There are tools and developing standards to help you assess video quality. The IETF MDI (Media Delivery Index) is promoted by Agilent Technologies, IneoQuest Technologies and others, while Telchemy is betting on its proprietary VQmon. But when it comes to monitoring the quality of streamed video, you're probably on your own: Most tools can't look inside HTTP to see the video stream because major vendors, including Microsoft and Adobe, keep their formats proprietary.
When video is streamed over HTTP/TCP, TCP sequence numbers indicate when a frame has been dropped. Eventually, it will be retransmitted. If it arrives in time, there will be no deterioration of video output. Added delay will likely be compensated for by the play-out buffer.
Got Bandwidth?
A form of convergence is taking place in video encoding and transport technologies. This is to be expected--manufacturers often use proprietary implementations and then evolve to standards-based platforms. For example, Microsoft's VC-1 produces a bitstream that can be transported over RTP. It's been specified in RFC 4425 and SMPTE (Society of Motion Picture and Television Engineers) 421M. Likewise, Adobe's Macromedia Flash now supports H.263, another transport standard.
Broadcast video delivered in an SPTS (single-program transport stream) using an MPEG-2 encoder will require about 2 Mbps to 5 Mbps bandwidth capacity per stream. There's generally 5 percent to 20 percent overhead in the control and packet headers. Several manufacturers, including Tut Systems, have demonstrated HDTV encoders that produce an encoded stream in 6 Mbps or slightly less. However, with additional control and packet headers, your network would need to support about 8 Mbps if the single-program stream of a corporate TV studio or the output of a security camera is sent over the network.
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