linuxaudio.org

On 06/01/2011 04:29 PM, Fons Adriaensen wrote:

quoted text
> On Mon, May 30, 2011 at 10:28:14AM +0200, Jörn Nettingsmeier wrote:

>> On 05/28/2011 01:37 AM, Jörn Nettingsmeier wrote:

>>> On 05/27/2011 10:08 PM, Fons Adriaensen wrote:

>>

>>>> I've got a strange problem with MFV. *Something* is poisoning

>>>> the signal graph with Nans or Infs. One visible result is that

>>>> e.g. the W channel of one of the jkmeters shows only peaks and

>>>> no RMS values (this is to be expected if the filter state gets

>>>> a Nan - once a Nan always a Nan). The other indication is that

>>>> adding an Ambdec produces a never ending xrun storm even if the

>>>> effective CPU load remains below 10%.

>>>>

>>>> Have you seen anything similar ?

>>>

>>> not in this session. sc4 can be funny at times, but i haven't had any

>>> issues with it for quite a while. i don't have access to the session

>>> atm, will ake a look when i return home on sunday. meanwhile, if you

>>> want to pinpoint the problem, try muting all channels and then unmute

>>> one by one.

>>>

>>> do the nans crop up immediately, or only after playing some audio?

>>

>> i just tested the session again, and i don't see any NaNs or INFs. what

>> i did notice, though, is that i'm burning a ridiculous amount of cpu for

>> this tiny little arrangement - i had tried with 64 frames initially, and

>> it maxes out immediately (on an 2.6 ghz i5 quad-core). safe way to run

>> it is at -p 1024 -n2.

>

> Turned out to be jconvolver. Added some Nan testing code to zita-convolver

> and the problem disappeared, also without the extra code. Could be I

> accidentally installed a version compiled on another machine. But then

> it's a miracle non of this showed up earlier...

funny. never seen that.
> Nice recording BTW. The flugelhorn solo triggered happy memories of

quoted text
> recording the BRTN jazz orchestra - we had an marvellous trumpet /

> flugerhorn player then, Bert Joris.

thanks. yeah, flügelhorn is really like a hello kitty pillowcase for the

soul ;-P

it's to the trumpet what the double-bass is to the electric bass guitar

- the restrained, subtle version. you can't noodle around easily, you

have to mean it (says an electric bass player).
cheers,
jörn
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