IEEE Consumer Electronics Magazine - September/October 2022 - 36

Video Technology
Figure 4. Detail of the electric current consumed
by the idle Raspberry Pi.
Power and energy consumption were calculated
for each device using the voltage and current
measurements. Figure 5 shows the average
power absorbed while each encoding algorithm
was running (in Watts), and Figure 6 shows the
average energy consumed per frame while
using each encoder, depending on the frame
resolution in megapixels (MP). When encoding
sequences with a frame size above 1MP using
omxh264enc, the device runs out of memory or
is unable to perform in real time due to the large
frame size (class A & B).
The power consumption of each algorithm
was calculated by averaging the instantaneous
power consumed, which is equal to the current
absorbed times the voltage across the
terminals, and then those values were averaged
as shown in (1). The energy consumption
per file was calculated by numerically
integrating the instantaneous power, which
has previously been calculated, using the
amount of time between measurements as
timestep. This is represented by the summation
shown in (2)
Palgorithm ¼
PNmeasurements
1
Efile ¼
tXfinal
i¼tinitial
As can be seen from the results, a significant difference
exists between the encoders with
regards to their energy consumption, although
all the encoders' power consumption is within
36
ViIi
Nmeasurements
ViIi Dt:
(1)
(2)
Figure 5. Power consumed by the devices
according to the encoder and embedded system.
the same order of magnitude, with the hardwarebased
encoders and the Raspberry Pi board
being more efficient. However, each encoder's
energy consumption is vastly unequal, with
rav1e, both on the Raspberry Pi and Jetson
Figure 6. Energy consumed by the devices
according to the encoder and embedded system.
IEEE Consumer Electronics Magazine

IEEE Consumer Electronics Magazine - September/October 2022

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