Could not duplicate the problem in trying 4 different aac files that I downloaded. Tested with Video Driver X11 and also OpenGL. Maybe like Andrew suggested, you could upload to somewhere a small sample aac file that exhibits the issue?

On Fri, Jan 6, 2023 at 12:57 AM Rob Prowel via Cin <cin@lists.cinelerra-gg.org> wrote:

On 1/4/23 12:20, Rob Prowel wrote:
>
>
> at zoomed-in scale the audio timelines randomly drops/shifts the level
> bars in short bursts.
>
> Will attempt to add PNG file that shows this behaviour.
>

FWIW, this has the distinct odor of incorrect signed/unsigned
conversions when applied to the GUI. Remember, there is no single
"standard" for audio sample data. My two commonly used codecs are aac
(final copy), and pcm_s16le (better for NLE), and I can say with a
fleeting certainty that the attached sample was of uncompressed aac.
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