On Tue, Jul 08, 2014 at 05:01:15PM +0200, cedric.dewijs@xxxxxxxxxx wrote:
OK, I see. I would prefer an all-in-one solution (HDMI output, DVB-T
input, Ethernet and hard disk in a single device). This would seem to
be doable with an ARM board that supports SATA devices. On the RPi I
would not expect it to work, due to everything sharing the single USB
bus.
I am also building an all in one box based on the olinux allwinner A20
board. I have everything working (DVB-T, digitenne decoding, SATA, HDMI
playback). I have connected 3 DVB-T receivers via a hub on one USB
port, and the board happily recorded 3 shows, one per receiver.
I wonder if the recently announced Raspberry Pi Model B+ would work as
an all-in-one solution. While the hardware is almost identical (same
SoC, same amount of RAM), the USB side got improved a little. It looks
like it now got an integrated 4-port USB hub that can supply enough
power for a 2.5" hard disk and a DVB-T tuner, provided that you use a
strong enough power supply. This would eliminate one box (powered USB
hub) from the setup.
Other changes between the Raspberry Pi Model B and B+ are that the GPIO
connector got extended, the circuit board grew a little, and the analog
AV output was removed). The changed circuit board dimensions will
probably mean that it will take a while until cases become available.
And you would still need at least 2 cases: one for the Raspberry and
another for the USB hard disk.
But, the question remains if it is possible to record something and
watch something else at the same time, or if the single USB bus of the
Raspberry gets congested too easily?
I am still struggling howto get accelerated video playback going. Now
the A20 uses 70% CPU to playback a SD stream. I will look into using
the android driver with a linux wrapper around it. It should be doable,
somebody on this list reported success (but I didn't ask him for a
howto)
Good luck. Do you have a case for the A20 where you can install a SATA
disk?
The board can be clocked from 90MHz .. 1GHz. I have yet to measure the
power consumption, but the chip gets quite hot (about 80 degrees) when
running at 1GHz continuously without heat sink.
Have you considered glueing a small heat sink on the chip? Is there any
metal case for the A20 board that would act as a heat sink for the SoC?
I guess that this would already improve things, even if you do not
install a fan.
Marko
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