  We present a straightforward, non-intrusive adaptive bit rate streaming
segment quality selection policy which aims at extending battery lifetime
during playback while limiting the impact on the user's quality of experience,
thus benefiting consumers of video streaming services. This policy relies on
the relationship between the available channel bandwidth and the bit rate of
the representations in the quality ladder. It results from the characterization
of the energy consumed by smartphones when running adaptive streaming client
applications for different network connections (Wifi, 4G, and 5G) and the
modeling of the energy consumed as a function of said relationship. Results
show that a significant amount of energy can be saved (10 to 30%) by slightly
modifying the default policy at the expense of a controlled reduction of video
quality.
