Abstract: A video encoder (2) is disclosed for sending video data to a server (4) over a channel. A video compressor (16) can compress video data using an adjustable compression factor. A multiplexer/pack constructor (18) can receive compressed video from the compressor, together with non-video data, and can queue data for transmission. A bandwidth monitor (20) is provided for monitoring the performance of the channel based on the behaviour of transmitted data packets, including their round-trip travel time to and from the server (4). The compressor (16) can modify the adjustable compression factor based on the performance of the channel, as determined by the bandwidth monitor, and the amount of non-video data received by the packet constructor. This can permit transmission of non-video data without disrupting the live video feed or introducing any delay.

Abstract: A video encoder (2) is disclosed for sending video data to a server (4) over a channel. A video compressor (16) can compress video data using an adjustable compression factor. A multiplexer/pack constructor (18) can receive compressed video from the compressor, together with non-video data, and can queue data for transmission. A bandwidth monitor (20) is provided for monitoring the performance of the channel based on the behaviour of transmitted data packets, including their round-trip travel time to and from the server (4). The compressor (16) can modify the adjustable compression factor based on the performance of the channel, as determined by the bandwidth monitor, and the amount of non-video data received by the packet constructor Specifically, the compression factor can be changed so that video data can be transmitted promptly but with reduced quality if there is less bandwidth available and if space is required in the channel for non-video data.

Abstract: A telescopic device for use in a crane jib, forklift truck, lighting tower, access platform or the like, having at least two extandable sections extending from a base section, in which each said extendable section is extended by a piston and cylinder assembly and in which, to extend the device, a similar hydraulic pressure is applied in the extension mode to all the assemblies and different hydraulic pressures are caused to exist in all the assemblies in the retraction mode, so that a selective extension sequence of the sections is effected.