VSE: keyframed Speed Control strips acting on Scene strips interfere with other keyframed strips #55192

New Issue

Jacob van't Hoog · 2018-05-25T03:15:01+02:00

Jacob van't Hoog commented

2018-05-25 03:15:01 +02:00

System Information
Windows 10

Blender Version
Broken in both 2.79b and 2.80-41cba97

Description

I was using the Video Sequencer to edit an animation. I had a Scene strip, with a Speed Control strip attached to act as a freeze frame -- I keyframed the speed factor so it would jump between 0 and 1 to pause at certain points. And I had some moving image strips overlayed on top of this. I noticed that the movement of the image strips would jump every time the speed changed, even though the speed control strip wasn't connected to them.

Steps to reproduce
Here's a simplified file with the bug:
bug.blend
The text is supposed to move up and down the screen smoothly. But when you play the sequence, the animation jumps in the middle, right when the speed factor of the speed control strip changes. Sometimes the text jumps at other points too.

Steps to reproduce

In the Video Sequencer, add a Scene strip.
Add a Speed Control strip connected to the Scene strip.
On the speed control strip, uncheck "Stretch to input strip length" and check "Use as speed." Change "Multiply Speed" to 1.
Add keyframes to the Speed factor so that it starts at 0, and at some point has a Constant keyframe that jumps to 1
Add a text or image strip on top of the scene/speed strips. Add keyframes it so it moves. When the Speed strip's speed changes, the text/image animation will reset.

The bug still occurs even when I select a different scene than the one with the sequence.

**System Information** Windows 10 **Blender Version** Broken in both 2.79b and 2.80-41cba97 **Description** I was using the Video Sequencer to edit an animation. I had a Scene strip, with a Speed Control strip attached to act as a freeze frame -- I keyframed the speed factor so it would jump between 0 and 1 to pause at certain points. And I had some moving image strips overlayed on top of this. I noticed that the movement of the image strips would jump every time the speed changed, even though the speed control strip wasn't connected to them. **Steps to reproduce** Here's a simplified file with the bug: [bug.blend](https://archive.blender.org/developer/F3450176/bug.blend) The text is supposed to move up and down the screen smoothly. But when you play the sequence, the animation jumps in the middle, right when the speed factor of the speed control strip changes. Sometimes the text jumps at other points too. **Steps to reproduce** - In the Video Sequencer, add a Scene strip. - Add a Speed Control strip connected to the Scene strip. - On the speed control strip, uncheck "Stretch to input strip length" and check "Use as speed." Change "Multiply Speed" to 1. - Add keyframes to the Speed factor so that it starts at 0, and at some point has a Constant keyframe that jumps to 1 - Add a text or image strip on top of the scene/speed strips. Add keyframes it so it moves. When the Speed strip's speed changes, the text/image animation will reset. The bug still occurs even when I select a different scene than the one with the sequence.

Jacob van't Hoog commented

2018-05-25 03:15:01 +02:00

Added subscriber: @vantjac

ChristopherAnderssarian commented

2018-05-28 10:26:41 +02:00

Added subscriber: @ChristopherAnderssarian

Philipp Oeser commented

2018-05-29 11:14:14 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-05-29 11:14:14 +02:00

Confirmed (without further investigation in code so far)

Strangely enough: if you

mute the Speed strip (H) and let the animation run through the timeline once
unmute again (Alt+H)
cant get it to fail after that, everything is fine then

needs further investigation...

Confirmed (without further investigation in code so far) Strangely enough: if you - mute the Speed strip (H) and let the animation run through the timeline once - unmute again (Alt+H) - cant get it to fail after that, everything is fine then needs further investigation...

blender-admin commented

2019-07-08 23:53:40 +02:00

This issue was referenced by a42cae1600

This issue was referenced by a42cae160082afaf5507fa558fbaf5d1d5987f17

Richard Antalik commented

2019-07-09 00:17:18 +02:00

Changed status from 'Open' to: 'Resolved'

Richard Antalik closed this issue

2019-07-09 00:17:18 +02:00

Richard Antalik self-assigned this 2019-07-09 00:17:18 +02:00

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VSE: keyframed Speed Control strips acting on Scene strips interfere with other keyframed strips #55192