[Csnd] Strange issue with wavfile rendering
| Date | 2019-01-27 23:44 |
| From | Aaron Krister Johnson |
| Subject | [Csnd] Strange issue with wavfile rendering |
Hi all,
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It appears that when rendering audio with "live MIDI" incoming, wave files become gigantic (Something like 60 times what you would expect for 44100/16-bit/2-chan, for example) Obviously, using `fout` is desired anyway in these situations, b/c it is best to hear what is happening, but in case one wants to render a MIDI file offline but in real-time, the wave files are incorrect. To reproduce, try using `-M hw:1,1` or something similar on Linux, while not using `-o test.wav`, and then check how large test.wav gets after a few seconds. Incidentally, my use case for not using `-F` for a rendered MIDI file that Csound controls directly, is that Csound does't allow for tempo scaling an entire MIDI file (e.g. everything 33% as fast as normal for the use by an instrumentalist to practice with a guidetrack) Any thoughts? Best, AKJ |
| Date | 2019-01-28 01:14 |
| From | thorin kerr |
| Subject | Re: [Csnd] Strange issue with wavfile rendering |
Sounds like it's trying to render your score (which might be empty, and goes forever?) to test.wav as fast as possible. Hence, a huge empty test.wav It's a bit of a hack, but to force Csound to run 'realtime', you could try using -iadc (realtime audio in). I think that'll grab the audio device and run things at the pace you're expecting. Thorin On Mon, 28 Jan. 2019, 9:44 am Aaron Krister Johnson <akjmicro@gmail.com wrote:
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| Date | 2019-01-28 08:11 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] Strange issue with wavfile rendering |
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yes, because if you don't use the soundcard, there is no realtime clock and the code runs as fast as the computer can process.
Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy
Maynooth University
Ireland
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| Date | 2019-01-28 13:07 |
| From | Aaron Krister Johnson |
| Subject | Re: [Csnd] Strange issue with wavfile rendering |
That seems like a bug, though, as it is not a "feature", esp. since `fout` works fine and obeys specified format directives... :) Thank for the insights, though, much appreciated, and I will try the `-idac` option after work. Cheers, AKJ On Mon, Jan 28, 2019, 02:11 Victor Lazzarini <Victor.Lazzarini@mu.ie> wrote:
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