HD-SDI audio/video H.264 encoder | Model 2224

Model 2224 HD-SDI audio/video H.264 encoder
  • High quality, High Profile H.264 HD/SD encoding
  • Transport stream format
  • HD (1080p/1080i, 720p) and SD (NTSC, PAL)
  • Audio from SDI or external
  • Audio level meter
  • Blu-ray compatible
  • HD/SD uncompressed frame capture
  • Full screen 16-bit color graphics/text overlays with transparency
  • Low latency uncompressed preview stream
  • Small Form Factor


Model 2224 is a USB 2.0 audio/video H.264 MPEG encoder with full screen text/graphics overlay and one SDI input that supports a variety of video resolutions, including 1080p/1080i, 720p and NTSC/PAL. The encoder outputs H.264 High Profile Level 4 for HD and Main Profile Level 3 for SD, multiplexed in MPEG transport stream format. The board's versatile overlay generators, integral HD/SD raw frame grabber, and live preview stream make it ideally suited for a wide range of video processing applications, including High Profile DVRs, NVRs and stream servers.

2224 Simplified Block Diagram


High Profile H.264 Encoding

Broadcast quality video compression is achieved by using High Profile H.264 encoding, which is unavailable in many lower quality encoders that implement only Baseline or Main profiles. Streams recorded from the 2224 can be burned to Blu-ray disks without transcoding.


Stereo or mono audio may be output to the encoded stream. The audio can be sourced from embedded SDI audio, external line input, or optional on-board microphone preamplifier, which can be directly interfaced to an XLR3 low-level microphone. The board employs special hardware and advanced techniques to keep audio synchronized to video, thereby eliminating the lip sync errors that commonly plague software-based solutions.

Frame Grabber

A frame buffer is provided to capture uncompressed snapshots of individual frames. The frame buffer has a dedicated overlay generator that allows frames to be overlaid prior to capture. Captured snapshots can be sent over USB concurrently with the H.264 transport stream.

Uncompressed Capture

The board can send an uncompressed, down-scaled video stream over USB to enable low-latency video previewing on the host computer with minimal CPU overhead. The uncompressed preview stream can flow over USB concurrently with the H.264 transport stream and a captured snapshot.

Video Overlay

Model 2224 supports text and graphic overlays at 16-bit color resolution with transparency. Any true-type font can be displayed, and graphics can be displayed from standard BMP files as well as generated on the fly by Sensoray's 2224 API, which allows graphics to be easily and quickly placed and moved anywhere on the screen.

Eight overlappable, rectangular, hardware-managed overlay regions are supported. Each region can occupy up to full screen size and may be applied to H.264 and live preview streams, snapshot frame, or both. Real-time update rates are possible for small regions, whereas update rates for large regions may vary depending on computer speed and USB activity.


Input Channels 1 SDI HD/SD, HD-BNC connector
Compliance SMPTE 292M, SMPTE 344M, and SMPTE 259M, ITU-R BT.1120, and ITU-R BT.656
Input Channels 1 stereo/mono
Input Sources Ancillary data embedded in SDI input
Stereo line input, ±1.0V
Balanced XLR3 low-level compatible (requires optional mic preamp)
H.264 Encoder
H.264 Conformance HD: ISO/IEC14496-10 (H.264/AVC) High Profile Level 4.0
SD: ISO/IEC14496-10 (H.264/AVC) Main Profile Level 3.0
Video Resolutions /
Frame Rates /
Bit Rates
1920x1080p, 24/23.98 Hz, 2Mbps to 17Mbps
1920x1080i, 30/29.97/25 Hz, 2Mbps to 17Mbps
1280x720p, 60/59.94/50/24/23.98, 2Mbps to 17Mbps
720x480i, 29.97 Hz (NTSC), 1Mbps to 10Mbps
720x576i, 25 Hz (PAL), 1Mbps to 10Mbps
Audio Sampling Rate 48 kHz
Audio Bit Rates 64, 96, 112, 128, 160, 192, 224, 256 kbps
Audio Conformance MPEG-1 Audio Layer 2
Stream Format H.264 inside MPEG transport stream
Color Resolution 16 bits
Hardware Regions 8 overlappable, up to full screen size. Instantaneous updates via shadow RAM
Video Formats
(H.264 encode)
1920x1080p, 24/23.98 Hz
1920x1080i, 30/29.97/25 Hz
1280x720p, 60/59.94/50
720x480i, 29.97 Hz (NTSC)
720x576i, 25 Hz (PAL)
Video Formats
(live preview and snapshots)
1920x1080p, 30/29.97/24/23.98 Hz
1920x1080i, 30/29.97/25 Hz
1280x720p, 60/59.94/50
720x480i, 29.97 Hz (NTSC)
720x576i, 25 Hz (PAL)
Host Interface USB 2.0
Power 5W, +5V @ 1A
Operating Temperature 0 to 70°C
Mechanical Dimensions Pico-ITX: 3.9 x 2.8 inches (10 x 7.2 cm)


File Version Type Size
2224 Users ManualPDF609 KB
2224 Windows Software Manual1.0.2PDF649 KB
2224 Linux Software Manual1.0.2PDF409 KB
Mechanical Drawings
2224 Mechanical Drawing1.0.0PDF67 KB
2224 tech support wiki
FAQs, examples and additional information


File Version Type Size
2224/2226 Windows Software Development Kit1.0.13ZIP31.15 MB
2224/2226 Linux Software Development Kit1.1.7GZ3.93 MB
2224/2226 Firmware Update1.0.14ZIP1.35 MB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
2224HD-SDI audio/video H.264 encoder$1806$1642

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