Re: [fluid-dev] Trouble building/using fluidsynth

[Justin]

Thanks, great advice! I'm definitely getting further, but still facing issues.

I created a new virtual ec2 instance locally on my mac, and installed all the dependencies with yum, not LinuxBrew (dependencies needed were libsndfile-devel and glib2-devel). I've generated a fluidsynth binary and I'm able to actually convert midi to wav on my local ec2 instance with the binary. 

After copying all the libraries I needed over to my lambda (there were a lot of sub-dependencies needed, like libFLAC.so.8, libgsm.so.1, etc and I kept adding more when it would crash looking for them), I tried it out. The execution completes, but no wav file is actually generated. Here's the output of the call to fluidsynth_exec/fluidsynth -ni tmp_sf2_file_name tmp_mid_file_name -F tmp_wav_file_name -r 44100:

fluidsynth: error: Device </dev/dsp> does not exists

Failed to create the audio driver

FluidSynth runtime version 2.0.2

Copyright (C) 2000-2018 Peter Hanappe and others.

Distributed under the LGPL license.

SoundFont(R) is a registered trademark of E-mu Systems, Inc.

Uploading wav to S3

[INFO] 2018-12-29T02:28:31.717Z 6e32994f-0b11-11e9-9ca9-83cd32eff3db In CatchAllExceptionHandler

[ERROR] 2018-12-29T02:28:31.717Z 6e32994f-0b11-11e9-9ca9-83cd32eff3db [Errno 2] No such file or directory: '/tmp/some_wav.wav'

Do you know what might be going wrong now? I'm unsure what goes into making sure the audio driver works. I'm actually surprised that it's working on my local ec2 instance, since I did no configuring of the audio driver there.
Thanks so much!
Justin

On Thu, Dec 27, 2018 at 8:41 AM Marcus Weseloh <address@hidden> wrote:

Hi Justin,

Am Di., 25. Dez. 2018 um 02:36 Uhr schrieb Justin <address@hidden>:

Cool, thanks! I've now set up a virtual EC2 instance locally on my mac, and complied fluidsynth, as you've suggested. I'm still having execution issues, though when I try to call the subprocess to run fluidsynth on the lambda as a subprocess of my python lambda function:

I have no experience with linuxbrew, but it is obviously compiling stuff with it's own lib path. So you need to copy the whole /home/linuxbrew/.linuxbrew/lib/ folder to your AWS instance (under the exact same filepath). Or you could try to make it find the correct libraries via LD_PRELOAD and LD_LIBRARY_PATH env variables.

But maybe it would be better (and easier!) to simply ditch linuxbrew and use standard linux techniques and infrastructure to build fluidsynth and it's dependencies. And you probably don't even have to build all dependencies. I'm sure even the Amazon Linux has some sort of package manager. (Just checked: "yum" should be available). So "yum install gcc make cmake libglib-devel libasound-devel" should give you a working devel environment. Package names might differ, so check with "yum info" or search with "yum seach". Then simply clone the fluidsynth git repo and build it.

Cheers,

   Marcus 

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