Panasonic AV-HLC100E Operating Instructions Manual

Contents

Panasonic AV-HLC100E Operating Instructions Manual Manual pdf 88 page image

88For reliable performance, try to ensure the potential upload bandwidth from your system to the net isaround twice the bitrate you choose. You can broadcast at a rate closer to your actual ceiling, but reliableperformance cherishes headroom.Also consider the expected download abilities of your viewers. Ideally, a safety margin 1.5 times thestream’s bitrate is desirable. This may mean you need to consider using a lower resolution, or lowerframerate for your stream – but doing so when required will generally deliver a smooth result, and is thewise course. (Nothing inclines viewers to turn away quicker than a stuttering, start and stop stream. See“Speed Tests” in Section 14.8.1 for some useful resources.)14.7.2 Streaming Media ProvidersUsing a commercial streaming media provider (sometimes referred to as a Content Delivery Network, orsimply ‘CDN’) bypasses otherwise high-bandwidth requirements for the encoding computer. When youhave made arrangements for a streaming media provider to distribute your stream, the encoder onlyneeds enough bandwidth to get a single a/v stream to the provider. All end users connect to the providerto view the stream.Most streaming providers have access to massive bandwidth (and often, with very little notice, they canscale up your allotment to meet a temporary need.) Since your local bandwidth is really only used foruploading a single stream, you can send a high quality stream, secure in the knowledge that it will notdegrade as soon as a second viewer attempts to see it.Other FactorsOther variables to keep in mind when you’re creating video for the web are contrast and motion. Duringvideo encoding for web distribution, a fair amount of video information and detail can be lost. For thisreason, good lighting of your source video is essential.Also, web streaming doesn’t handle detail, transitions and motion all that well -- so your best shots shouldbe close up, and without a lot of movement. Too, audio from cameras and camcorders is rarely as goodas that from external microphones. You should at least use a clip-on lavaliere microphone, if not adirectional or shotgun microphone to be sure you record only the audio you really want.