On 09/03/15 04:58, Fons Adriaensen wrote:
On Sun, Mar 08, 2015 at 08:34:42PM +0000, alexus / dotcommon wrote:
(Please excuse if this is a stupid question...)
I am learning Ardour doing some practice on my system (Debian
stable, RT kernel, RT tuning, MAudio Audiophile 2496 PCI, 3GHz 4core
CPU, 8GB RAM, JACK buffer 512). Working with a 3min stereo audio
(24bit, 88.1kHz) I have noticed DSP goes to 100% when exporting
(WAV)...
Is it normal (simply Ardour is using all the available resources
during the export) or something is going wrong (and I will have
glithces/pops in the output file)?
It's perfectly normal. Export puts Jack in 'freewheeling' mode
which means that it doesn't sync to the soundcard but starts
a new cycle as soon as the previous one has ended (the sound
card output gets 'silence' for output meanwhile, and input is
discarded). So things will run 'as fast as possible' which
means CPU load will go up to 100%.
Ciao,
But what if you want to listen to audio from a different application
connected to Jack while exporting? Surely it should just disconnect from
Jack (although this could possible cause routing issues on reconnecting
once finished) and run as fast as possible using max CPU cycles.
Actually I know I have personally exported files after normalising while
listening to different music connected through Jack so your description
seems a little strange to me... Does Ardour export with external sources
(eg jack connected soft synths) so only the internal audio? If the
former then it should always be done real time (maybe the source comes
from the real world, not the digital realm) if the latter then there is
no real to involve Jack, or anything related to the audio interface side
of things at all!
Dale.
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