Negative frames not being played in current project #81286

New Issue

Tomasz Kaye · 2020-09-29T09:53:10+02:00

Tomasz Kaye commented

2020-09-29 09:53:10 +02:00

System Information
Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-26 20:04, hash: 8c81b3fb8b

Short description of error
Negative frames don't play back in my .blend file (although playback/rendering range and 'Allow Negative Frames' both seem to be set correctly.

Exact steps for others to reproduce the error

Open attached .blend
Ensure that 'Allow Negative Frames' is ticked in Preferences > Animation
Try to play the timeline starting from a negative frame
Playhead skips to frame 0 and plays from there instead

Notes

New scenes created in this same project have the same problem.
If i create a new .blend i don't get this problem in the default scene. But if i append the problem scene into the new project, that scene exhibits the same problem (trying to find a way to salvage the project I'm working on)

sexandtaxes_negstartframebug.blend

**System Information** Operating system: Darwin-19.3.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 580 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.5.5 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-26 20:04, hash: `8c81b3fb8b` **Short description of error** Negative frames don't play back in my .blend file (although playback/rendering range and 'Allow Negative Frames' both seem to be set correctly. **Exact steps for others to reproduce the error** * Open attached .blend * Ensure that 'Allow Negative Frames' is ticked in Preferences > Animation * Try to play the timeline starting from a negative frame * Playhead skips to frame 0 and plays from there instead **Notes** * New scenes created in this same project have the same problem. * If i create a new .blend i don't get this problem in the default scene. But if i append the problem scene into the new project, that scene exhibits the same problem (trying to find a way to salvage the project I'm working on) [sexandtaxes_negstartframebug.blend](https://archive.blender.org/developer/F8935179/sexandtaxes_negstartframebug.blend)

Tomasz Kaye commented

2020-09-29 09:53:10 +02:00

Added subscriber: @info-27

Raimund Klink commented

2020-09-29 10:59:16 +02:00

Added subscriber: @Raimund58

Raimund Klink commented

2020-09-29 10:59:16 +02:00

Hm, how did you even set the "start frame -100"? I can't do that...
It also skips to frame 0 when I test your blend.
Tested with Blender 2.90.1

Hm, how did you even set the "start frame -100"? I can't do that... It also skips to frame 0 when I test your blend. Tested with Blender 2.90.1

Tomasz Kaye commented

2020-09-29 11:14:38 +02:00

yes, i think that's another bug (that you can't set negative frames via the usual number fields)

Move playhead to negative frame
Timeline view > Playback > "Set Start Frame" button

yes, i think that's another bug (that you can't set negative frames via the usual number fields) 1. Move playhead to negative frame 2. Timeline view > Playback > "Set Start Frame" button

Richard Antalik commented

2020-10-07 13:26:03 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-10-07 13:26:03 +02:00

In a4f8b2ad76 you could set negative frame range and play it back, just enable "allow negative frames" in user preferences.

Now with 4bb15c8eec it doesn't work so this is very recent change. Perhaps intentional checking...

In a4f8b2ad76 you could set negative frame range and play it back, just enable "allow negative frames" in user preferences. Now with 4bb15c8eec it doesn't work so this is very recent change. Perhaps intentional checking...

Richard Antalik commented

2020-10-07 13:38:12 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Richard Antalik closed this issue

2020-10-07 13:38:12 +02:00

Richard Antalik self-assigned this 2020-10-07 13:38:12 +02:00

Richard Antalik commented

2020-10-07 13:38:12 +02:00

So the bug with this file is, that it has AV sync enabled - Scene audio begins on frame 0 so this will force playhead to jump there. Therefore this is not a bug.

The recent change I talked about is intentional, see ca38bce46a, though it has some negative implications IMO. Not a bug as well though.

So the bug with this file is, that it has AV sync enabled - Scene audio begins on frame 0 so this will force playhead to jump there. Therefore this is not a bug. The recent change I talked about is intentional, see ca38bce46a, though it has some negative implications IMO. Not a bug as well though.

Philipp Oeser commented

2020-10-07 13:46:26 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-10-07 13:46:26 +02:00

Changed status from 'Archived' to: 'Needs User Info'

Philipp Oeser reopened this issue

2020-10-07 13:46:26 +02:00

Philipp Oeser commented

2020-10-07 13:46:26 +02:00

Thats because of ca38bce46a.
This ensured that no negative frames can be set for the rendering range.

To playback negative frames you need to

- enable Allow Negative Frames
- use the Preview Range

Timeline view > Playback > "Set Start Frame" button will work then.

I know it is a bit of a convoluted workflow, but having negative frames in the rendering range is also no good...
Does this work for you?

Thats because of ca38bce46a. This ensured that no negative frames can be set for the rendering range. To playback negative frames you need to - - [x] enable `Allow Negative Frames` - - [x] use the Preview Range ![image.png](https://archive.blender.org/developer/F8964495/image.png) Timeline view > Playback > "Set Start Frame" button will work then. I know it is a bit of a convoluted workflow, but having negative frames in the rendering range is also no good... Does this work for you?

Campbell Barton commented

2020-10-27 06:25:17 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2020-10-27 06:25:17 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Campbell Barton closed this issue

2020-10-27 06:25:17 +01:00

Campbell Barton commented

2020-10-27 06:25:17 +01:00

More than a week without reply or activity.
Due to the policy of the tracker closing for until required info/data are provided.

If the problem persists please open a new report with the required information.

More than a week without reply or activity. Due to the policy of the tracker closing for until required info/data are provided. If the problem persists please open a new report with the required information.

Tomasz Kaye commented

2020-10-27 12:20:21 +01:00

sorry for overlooking the request for more information.

my case was: i wanted to retime a scene with existing animation of different kinds (grease pencil, parameter keyframes). i needed to add extra time to the start of the animation. i was reluctant to try to shift all animation forwards in time because i thought i might miss something and mess up the scene. if it was possible to edit and render negative frames, this would have been a 'safer' way to get the extra time i wanted.

i understand that this isn't an option technically, leaving it as invalid is fine.

sorry for overlooking the request for more information. my case was: i wanted to retime a scene with existing animation of different kinds (grease pencil, parameter keyframes). i needed to add extra time to the start of the animation. i was reluctant to try to shift all animation forwards in time because i thought i might miss something and mess up the scene. if it was possible to edit and render negative frames, this would have been a 'safer' way to get the extra time i wanted. i understand that this isn't an option technically, leaving it as invalid is fine.

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Negative frames not being played in current project #81286