[bug] Timeline selection becomes distorted with some VST plugins

Petersson wrote on 8/18/2023, 6:19 AM

BUG DESCRIPTION
Ticket nr. 2023081817001725
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This is a very old bug, in the forum it was already present more than ten years ago.

It occurs in all builds, several machines, both NVIDIA / AMD / INTEL drivers, etc.

When you make a selection on the timeline, it become blueish.
This "solid" blue color get several gaps when some VST plugins are active.
The blue color gets "solid" again when your selection "snaps" to a marker or vertical gridline.

See the movie below, that demonstrates this issue.

SOME DETAILS
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Without any plugin active, the selection is very smooth moving and solid blueish.

But once you active a "somewhat" heavier plugin like RX Spectral De-noise (best settings), the selection is sluggish, gets gaps, etc..

Those caps disappear when your selection-boundaries snaps to a gridline and re-reappears when adjusting the active selection again.

It does not happen with all audio plugins (like the native Vegas ones), but with 3rd party plugins, the selection is almost never smooth.

WHICH BUILDS
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I don't know when this issue happend for the first time, but it is at least 10 years active.

In my current build I use Vegas 19 / 20 and (trial) 21 - they all have this exact same bug.

Comments

rraud wrote on 8/18/2023, 9:51 AM

Hi @Petersson, I do not think it is bug. Many of RX processes use lots of a PC's CPU resources. Does the same behavior occur when using Vegas "Render to new track" tool? I am not very familiar with RX Standard or Advanced. I use SpectaLayers Pro in Sound Forge or as a stand-alone app.

RogerS wrote on 8/18/2023, 10:08 AM

This one I wasn't able to replicate though I'm not sure I quite matched the original test. It has the master bus on with envelopes. I tried different ways of viewing time (seconds, measures & beats, film) that didn't seem to make a difference.

In an unquantized audio-only edit it starts to get slow as I zoom in to the sample level.
Okay, with spectral denoise applied on an event and on the master bus I start to see lag as it catches up to the selection (black bars below the Fx window should be drawn in).

Petersson wrote on 8/18/2023, 10:43 AM

@RogerS / @rraud

Thank you for the reply, I will dive deeper in it and report back.

I do think it's a bug, because sometimes it's there, and sometimes not - even with a 3.000 USD videocard.

And software like Audacity / Sound Forge (on the same system) don't show it (with the same footage and plugins active).

"So it must be possible to get rid of it". 🙂 😉

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It is also mentioned earlier by other users (and myself);

It's maybe not quite the same, but if it feels like a bug, acts like a bug and sounds like a bug... it's a bug?

Anyhow, it's annoying (like bugs are) 😂 👍🏽