Curious slow audio fade-in with certain USB audio card ... SDL-related?

[alcinos]

Hi,

Does the playback volume varies in time besides this fade-in on restarts ?
For example, if you speak normally, then very quietly (or very loudly), and
then normally again, is the volume equivalent for both periods when you
speak normally ?

2017-09-06 21:28 GMT+02:00 Harald Albrecht <harald.albrecht at gmx.net>:

> Hi,
>
> here's a difficult question, I couldn't solve so far despite extensive
> research. Maybe someone here from devs/users can help?
>
> Some weeks ago I got myself a Steinberg UR22mkII USB audio mic
> preamp+playback for recording voice overs. So far, I were using a more
> bulky Behringer 12chan USB audio mixwr with mic preamps.
>
> I'm noticing a strange audio behavior when using the UR22mkII in Kdenlive,
> which I don't see in Audacity: whenever stopping playing the project
> timeline, and then a few seconds later restarting it, there's a 1s-2s
> clearly audible audio fade in. This doesn't happen with the Behringer. This
> fade in basically makes editing and arranging audio clips impossible. For
> reference, when I'm using the Steinberg UR22mkII with my Android tablet to
> record audio, there's no such unwanted audio fade-in, and playback
> immediately is at the correct level.
>
> Could the unwanted fade be related to how MLT/Kdenluve use SDL?
>
> Yes, my question may, erm, sound strange. But after checking drivers,
> aufio setup, et cetera, this is the best educated guess I can make at the
> moment. Maybe the devs can, erm, chime in?
>
> Best regards,
> Harald
>
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