Need one of these and it occurs that a PI 3 plus SD card, DVB s2 usb dongle, remote mouse and keyboard, case & PSU would actually allow me to drive the HDMI TV port with sound and video,and be happy to access my network media stores via the onboard ethernet.
I'd use Ubuntu MATE to underpin it...kaffiene for choice.. looks like kaffiene is in that distro
anyone have any comments?
I've used various DVB-S/DVB-T cards over the years, some have the tuner/demodulator chips 'direct' on the PCI bus, others 'hide' them behind a PCI->USB bridge, so they're effectively dongles on a card, obviously if it's an actual dongle it must be USB.
The disadvantage I find with both of the USB approaches is that they tend not to have hardware PID filtering, so the CPU has to process the full ~40 Mbps transport stream and filter out the one or two it's interested in viewing/recording in software. So you get high levels of interrupts and context switches, I don't know if a Pi copes well with that or not?
usb
oIf you are doing anything with HD video, I'd stick to Raspbian, as the video acceleration is better than Ubuntu. (Unless things have changed in
the last 12 months).
---druck
Thats ood, since Ubuntu is based on Debian...
...but the hardware-specific code used for video acceleration will be in Raspbian-specific drivers. These may never get back-ported to Debian since they will be quite hardware-specific, i.e. useless on anything not using Broadcom chips that include their GPU
yebbut ubuntu for the pi is still based on debian for the pi.
Sure. If I understand the way these things work, for Ubuntu to use Debian GPU driver it would have to get backported from Raspbian to Debian possible modified to harmonise its calling conventions and documentation with the Debian motherlode before being incorporated into Ubuntu.
Given that Ubuntu seems to go off in its own way which isn't necessarily all that compatible with Debian and/or its direct derivatives it seems likely that the above harmonisation would need to happen before Ubuntu could use the Raspbian driver and/or in the meantime Ubuntu has developed its own drivers for the RPi GPU and either won't use Raspbian code (the Not Made Here syndrome) or their API is sufficiently different from Raspbian that they think the extra performance is not worth the effort needed to make the change.
All of these seems perfectly reasonable reasons for Raspbian and Ubuntu to be using their own GPU drivers.
On 17/12/2017 14:39, The Natural Philosopher wrote: > yebbut ubuntu for the pi is still based on debian for the pi.
Raspbian is based on Debian, and Ubuntu is based on Debian. But not everything in Raspbian is in Debian, and certainly not in Ubuntu.
---druck
Have something to add? Share your thoughts — no account required.
Ask the community — no account required