It will go down bandwidth, when the available bandwidth isn't sufficient to
stream the current one.
the myth backend only generates one video stream and one audio stream. So
if the bandwidth isn't sufficient for video, that it falls back to the
audio-only is the proper things to do.
One of the reason it's doing so is that myth marks the stream as "live"
until the whole movie is decoded.... As such, when the bandwidth is too
low, it will switch to audio rather than pause and wait for more data to