Carnegie Mellon. Carnegie Mellon Video I Carnegie Mellon Digital Video Size quality Broadcast quality is very different from www MPEG-2 is satellite.

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Presentation transcript:

Carnegie Mellon

Carnegie Mellon Video I

Carnegie Mellon Digital Video Size quality Broadcast quality is very different from www MPEG-2 is satellite dish video MPEG 1 is VCR quality

Carnegie Mellon Transmission Time Size Download speed 14.4k Modem, 56k Modem, ADSL, Cable Modem MPEG-1, 2, RealVideo ==> Time to download a 1 minute clip (1 hour)

Carnegie Mellon Streaming Access disk fast enough RAIDs Don’t download everything first Play as you start to download Keep a buffer for variable network speed equivalent to sampling a CD’s faster and filling a buffer Drop frames when you fall behind (not TCP) Adjust the bandwidth dynamically need multiple encoding formats RTSP, QT, MS ASF, H.323 (video conferencing)

Carnegie Mellon Webcasting LIVE Encode fast enough Stream to multiple users connected at the same time Only time-synchronous viewing

Carnegie Mellon MPEG: Motion Picture Experts Group MPEG-1 (1992) Compression for Storage 1.5Mbps Frame-based Compression MPEG-2 (1994) Digital TV 6.0 Mbps Frame-based Compression MPEG-4 (1998) Multimedia Applications Low bit rate Object based compression

Carnegie Mellon MPEG-1 I,B,P Frames Choice of audio Encoding Picture size, bitrate is variable No closed-captions, etc. Group of Pictures one I frame in every group size B and P are in random within GoP

Carnegie Mellon Video I That’s all for today

Carnegie Mellon