USB audio/video codec in 38x70mm footprint
One of the streams can be a low-latency uncompressed stream (useful for real time previewing) and the other compressed, or both streams may be compressed. Image resolution is independently configurable for each stream, as well as compression type and bit rate in the case of compressed streams. Video and audio are available as elementary streams or may be multiplexed in MP4 container format. Up to 1024 bytes of application-supplied data may be inserted in the H.264 or MPEG stream, at a specified frame interval or single shot. The 2253 implements hardware-generated timestamps to keep audio synchronized to the video, thus eliminating "lip sync" problems. Up to 80 characters of overlay text may be positioned anywhere in the video frame prior to compression.
One general purpose digital input and one output are provided. The output is optically isolated, while the input may be either optically isolated or galvanically coupled. The input is sampled every millisecond and, when a state change is detected, a notification is sent to the application program. Overlay images can be displayed on top of the composite video output. The overlaid video may be sourced from either the composite video input or a decoded compressed stream. Image formats supported are Windows bitmap (BMP) and Portable Network Graphics (PNG), with 24 or 32 bits per pixel. Overlays support 7 transparency levels.
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