Sensoray 2253 Windows - Manual (Page 9)

Basic operation
Video Capture Driver
A 2253 device has 2 available streams. That allows a multitude of possible
applications, like using an uncompressed stream for preview while recording
the compressed stream. Another option is recording two streams with different
resolutions and bitrates: a high quality stream for archiving, and a lower
quality stream for low bandwidth streaming. Each stream shows up as a
separate device in Windows Device Manager: Sensoray 2253 Multi-Codec
Device (A) and Sensoray 2253 Multi-Codec Device (B). The DirectShow
capture names for the streams are “Sensoray 2253 Capture A” and “Sensoray
2253 Capture B”. If multiple 2253 devices are plugged in, then multiple
devices will be present.
The two AVStream devices can be used with applications that support the
DirectShow API or the Sensoray SDK. The Sensoray SDK is simply a wrapper
around the DirectShow API to facilitate operation without knowledge of
DirectShow programming. The DLL wrapper also allows easy porting to Visual
Basic, C# and other programming environments. Video can be captured using
uncompressed YUV422 (packed YUYV or UYVY) or YUV420SP (NV12
semi-planar, Y plane and interleaved CrCb plane), or encoded in compressed
formats JPEG, MPEG4 or H.264 elementary streams. Both capture devices
record video from a single source, and each capture device can be started,
stopped, and configured independently. Some options cannot be configured
independently, such as deinterlacing, brightness, hue, contrast, saturation.
GPIO Driver
GPIO support will be offered in later revisions of the SDK.
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