de-facto standard for computer audio and video files.
de-facto standard for computer audio and video files. From this point on, regular desktop computer technology now can be used for downstream processing. The AVI files themselves cannot be delivered over the Internet for two reasons: one, AVI files are usually very large, each second of video can be more than 1 Mbyte of data; two, AVI files can t be streamed in real-time over the Internet. You must download the entire file to a local drive before you can play it. Hence the need for compression and packetization. Once captured, the AVI file is routed to the encoding software. The encoder uses a software codec to convert it to a streaming format (typically MPEG-4, Windows Media, Real, or Apple QuickTime). Finally, the streaming file is uploaded to a server for delivery over the Internet. If you are making a live webcast, this process has to take place in real-time. The computer will need a minimum level of processing power; this varies from codec to codec. Codec Codec is short for compression/decompression. Codecs are software programs that employ a mathematical algorithm to squeeze the media files into a more Video encoding 157 270 Mbit/s uncompressed 4 Mbit/s MPEG-2, SD-TV 1.5 Mbit/s MPEG-1 500 kbit/s ADSL, cable modem 56 kbit/s analog modem Figure 8.1 Relative file sizes.
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