Bandwidth Requirements

BARTEC PIXAVI mobile devices are made for mobile video conferencing. The devices support from CIF to 1080p resolution, frame rates from 10 fps to 30 fps and bandwidths from 128 kbit and up to 4 mbps. The available network is often the limiting factor when you are in a video call. To solve this, you can buy a dedicated video conferencing connection which guarantee a certain amount of throughput between two locations, and then use the normal internet connection between the location of the mobile device and the nearest hub. Depending on the resolution and frame rate you want to use, here is the minimum and recommended bandwidth requirements

Resolution Minimum bandwidth Recommended bandwidth
1080p 2 Mbit 4 Mbit
720p 1 Mbit 2 Mbit
480p 512 kbps 1 Mbit
CIF 256 kbps 512 kbps

 

 

modern tablet internet wifi

QoS

To get the best experience, you need a dedicated Wi-Fi SSID with a QoS network. If there are many devices connected to the same Wi-Fi, you will experience packet loss and pixellated images. The video will never be better than the network it is connected to. Signal strength, QoS and number of devices often play a big role. Also, it is often recommended to turn down the bandwidth and the FPS in order to get better experiences.

The values in the table is for one video+audio stream from one device to another, and if the other device also sends video+audio back, then you must double the numbers. It’s also important to distinguish between incoming and outgoing bandwidth, especially when calling into virtual meeting rooms. Often, internet providers have an asymmetrical relationship between the incoming bandwidth and the outgoing bandwidth (e.g. 100Mbit down, 10Mbit up), and this is a bit problematic for video conferences. Incoming bandwidth is the bandwidth consumed when you receive a stream from somewhere on the internet, while outgoing bandwidth is the bandwidth consumed when you transmit a stream to someone on the internet.

 

Video conference in the office

Screen Shot 2016-05-23 at 10.01.11

If you just do local streaming, on the same WiFi network, then bandwidth should generally not be an issue if the WiFi infrastructure is of high enough quality. Low quality WiFi equipment can cause severe packet loss. Also, having multiple mobile devices on the same Wi-Fi streaming video simultaneously could cause packet loss. Ideally, you should only have one mobile video device connected to the Wi-Fi access point to get the best quality audio and video.

Wi-Fi