Waveforms in vse vanish when a strip has a volume fcurve with no animation points. #69564

New Issue

hudson barkley · 2019-09-06T00:33:29+02:00

hudson barkley commented

2019-09-06 00:33:29 +02:00

Blender Version
Broken: 2.80, 2.81

Short description of error
When an fcurve is created on a vse strip in python, but no points are added to the curve, the waveform vanishes (as if it is at volume 0), and it will not display again until the fcurve is removed, or a point is added.
Note: the audio will still play back fine, so this seems to be exclusively limited to waveform display.

Exact steps for others to reproduce the error

Enable waveform display (View menu > Waveform Displaying > Waveforms On)
Load 2 audio files into a fresh vse
Add an animation point to audio file 1 (to ensure the scene has animation data)
Select only audio file 2
Paste the following into a console:

bpy.context.scene.animation_data.action.fcurves.new(data_path=bpy.context.scene.sequence_editor.active_strip.path_from_id('volume'))

Move the cursor to cause a refresh.

**Blender Version** Broken: 2.80, 2.81 **Short description of error** When an fcurve is created on a vse strip in python, but no points are added to the curve, the waveform vanishes (as if it is at volume 0), and it will not display again until the fcurve is removed, or a point is added. Note: the audio will still play back fine, so this seems to be exclusively limited to waveform display. **Exact steps for others to reproduce the error** 1. Enable waveform display (View menu > Waveform Displaying > Waveforms On) 2. Load 2 audio files into a fresh vse 3. Add an animation point to audio file 1 (to ensure the scene has animation data) 4. Select only audio file 2 5. Paste the following into a console: ``` bpy.context.scene.animation_data.action.fcurves.new(data_path=bpy.context.scene.sequence_editor.active_strip.path_from_id('volume')) ``` 6. Move the cursor to cause a refresh.

hudson barkley commented

2019-09-06 00:33:29 +02:00

Added subscriber: @snuq

Justin commented

2019-09-14 20:44:23 +02:00

Added subscriber: @BlenderFrenzy

Justin commented

2019-09-14 20:44:23 +02:00

This same thing happens when adjusting the Hold Cut start/end frames in strip's Time properties.

Reproduce:

Select Audio Strip
Check Display Waveform (Properties Panel > Adjust > Sound > Display Waveform)
Adjust Start/End frames of the Hold Cut (Properties Panel > Time > Hold Offset Start/End

Usually only happens when adjusting the End frame for me
The first couple adjustments don't reproduce the error. Must adjust several times.

Workaround:

In order to refresh the audio to see the waveforms again, follow these steps:

Save your file
Go to File > Open Recent > The file you just saved

This same thing happens when adjusting the Hold Cut start/end frames in strip's Time properties. Reproduce: 1. Select Audio Strip 2. Check Display Waveform (Properties Panel > Adjust > Sound > Display Waveform) 3. Adjust Start/End frames of the Hold Cut (Properties Panel > Time > Hold Offset Start/End * Usually only happens when adjusting the End frame for me * The first couple adjustments don't reproduce the error. Must adjust several times. Workaround: In order to refresh the audio to see the waveforms again, follow these steps: 1. Save your file 2. Go to File > Open Recent > The file you just saved

Richard Antalik commented

2019-09-16 00:40:53 +02:00

Added subscriber: @iss

Richard Antalik commented

2019-09-16 00:40:53 +02:00

@BlenderFrenzy This is completely different bug.

There is waveform redraw forced somewhere deep in depsgraph probably.
Can not make fix right away unfortunately.

@BlenderFrenzy This is completely different bug. There is waveform redraw forced somewhere deep in depsgraph probably. Can not make fix right away unfortunately.

Richard Antalik commented

2019-09-16 01:16:27 +02:00

@BlenderFrenzy I will post this bug so I won't forget