Re: ardour 5.12 crashes, probably MIDI related?

Robin Gareus <[email protected]> Thu, 14 Mar 2019 15:45:56 +0100
Newsgroups	gmane.comp.audio.ardour.user
Message-ID	<[email protected]>
On 3/14/19 2:30 PM, m.eik michalke wrote:

[..]

> disabling and will not be saved
> fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
> fluidsynth: warning: No preset found on channel 0 [bank=0 prog=9]
> fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
> fluidsynth: warning: No preset found on channel 0 [bank=0 prog=17]
> fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0]
> fluidsynth: warning: Ignoring sample Ahh C3 L: too few sample data points
> Speicherzugriffsfehler

We've had similar reports with broken .sf2 files, in particular some
from https://sites.google.com/site/soundfonts4u/ on IRC.

In some cases a work-around was to remove the symlink to the .sf2 in
from the session's externals folder (and re-load the .sf2 later).


> can a SF2 file crash ardour? what else could it be? 

Yes, it may crash the plugin which in turn crashes Ardour.
It seems to have been a memory-corruption in libfluidsynth as follow up
to "too few sample data points".

In any case this issue was likely already fixed in recent fluidsynth-2.0.

> how do i debug this?

Debugging these things is usually hard, there's a chance that you can
catch this directly with gdb, other than that running a debug-build (of
the plugin) in valgrind may point to the issue.

For the case at hand, looking at debug printed messages, and reading
code is probably easiest.

> just for the record, i had the strangest thing happening to me with this 
> particular ardour project, when a few nights ago i stopped the transport from 
> playing: one MIDI channel suddenly began to "play" some pretty weird stuff 
> with what sounded like a chamber orchestra of random instruments. 

Maybe a sf2 virus?!

> it went on 
> for about 15 minutes and then silently came to an end. i grabbed my phone to 
> record it directly from my headphones, as i didn't want to touch any controls 
> and accidently stop the mysterious auto-composition. here's the final 13 
> minutes of "ardour being idle":
>  http://angstalt.de/stuff/ardour/ardour_MIDI_spill.opu
Wow, how avantgarde! I like this one better than those AI trying to use
deep learning to compose :)

Cheers!
robin

_______________________________________________
Ardour-Users mailing list
[email protected]
To unsubscribe  or change your mailing preferences please visit:
http://lists.ardour.org/listinfo.cgi/ardour-users-ardour.org
signature.asc (application/pgp-signature, 833 B)