In English
Sensoray 2246 /2246s Модуль видеозахвата HD и декодирования HD-видео (до 1920x1080i) в формат MPEG 1/2/4 с интерфейсом USB
Model 2246 | USB HD Video Processor & Capture Card
Model 2246s | USB HD Video Processor & Capture Card
Руководство по программированию (англ.), PDF
SDK и драйверы для Windows (ZIP)
Features
Video overlay up to full screen at up to 1920x1080
SDI (HD/SD) and analog inputs
DVI, SDI (HD/SD), and analog outputs
Prescaled SD A/V compression engine with MPEG-1/2/4 output
Up/downscaling on DVI and analog outputs
Captures uncompressed HD/SD frames
Generates "freeze frame" video from captured frames
Video "zoom" on MPEG stream and DVI output
Isolated general-purpose digital I/O: 8 in / 4 out
USB 2.0 interface
Description
The 2246 is a USB 2.0 A/V (audio and video) MPEG-1/2/4 (MPEG ISO 14496-2) processor that supports multiple video input formats, including SDI 1080i, 720p, and both SDI and analog NTSC/PAL SD. It compresses video and stereo audio to MPEG-1 system stream, MPEG-2 program stream, or MPEG-4 (AVI), and sends the resulting stream onto USB. At the same time, it can capture uncompressed full-frame "snapshots" and send them over USB, while it simultaneously generates live or "freeze frame" video on its four video outputs.
Simplified 2246 dataflow diagram
At any time, one HD or SD video source (HD-SDI/SD-SDI, S-Video, or composite) and one audio source (line or high level microphone) is selected for processing. The selected video is copied to three independent overlay generators, which in turn produce three new uncompressed, overlaid video streams. These three video streams are then processed in parallel by the compression engine (along with audio), video output generators, and frame capture subsystems.
The compression engine simultaneously compresses SD video and stereo or mono audio. When an HD video source is selected, the overlaid video is downscaled to SD before encoding.
All four video outputs (HD-SDI/SD-SDI, DVI, SVIDEO, and composite) function simultaneously regardless of the video source format. In the case of HD sources, the video is downscaled for compatibility with composite and S-Video outputs. SD sources are upscaled as appropriate for the DVI output. The DVI output, which may be formatted for 1080i, 1024x1280p, or NTSC/PAL resolution, incorporates frame rate conversion to ensure synchronization to standard displays.
A frame buffer is provided to capture uncompressed snapshots of individual frames. Captured frames can be sent over USB concurrently with the video stream, and may also be sent to the video outputs as "freeze frame" video.
The 2226 sports a "zoom" feature on the MPEG and DVI output streams. Video can be stretched up to 2.5x horizontally and 5x vertically, with origin moved to any arbitrary position. Video zoom is performed by the scaler blocks.
The unit is available in a robust enclosure (model 2246S) or as a stand-alone board (model 2246) for OEM applications. An optional termination board adapter, Model 2246TA, can be used to conveniently break out connections from Model 2246.
Video Overlay
The 2246 supports text and graphic overlays at 16-bit color resolution. As many as eight hardware-managed overlay regions may be defined, with unlimited region overlap. Each region may have any rectangular size up to that of the video frame. Real-time update rates are possible for small overlay regions, while update rates for larger regions vary depending on computer speed and usb activity.
Each overlay region may be applied to the compressed stream, the live video output stream, the "freeze frame" video, or any combination of these. In the case of the MPEG stream, the video is overlaid before it is compressed.
Sample snapshots of HD full screen overlay: example 1 ~ example 2
Video pass through
The board includes special circuitry which will, in conjuction with an external power supply, enable video inputs to pass through directly to the video outputs (without reformatting). This feature is useful in the event of primary power loss or if the host computer is offline.
General purpose digital I/O
The 2246 has eight digital inputs and four digital outputs for general purpose use. The inputs are optically isolated, while the outputs employ compact electromechanical relays. Each output relay has two form-C contacts.
SpecificationsVideo Inputs
HDTV 1920 x 1080 SDI | 1080i 25/30 fps
Video formats supported
HDTV SMPTE 295M, SMPTE 274M, SMPTE 296M
SD-SDI SMPTE 259M
HD-SDI SMPTE 292M
SDTV SMPTE 125
SDTV ITU-R BT 601.5
SDI input specifications
Serial input data rate (max) 1.485 Gbps
Serial input voltage swing (max) 950 mVpp
Input impedance 75 Ohm, single ended
Composite
NTSC 640 x 480, 30 fps, +/- 1 Vpp
PAL 704 x 544, 25 fps, +/- 1 Vpp
S-Video 1.18 Vpp (when load - 75 Ohm)
Audio
Channels 2 stereo
Analog input voltage 1 Vpp
Input resistance 10 K Ohm, single ended
Video Outputs
DVI for LCD displays 60 Hz, 1280 x 1024 display supported at all input resolutions
DVI output voltage (max) 3.475 V
DVI output voltage swing 400~600 mVpp
ESD (HBM) 4,000 V
Composite 1.25 Vpp (when load - 75 Ohm)
S-Video 1.18 Vpp (when load - 75 Ohm)
SDI Serial output data rate (max) 1.485 Gbps
SDI Serial output voltage swing (max) 880 mVpp
SDI Output impedance 75 Ohm, single ended
Image processing
Compression types MPEG-1 320 x 240 MPEG-2 704 x 544
MPEG-1 320 x 240 MPEG-2 704 x 544
Scaling HDTV to D1 for MPEG compression
Host Communication
USB 2.0 Control & compressed audio/video steam
Working speed 480 Mbits/s (SUB 2.0 high-speed)
Data output high voltage 2.4 V
ESD (HBM) 2,000 V
Digital I/O
Hard contact relay outputs 4 NO/NC contacts
Opto-isolated 8 Sets
Ground
Digital GND and analog GND are connected on 2246 board
Four mounting holes are not connected to ground
Power requirements 5 V, 2 A
