I was adding a Glow effect to a sequence that also had a speed multiplier with 0,3. The result is that the Glow effect does not respect the speed effect and is faster than the video? This must be a bug? Or is there a workaround?
can you put the glow effect on the speed effect?
If not that, maybe render put the sped up clip then put glow on it.
I asked Grok on X and he said:
The issue you’re experiencing with the Glow effect not respecting the speed multiplier in Blender’s Video Sequence Editor (VSE) is a known behavior rather than a bug. The Glow effect in Blender VSE is applied independently of the speed control effect, which means it does not inherently adjust to changes in video playback speed. Here’s how you can approach this:
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Understanding the Behavior: When you apply a speed multiplier of 0.3, the video playback slows down, but effects like Glow continue to process at the original frame rate. This mismatch results in the Glow effect appearing to move faster relative to the slowed-down video.
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Workaround:
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Use a Meta Strip: One way to synchronize effects with speed changes is by grouping your video strip and speed control effect into a Meta Strip. After creating the Meta Strip, you can then apply the Glow effect to this combined strip. This can potentially make the Glow effect follow the speed control more closely, although it still might not be perfect due to how effects are calculated in Blender. To create a Meta Strip, select the video strip and the speed control effect strip, then press Ctrl+G.
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Adjust Effect Timing Manually: If the Meta Strip doesn’t fully synchronize the effect, you might need to manually adjust the Glow effect’s duration. This can be somewhat tedious, involving keyframing or manually trimming the effect strip to match the slowed-down video part.
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Alternative Effects: Consider using effects from the Compositor instead of VSE effects. The Compositor in Blender allows for more precise control over timing. You could use the Glow effect in the Compositor, which would then be applied post-speed adjustment. To do this, you would need to use the “Edit Strip with Compositor” add-on to apply compositor effects to VSE strips or render your video in segments where you apply effects separately.
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Blender Version: Ensure you’re using a recent version of Blender, as performance and behavior of effects strips might have been improved. For instance, Blender 2.77 and later versions have seen significant performance boosts for some VSE effects.
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Bug Report: If this behavior significantly impacts your workflow and you believe it’s a bug, consider submitting a bug report on the Blender developer platform, providing detailed steps to replicate the issue.
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These solutions might not be perfect, but they are the current workarounds for dealing with speed effects and additional effects like Glow in Blender’s VSE.
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Neat, glad that worked out.
I actually just tried my bit about applying the glow effect to the speed strip directly and that also works