dashdemux: allow control of minimum and starting bitrates

Submitted by A Ashley

Description

dashdemux will start with the Representation that has the lowest bitrate. In some cases, this is not the most optimal thing to do. For example the lowest bitrates might only be intended for devices such as mobile phones when the network bandwidth can be very limited and the screen size is relatively small. Under normal conditions, these bitrates are not really suitable for use on a TV or a laptop.

There are already properties that can be set to limit the maximum bitrate and maximum video resolution. It would be useful to have a property that could be used to control the minimum bitrate and the starting bitrate.