The functions of the card include the following:
The functions of the card include the following: Decoding composite analog NTSC and PAL into a YUV format Demodulating the color component of S-video to U/V Analog-to-digital conversion Decoding DV (IEEE-1394) to uncompressed YUV Color pixel format conversion to an AVI format Interfacing to the PCI bus The cards usually have a number of other facilities; these vary with different models and their manufacturers: Spatial scaling De-interlace filter VCR control port Video preview output The video preview facility may use Microsoft Direct Draw for DMA (direct memory access) to the workstation video driver. This saves loading the CPU, because a real-time preview at 30 fps would take considerable processor resources. To achieve optimal system performance it may be necessary to use a computer with fast or multiple processors, especially for live events. The performance of the disk drives should not be forgotten. For archiving or file conversion, use a high-performance disk drive, for example a 10,000-rpm SCSI. This can help to offload performance requirements from the main CPU, freeing up more processing power for the encoder. Encoding sessions From the previous description of encoding and compression, it is clear that there are a huge number of possible parameter sets for encoding. It would not be productive to set up all these parameters from scratch for each encoding session. Instead, templates or profiles can be set up to suit typical content. Most codecs come with a number or profiles already prepared. For example, a template might be stored to encode a Beta SP tape to MPEG-4/AVC for delivery over a corporate network at 500 kbit/s. Encoding enhancements Multiple bit-rate encoding Early deployments of streaming media often posted links to the media file at perhaps three different rates: 30, 100, and 300 kbit/s. So the onus was on the 170 The Technology of Video and Audio Streaming
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