Schermvoorbeelden. [This post is based on a lecture given by Ariel David and I on the effects of IP networks on visual quality in video over IP applications] One of the biggest obstacles of the video conferencing industry has long been the user experience. Early video conferencing systems suffered from poor quality video and low fidelity audio, as well as great difficulties in establishing and maintaining connection for the conference duration. Most of these issues were solved with advances in processor speed, audio and video coding algorithms and network infrastructure improvement. But even today’s video conferencing experience – with high definition video, wide-band audio and always-on networks – is not flawless, and the main Achilles heel is, as always, the network .
The Achilles heel of High Definition – available bandwidth This is true for video over IP in general – IPTV , video streaming , web casting , you name it. Talking heads Insufficient bandwidth The Seven Deadly Sins 1. 2. 3. 4. 5. 6. 7. Ask the EXPERT: Reasons for Packet LossVideo Over Enterprise. A recent post to the Megaconference mailing list raised an issue, which I have encountered numerous times throughout my years in the video-over-IP business: “Does anyone know why a video conferencing endpoint has packet loss, and even connection break? Are there any network parameters which can cause this?” As this is a frequently asked question, I decided to dedicate a post to this issue, so here’s another edition of “ Ask the EXPERT “, featuring all you want to know about the reasons for packet loss.
In Short When you are sending media – audio and/or video – over an IP network, what you are actually transmitting are packets. Sometimes, for various reasons, some of these packets are not received on the other side. This is known as packet loss. Packet loss is a pain. If packet loss is an issue, I would start with testing the usual suspects (see below). And, yes – if all else fails, call someone from IT. The Long Answer Packet loss is one of the fierce enemies of video conferencing. So RTFM . VCC - Kompetenzzentrum für Videokonferenzdienste: Testnummern. E.164 /ISDN nummers NL. In deze verklarende woordenlijst vindt u uitleg over gebruikte termen. De termen zijn alfabetisch gerangschikt. DNS-service providerEen DNS-service provider beheert de name servers voor de ENUM DNS zones waarin de NAPTR-records zijn opgenomen.
Deze rol heeft een directe relatie met de registrant en registrar. De registrant besteedt het technische beheer van zijn ENUM-zone vaak uit aan een DNS-service provider. De registrar heeft de rol om bij registratie te controleren of de DNS-service provider voldoet aan de technische eisen. Vaak zijn registrar en DNS-service provider dezelfde partij, soms zijn registrant en DNS-service provider een en dezelfde, maar ook drie afzonderlijke partijen komen voor.terug naar boven ENUMElectronic Numbering, overkoepelende naam voor ENUM-toepassingen. terug naar boven ENUM NLDe registry die de Nederlandse ENUM-zone beheert. terug naar boven E.164.arpaHet top level domain (TLD) .arpa, dat volgt op het omgekeerde telefoonnummer.
Das Videokonferenz-Portal - Forumliste - Videokonferenz.com Forum. Videokonferenz & Telepresence | Videokonferenz-News.de. VCC - Kompetenzzentrum für Videokonferenzdienste: Kompatibilitäts-Matrix. Low resolution when calling from a Polycom MDX to an MCU 4200 Series. Why do I receive low resolutions when calling from a Polycom HDX to a Cisco TelePresence MCU 4200 Series? To get a Cisco TelePresence MCU 4200 Series to send w720p to a Polycom HDX endpoint, do the following: On the Cisco TelePresence MCU go to . For Maximum video size select Receive MAX, transmit MAX. For Motion/sharpness tradeoff select Favor sharpness.
For Transmitted video resolutions select Allow all resolutions or 16:9 resolutions only. Notes:The MCU 4200 Series will only send w720p to the HDX if there is sufficient information on the screen for it to be worthwhile. The resolution sent from the HDX to the MCU is determined by the HDX and is not within Cisco TelePresence's control. Note that the HDX9001 will not run at more than w480p with current HDX software: you will need a HDX9002 or higher to get w720p While all details are correct at time of writing, using HDX version 1.0.2, behavior of third party equipment may change in subsequent software releases. What you really need to know about Video Conferencing Systems. Polycom Community - Forums and Blogs. Support. LifeSize® Support Forum. Telepresence Forum | Free Telepresence Discussion Forum. Telepresence | Telepresence Today, News Articles Information. Video conferencing / Telepresence Forum.