26 Sep
2008
26 Sep
'08
10:09 a.m.
porl sheean wrote:
thanks for the reply Pieter.
after sending you the message i realised how stupid i waws regarding
jack. i was thinking that the latency had to be low so that the live
output wouldn't be too delayed, but completely forgot the whole point
of the 'input mix' part :P
you are of course right - i can set a high buffer in jack for any
recording and to just have the device streaming, but the input mix
should still be virtually 0 latency. i need someone to smack me in the
head :)
on a side note, i have in the past had trouble getting the input mix
to output anything (i could only get outputs from the pc channels, not
input mix), but i don't have the ability to test it right now so i
will assume i was just doing something else silly.
The input mix support for the pro26 might be broken, I still have to
look into that. Might take some time, might also be fixed fairly soon.
Can you please try the current branches/libffado-2.0 version to see what
part of the mixer works and what doesn't?
porl
ps. what does the 'mixing/tracking' toggle do? i couldn't notice any
difference last time i checked.
To be honest: I don't know. It's a control that is present because it's
also present in the win/mac mixer, but I haven't figured out what
exactly it does. AFAIK it has something to do with the standalone
operation of the device. It should be in the manual Focusrite provides.
Greets,
Pieter
pps. looking forward to getting a chance to test the new low latency
of ffado! :)
2008/9/25 Pieter Palmers <pieterp(a)joow.be>be>:
porl sheean wrote:
a while ago i purchased a focusrite saffire pro
26io. it has finally
come to a point where it is quite reliably useful as an interface for
jack/ardour (the latency isn't brilliant, but i'm pretty sure that is
the fault of my firewire chipset).
I fixed latency for ffado yesterday, and at
least one person reports 3x32 as
working for him. So if you have a good firewire chipset, you will also be
able to achieve this. But maybe wait for beta7.
i found out recently that unfortunately, in order
to get teh device
working as a basic 'summing mixer' for live work (i wanted to
essentially use it as a basic 8 in 1 out preamp to send to a small
desk at a venue) it needs to be set in 'streaming mode'. i can get
this working by starting jack and just leaving that running, but i was
wondering if anyone knew of an easier way (maybe one of ffado's
command line utilities? there seem to be a lot in there and i don't
know what half of them do). if not, would it be difficult to write a
small app that basically just 'turns on streaming'? or should i just
keep using jack? (i am hesitant to do this as i have still had a few
issues with dropouts, and as you can imagine at a live performance
this could be a problem).
The fact that streaming has to be turned on is a design
decision of
Focusrite. We can't change that.
I don't see why you wouldn't use jack. What's the point in using a separate
application that basically does the same? Just run jack with a large period
size, and you should be fine. Something along the lines of:
jackd -R -d firewire -p2048 -n4
should work fine. I've done multi-hour recordings with the pro26 at 3x1024
without any problem whatsoever.
Greets,
Pieter
PS: Most of the command line tools in the ffado repository are test or debug
tools.