Re: [Qutecsound-users] A few issues
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From: Matthew W. <mat...@gm...> - 2009-01-30 20:30:26
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On Fri, Jan 30, 2009 at 1:01 PM, Andres Cabrera <man...@gm...>wrote: > HI Matthew, > > > On Fri, Jan 30, 2009 at 1:53 PM, Matthew Walworth > <mat...@gm...> wrote: > > Have been playing with qutecsound for a couple of days now. Thank you for > a > > wonderful application. It is rapidly becoming my environment of choice. I > > have run across a few issues: > > > > 1. MIDI latency seems quite high. I am trying to play from an external > > keyboard and am getting about 0.5 seconds of delay on each keypress. I've > > tried all the different thread/api options, but they don't seem to make a > > difference. I get little or no latency running the same csd from the > command > > line. Also interesting is that if I use a widget to output information > > about the midi message, the widget seems to update almost instantly on > key > > press/release as does the information written to the console. > > > > Latency is due to the hardware buffer size. In my limited testing, I > found portaudio to be able to handle low latencies. Try setting the -b > buffer to 128 and the -B buffer to 256. This should give you > acceptable latency. Thank you. That has indeed solved my problem. > > What you mention about widgets might be an optical illusion, or might > be due to Csound sending the values to the software bus on every > control period, and since ksmps is much lower than the hardware > latency, the values are displayed faster. > > > 2. The option to "run in terminal" doesn't seem to do anything. I've > checked > > the path to Terminal.app and it is correct. Nothing seems to happen when > I > > try it including that no messages are written to the console. > > > > That's odd... its working here on 10.4. Are you completely sure the > path is: /Applications/Utilities/Terminal.app? > (case sensitive) > Yes, I've double checked the path. I can get Audacity and QuickTime player to open as editor and player respectively, but Terminal is not doing anything. I just did a quick test and substituted the path to Terminal for the path to the player and Terminal does indeed open when I hit the "Ext. Player" button. > > > 3. The option to graph the csd using graphviz has a problem writing its > > output file. I get an error dialog that says, "Cannot create temp dot/png > > file." I'm guessing it is a permissions problem? > > > > I also noticed this. The workaround for now is to put the QuteCsound > application in another directory, e.g. the desktop, the documents > directory, etc. > Thank you. So far this is mostly a curiosity for me. I have used graphviz in the past to dump graphs of data structures from c++ code for debugging purposes. Handy little tool. Thank you for all your help. ...mathom... |