most convenient to users.
  • Chapter and event marking with thumbnails — Chapters or events can be marked, and JPEG image thumbnails in user defined resolutions are produced to promote efficient searching and scanning.
  • Record and stream at resolutions from 512x288 to 1080p/30 — Deliver superior quality video resolutions based on content or viewing requirements.
  • HDMI, component, composite, and optional 3G‑SDI input — Provides compatibility with common AV signal formats at resolutions up to 1920x1200 including 1080p/60. The SMP 351 3G‑SDI model offers an additional 3G‑SDI input connection.
  • Easy to configure and operate from the front panel or external control system — Ensure that presentations will be recorded and streamed, and valuable information will be documented and repurposed.
  • Define specific storage destinations for recorded data — Configure the SMP 351 to save recordings to specific storage directories based on the user environment or application requirements.
  • New Recording folder playback from SMD-series decoders — Recording folders on SMP 351 can now be mounted as network shares on SMD-series decoders for immediate playback of recordings.
  • HDMI-embedded stereo audio or analog stereo input and output signal support — Digital and analog audio signals are supported on the input channels and the output channel.
  • SDI audio de-embedding — Audio from an SDI source can be decoded and included in the audio mix along with either HDMI or analog sources.
  • New Supports the latest SMBv2 and SMBv3 protocols for secure file sharing in Windows environments
  • New Record audio as separate m4a file — In addition to storing video with included audio as m4p or m4v, the SMP 351 can also record and store audio as a separate m4a file.
  • Direct compatibility with hosted video platforms — Integrate publishing of recorded media directly to third party platforms such as Panopto, Kaltura, and Opencast.
  • New USB remote control port — Configure communication settings of the SMP processor using a keyboard and mouse viewing the embedded webpage. Connect the optional RCP 101 Series remote control panel for extended front panel operation and convenient thumb drive access, or the vRCP FlexOS App to remotely control the SMP processor on any device, using any browser.
  • New LinkLicense for Enhanced Panopto Features — This annual support license brings enhanced integration with the Panopto enterprise video platform to enable the SMP 351 to receive recording schedules from the Panopto video platform as well as streaming live video using RTMP and RTMPS to Panopto. Basic ad-hoc recording and publishing to Panopto and automating the system operation does not require a LinkLicense, but does require installation of the complimentary FlexOS® application framework.
  • New LinkLicense for Enhanced Kaltura Features — This annual support license enables enhanced integration with the Kaltura hosted video platform including scheduling, RTMP, and RTMPS streaming.
  • New LinkLicense for Horizontal Video Mirroring Upgrade — Streamlines recording by automatically flipping video horizontally to support lightboard or other applications that require reversal of the video image.
  • New iCalendar FlexOS App for ingesting iCalendar schedules — The iCalendar FlexOS App supports manual .ics file ingest and periodic schedule ingest from Outlook, Google Calendar and other scheduling services.
  • Schedule recording and streaming — Easily import and create recording schedules from Microsoft Exchange Server or using the iCalendar format.
  • RS‑232, Ethernet, and digital I/O control ports — Interface with control systems, sensors, or external devices used in the AV presentation environment.
  • Standards-based H.264 / MPEG‑4 AVC video compression — The SMP 351 supports use of the Baseline, Main, or High Profiles at Levels 4.x, or 3.x providing the ability to optimize video coding for use with various types of applications and decoding devices.
  • Channel A buffered input loop-through — Channel A input connectors include a buffered loop-through, for easy integration into new or legacy systems without the need for additional AV equipment such as distribution amplifiers.
  • Auto‑Image™ setup — When activated, the unit automatically analyzes the incoming video signal and then automatically adjusts sizing, centering, and filtering to optimize image quality. This can save time and effort in fine tuning displayed images.
  • Layout presets simplify control — The SMP 351 provides 16 standard or customizable presets that specify the size and positioning of AV sources and metadata, simplifying management and selection of layouts from the front panel or an external control system.
  • New Streaming presets — Thirty-two streaming presets combining stream destination, protocols, and parameters are available for quick and easy setup, and switching between live streams.
  • Encoding presets for quick recall of specific compression settings — The SMP 351 provides 16 standard or customizable presets for saving specific encoding settings such as H.264 profile, resolution, GOP, and bit rate session management configurations. Users can quickly switch between these archive and confidence encoder presets to support different applications.
  • Pull streaming transport protocols — RTP/RTSP, RTSP interleaved, and HTTP tunneled streaming transport protocols may be applied, based on various network conditions or to aid in firewall navigation.
  • New Push streaming transport protocols — Native RTP, RTMP, RTMPS, or MPEG 2 Transport Streams - TS, may be applied in unicast or multicast streaming applications. TS may be transported using UDP or RTP based on network conditions.
  • New Simultaneous unicast and multicast streaming per encode — The SMP 351 supports multiple concurrent stream modes per channel allowing simultaneous unicast and multicast RTSP pull streaming for each encode.
  • Session Announcement Protocol - SAP and Session Description Protocol - SDP — SAP and SDP protocols simplify identification of AV source streams in unicast or multicast push streaming applications.
  • Adjustable recording and streaming bit rates — Select video bit rates from 200 Kbps to 10 Mbps for video and audio bit rates from 16 Kbps to 384 Kbps based on the viewing application, storage, streaming, or network conditions.
  • Clean switching — Switching has a clean transition between sources. Distractions such as visual jumps, glitches, and distortion commonly experienced when switching between computer and video sources will not be experienced when using the SMP 351.
  • Recording metadata — Metadata can be assigned to make indexing and searching of recordings simple including: Title, Creator, Subject, Description, Publisher, Contributor, and Date.
  • Metadata text overlay — Data concerning the recording can be presented and clearly identified on recording layouts with AV sources and a background image.
  • Uploadable background image files — Upload PNG image files at resolutions up to 1920x1080 to identify organizational or event information.
  • On screen display information — Present device information and status on source images to aid in troubleshooting and fault finding activities.
  • Onscreen display video time reference — Text displaying a time and date reference can be presented within the onscreen display in the top left corner of the output signal.
  • Extended time recording — Recordings that would produce a media file size greater than 4 GB are bundled into a recording package of sequential MP4 files.
  • User configurable recording file size — Split recordings into specified files sizes.
  • Automatic file management for internal storage — Storage space is automatically created for new recordings when additional space is required. Files are deleted on a first-in, first-out basis. Important recordings can be locked and retained indefinitely until they are manually deleted.
  • System workflow alarms — Notify monitoring systems or support staff if disk space is low, encrypted signals are detected, AV signal errors occur, or other error conditions exist.
  • Alarm reporting — Automate communication with monitoring systems or support staff using email, SNMP traps, or Simple Mail Transfer Protocol - SMTP messages.
  • New "Publish Failure" Alarm — There is a new alarm notification for a publishing failure for transferring recordings. The new alarm can be found in the Configuration → Alarms and Traps → Alarm Message List.
  • New View Temperature SIS — SIS command to view system temperature. The new command information can be found in the SMP User Guide section Remote Communication and Control.
  • AAC audio encoding — Standards-based audio compression is used to provide compatibility with many devices. The bit rate can be adapted to different application requirements.
  • Video encoding quality controls including video resolution, video bit rate, frame rate, constant or variable bit rate control, GOP length, and audio bit rate — Several user controls are available to adjust encoding quality.
  • Auto Input Memory — When activated, the SMP 351 automatically stores size, position, and picture settings based on the incoming signal. When the same signal is detected again, these image settings are automatically recalled from memory.
  • Automatically manage EDID communication between connected devices with EDID Minder® — Automatically manage EDID communications between devices, EDID Minder, ensuring use of optimal signal formats.
  • Audio input gain and attenuation — Gain or attenuation can be adjusted for each input signal to eliminate noticeable differences when switching between sources or adjusting audio levels for the output stream.
  • Picture controls for brightness, contrast, signal sampling, and overscan — Sixteen user memory presets are available for each input to store all image settings.
  • Aspect ratio control — The aspect ratio of a source window can be controlled by selecting a FILL mode, which provides a full screen output, FOLLOW mode, which preserves the aspect ratio, or FIT mode, which maintains image uniformity and zooms into the source.
  • HDCP authentication and signal presence confirmation — Provides real-time verification of HDCP status for each digital video input and output signal. This allows for easy signal and HDCP verification through RS‑232 or Ethernet, providing valuable feedback to a system operator or helpdesk support staff.
  • HDCP Visual Confirmation — When HDCP‑encrypted content is transmitted to a non‑HDCP compliant display, a full‑screen green signal is sent to the display for immediate visual confirmation that protected content cannot be viewed on that display.
  • Quad standard video decoding — A digital, five-line adaptive comb filter decodes NTSC 3.58, NTSC 4.43, PAL, and SECAM for integration into systems worldwide.
  • Internal test patterns for setup — The SMP 351 offers test patterns as well as on-screen display - OSD data overlay including timestamp, number of connected users, CPU usage, network status, disk free file space, audio level, and system information to aid in calibration and setup.
  • Front panel lockout — This feature locks out either all front panel functions, Menu functions only, or all but recording transport controls. All functions are available through Ethernet, USB, and RS‑232 control.
  • Ethernet monitoring and control — The SMP 351 is controllable over Ethernet, supporting configuration and real-time management from a control system.
  • Embedded Web interface — Provide an intuitive Web interface with an embedded video window for viewing the live stream, as well as source input and encoding adjustments.
  • RS-232 control port — Enable the use of serial commands for integration into a control system. Extron products use the SIS™ - Simple Instruction Set command protocol, a set of basic ASCII commands that allow for quick and easy programming.
  • USB keyboard and mouse ports — Configure communication settings of the SMP 351 using a keyboard and mouse viewing the embedded webpage from the HDMI output connection.
  • LockIt® HDMI cable lacing brackets included
  • Rack-mountable 1U, full rack width metal enclosure
  • Internal Extron Everlast™ power supply — Provides worldwide power compatibility, with high‑demonstrated reliability and low power consumption for reduced operating cost
  • Extron Everlast Power Supply is covered by a 7‑year parts and labor warranty
  • Register online for Extron Electronics Training and Updates