need speed

Help for Audacity 2.x.x on GNU/Linux.

ImageThis forum is for Audacity 2.x.x on GNU/Linux and Unix-like operating systems.
Please state which version of Linux you are using, the exact three-section version number of Audacity from Help > About Audacity... and whether you installed your distribution's release or daily version of Audacity or compiled Audacity from source code.

Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.

need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 5:31 pm

Audacity 2.1.2 and Xubuntu 16.04 64 bit. I need to record 18 channels of music via USB cable from a mixer. I have a 1TB spinning drive running the program and a 120G SSD to record it onto. I went into Preferences and chose the SSD drive for the temp file. Is this correct? Is this the fastest means of recording to make sure that I don't have to drop the quality? My issue has always been trying to get enough throughput to the HD.

I had actually gone backwards before to Xubuntu 14.04 and an older version of Audacity because it worked where the new version did not. But lately, I can no longer edit the recordings made on the older Audacity version on the new version: when I try to play something, it skips ahead about 20 seconds before actually playing.

Thanks in advance.
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Re: need speed

Permanent link to this post Posted by Trebor » Tue Jul 04, 2017 7:22 pm

autodctr wrote:need speed

Set the CPU frequency (clock speed) governor to "performance".
Give Audacity higher CPU priority (less nice).
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Re: need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 8:07 pm

Actually, CPU time is not the issue. When I am recording, the CPU is running at about 10 %, memory usage is around 880 meg, and 0 swap. I am running a 3.3 quad core.

What I noticed: with the older Audacity 2.0.?, when I finally stop the recording after about 15-20 minutes of recording, the HD runs crazily for about a minute before I am able to save the file. With the newer version of Audacity, I can save the file instantly. What I am supposing here is that the old version was "stringing" everything together AFTER the recording was stopped whereas the newer version does the stringing while recording. Therefore, I am assuming that this is where the problem lies: the HD is not fast enough to lay down all that info. So, that is why I have put an SSD drive into the machine. I do not yet know whether that is going to do the trick or not. I was just trying to understand exactly how and where Audacity buffers to and records to.

Right now, I have the spinning HD running the program and the SSD recording the soundtrack. I could have the program run and record from the SSD if someone tells me that is a better way. But again, the writing of the soundtrack is where *I* believe the bottleneck occurs.
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Re: need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 8:19 pm

This is an older post about this problem: viewtopic.php?f=48&t=91897&p=307807&hilit=autodctr#p307807. If the sound clips are still there, you can hear what I was getting while recording: and that was with the recording quality settings brought down quite a bit with really no difference from what Audacity used as default when installed.
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Re: need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 8:20 pm

One last thing: a 15 minute recording (on the older version) @ 18 channels, comes out to about a 6 gig file.
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Re: need speed

Permanent link to this post Posted by Trebor » Tue Jul 04, 2017 9:24 pm

autodctr wrote:One last thing: a 15 minute recording (on the older version) @ 18 channels, comes out to about a 6 gig file.

I'm awestruck that you can get Audacity to record 18 channels.

Within an Audacity-project the audio is stored at 32-bit-depth, (no matter the bit-depth of the capture).
18 mono channels at 44100Hz 32bit is ~80Mb per minute, for 15 minutes is 2700Mb = 2.7Gb

Maybe you're recording at higher-rate than the standard 44.1kHz,
96kHz sample rate would give 5.88Gb for 15 minutes, that's close to your "6 gig".
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Re: need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 10:46 pm

18 stereo channels, hence the 6G size. Or there abouts.

Anyway, I am still trying to find out what the best set-up is for attempting it, if someone has any ideas.

I did it before with the older version. Now, I have better PC, better HD (SSD), and I am hoping to accomplish this. The SSD is hooked to a 6G SATA port. I just have no other ideas other than trying to find out exactly where Audacity buffers/records the info.

I have the program on the spinner HD, the temp directory for Audacity on the SSD. I am hoping that this is the correct/best option.
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Re: need speed

Permanent link to this post Posted by autodctr » Tue Jul 04, 2017 10:49 pm

Recording was at 44.1 with 32 bit float. What else can I tweak if I need to? I am hoping not to drop below 44.1 one for several reasons: I want the quality and even when I tried that before it really didn't help.
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Re: need speed

Permanent link to this post Posted by autodctr » Sun Jul 09, 2017 3:20 pm

No joy today. Even with the SSD, I still could not record 18 channels even after dropping the to frequency to 22.1 and using the lowest sampling rates.
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Re: need speed

Permanent link to this post Posted by steve » Sun Jul 09, 2017 4:51 pm

Have you tried using Jack Audio System?
http://jackaudio.org/
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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