Stretch markers: Sloped shape causes doubling and "flams" (BIG bug with no workaround

juliansader · 03-10-2018, 03:56 PM

When using stretch markers with sloped shapes, the audio immediately to the right of a sloped section gets doubled during playback and render.

The bug is easy to see if the stretch marker falls just before a large transient:

If the stretch marker shape is flat, playback and render is correct:

(The rendered section is below.)

But when the shape is sloped, even if the end rate is the same as in the previous example, the transient is "flammed":

Stretch marker fade size does not appear to have any effect on the bug.

juliansader · 03-17-2018, 03:17 PM

No demo project is required, since this will happen with any sloped ritardando stretch marker.

Here is a demonstration of sloped accelerando vs sloped ritardando vs flat. Each is shown in two takes: the first take shows the stretch marker, and the second the rendered audio. The rendered ritardando is highlighted. Accelerando and flat remain perfectly aligned, whereas ritardando causes flamming:

hscottaudio · 03-23-2018, 08:53 AM

*bump*

This is a feature crippling issue.

Justin · 03-26-2018, 03:22 PM

Edit: I think I might know why this is now, working on a fix.

Justin · 03-26-2018, 07:52 PM

Try 5.79pre2+ in the pre-release forum, thanks!

hscottaudio · 03-27-2018, 01:46 AM

Quote:

Originally Posted by Justin

Try 5.79pre2+ in the pre-release forum, thanks!

Thanks, Justin.

Whilst you're looking at this, any chance you could glance over this request? Not sure if it's feasible, but would be cool to have (Nuendo has an offline version of this)..

https://forum.cockos.com/showthread....44#post1970144

03-17-2018, 03:17 PM	#2
juliansader Human being with feelings Join Date: Jul 2009 Posts: 3,714	No demo project is required, since this will happen with any sloped ritardando stretch marker. Here is a demonstration of sloped accelerando vs sloped ritardando vs flat. Each is shown in two takes: the first take shows the stretch marker, and the second the rendered audio. The rendered ritardando is highlighted. Accelerando and flat remain perfectly aligned, whereas ritardando causes flamming: __________________ Scripts for advanced MIDI editing \| LFO Tool for MIDI editor and envelopes Video thumbnail scripts \| ReaScriptAPI extension

03-26-2018, 03:22 PM	#4
Justin Administrator Join Date: Jan 2005 Location: NYC Posts: 16,117	Edit: I think I might know why this is now, working on a fix. Last edited by Justin; 03-26-2018 at 04:16 PM.

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03-23-2018, 08:53 AM	#3
hscottaudio Human being with feelings Join Date: Jul 2016 Posts: 100	bump This is a feature crippling issue.

03-26-2018, 07:52 PM	#5
Justin Administrator Join Date: Jan 2005 Location: NYC Posts: 16,117	Try 5.79pre2+ in the pre-release forum, thanks!