On Sun, 15 Jun 2014, Ralf Mardorf wrote:
On Sat, 2014-06-14 at 13:43 -0700, Len Ovens wrote:
The user will have to learn what the lowest latency is that they
can use for a certain task without xruns. We can't do that. I would
like to have an "About Latency" button for this reason.
That's a good idea. Btw. it might be important not only to educate
people how to use -p and -n options and that the lowest latency depends
to the load, but also to mention that it's possible to change the
latency during production, likely not on the fly, but it anyway is
possible and could be helpful, but that this could cause issues when
using some apps. At least last time I used Qtractor, the anyway not good
Yes latency can be changed on the fly... that is jack does not have to be
restarted. However there are audio artifacts at the switch even in
applications that deal correctly with it. For example both ardour and
guitarix will keep working (adour even in the middle of playback) but
there will be a glitch. However, other programs will have to be restarted
such as rakarrack in order to work right on the new latency.
The only plus for changing latency on the fly is that Jack always owns the
audio device. Changing -p is easy. changing -n can not be done on the fly
for jackd only for jackdbus and it still requires a full reload... though
the reload doesn't seem to affect connections (I should check that more
carefully).
latency compensation for audio tracks did only fit to the latency, that
was used for recording and got out of sync, when I changed the latency
during production. Theoretical it would be nice to do some recordings
with low latencies, while many tracks are muted during such a recording,
to produce less load and then when e.g. mixing with a high load, to
increase the latency.
I do this all the time. I record at low latency with effects, eq, etc.
turned off. Then mixdown at higher latency so my computer has the CPU
headroom for effects. This was more of an issue with my old machine (some
12 years old now) than with my newer one, but it still gives me more room
for creativity. This is quite common from what I have heard from other
people. It is one of the things I suggest to people who are asking about
such things.
--
Len Ovens
www.ovenwerks.net
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