Encoding hardware and software Streaming media usually starts
Encoding hardware and software Streaming media usually starts with a program recorded on videotape. (I will consider the special case of live streaming in a different chapter.) The output of the VCR is connected to a video and audio capture board that is fitted to the encoding workstation. The board converts the video to a digital format, usually an Audio-Video Interleaved format (AVI). Apart from the video interfacing, the board has several functions that can ease the processing load on the workstation CPU. Video encoding 169 Analog Y/C decompress demod select deinterlace scaling ADC Digital Sources Digital File Digital YUV YUV YUV YUV AVI color format conversion PCI interface These processes can also be performed in software by the main CPU 601 DV decode YUV S-VHS NTSC/PAL Analog Sources Figure 8.6 Video card block diagram.
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