adding a movie strip to the video sequence editor changes the scene frame rate, this breaks all alembic currrently in use by the scene if they have a different framerate #91788

New Issue

michael campbell · 2021-09-28T18:59:03+02:00

michael campbell commented

2021-09-28 18:59:03 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-22 23:29, hash: a78d3c5261
Worked: (newest version of Blender that worked as expected)

Short description of error
adding a movie strip to the video sequence editor changes the scene frame rate, this breaks all alembic files currrently in use by the scene if they have a different framerate

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-22 23:29, hash: `a78d3c5261` Worked: (newest version of Blender that worked as expected) **Short description of error** adding a movie strip to the video sequence editor changes the scene frame rate, this breaks all alembic files currrently in use by the scene if they have a different framerate

michael campbell commented

2021-09-28 18:59:03 +02:00

Added subscriber: @3di

tintwotin commented

2021-09-28 20:44:58 +02:00

Added subscriber: @tintwotin

tintwotin commented

2021-09-28 20:44:58 +02:00

If you use the Add Movie menu, you'll need to uncheck Use Movie Framerate when importing the first video file:
{F10655226,size=full}

If you drag and drop from the embedded file browser, you do not have that option, since it wasn't prioritized to do the work to make the File Browser actually work for the VSE and ex. expose a sidebar or an import button(to import multiple files), by adding a View Mode option to the embedded File Browsers.

If you use the Add Movie menu, you'll need to uncheck `Use Movie Framerate` when importing the first video file: {[F10655226](https://archive.blender.org/developer/F10655226/image.png),size=full} If you drag and drop from the embedded file browser, you do not have that option, since it wasn't prioritized to do the work to make the File Browser actually work for the VSE and ex. expose a sidebar or an import button(to import multiple files), by adding a View Mode option to the embedded File Browsers.

michael campbell commented

2021-09-28 22:41:38 +02:00

@tintwotin problem for me was when dragging it in from windows file explorer. Perhaps it would be better design if user settings were not automatically changed without warning. Maybe a popup which gives the option for the scene to adopt the clip's framerate, or the clip to adopt the scene's framerate.

It was only after downgrading to a previous build of blender and still getting the same timing problems with alembic files that I realised the VSE had changed the scene framerate, so it would be nice to save other's from needing to troubleshoot.

@tintwotin problem for me was when dragging it in from windows file explorer. Perhaps it would be better design if user settings were not automatically changed without warning. Maybe a popup which gives the option for the scene to adopt the clip's framerate, or the clip to adopt the scene's framerate. It was only after downgrading to a previous build of blender and still getting the same timing problems with alembic files that I realised the VSE had changed the scene framerate, so it would be nice to save other's from needing to troubleshoot.

Philipp Oeser commented

2021-09-30 10:43:25 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-09-30 10:43:25 +02:00

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

Philipp Oeser commented

2021-09-30 10:43:25 +02:00

problem for me was when dragging it in from windows file explorer.

Not sure what the problem with that is? (you are still getting the Adjust Last Operation -- of {key F9} -- panel where this option can be disabled)

> problem for me was when dragging it in from windows file explorer. Not sure what the problem with that is? (you are still getting the `Adjust Last Operation` -- of {key F9} -- panel where this option can be disabled)

michael campbell commented

2021-09-30 17:37:20 +02:00

@lichtwerk I guess. Perhaps the option should be off by default, because I guess a lot of people will probably do what I did; drop the movie in, not bother to open up the redo panel, and not realise the scene framerate has been changed.

Philipp Oeser commented

2021-09-30 18:20:58 +02:00

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

tintwotin commented

2021-09-30 18:22:37 +02:00

Removed subscriber: @tintwotin

Richard Antalik commented

2021-09-30 18:48:26 +02:00

Added subscriber: @iss

Richard Antalik commented

2021-09-30 18:48:26 +02:00

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

Richard Antalik commented

2021-09-30 18:48:26 +02:00

In #91788#1228925, @3di wrote:
@lichtwerk I guess. Perhaps the option should be off by default, because I guess a lot of people will probably do what I did; drop the movie in, not bother to open up the redo panel, and not realise the scene framerate has been changed.

On the other hand, lot of people adds movie file and expects frame rate to be adjusted so sound and video will be in sync.

This property is disabled once sequencer has some strips, so similar checks could be added for scene data. In general it is best to reserve separate scene if you want to use sequencer in it.

I can confirm as known issue but don't think current default behavior should be changed.

> In #91788#1228925, @3di wrote: > @lichtwerk I guess. Perhaps the option should be off by default, because I guess a lot of people will probably do what I did; drop the movie in, not bother to open up the redo panel, and not realise the scene framerate has been changed. On the other hand, lot of people adds movie file and expects frame rate to be adjusted so sound and video will be in sync. This property is disabled once sequencer has some strips, so similar checks could be added for scene data. In general it is best to reserve separate scene if you want to use sequencer in it. I can confirm as known issue but don't think current default behavior should be changed.

michael campbell commented

2021-09-30 18:57:20 +02:00

@iss Perhaps a better solution which would work for both cases, would be to not automatically change the scene frames per second and also keep the sequencer audio/video in sync by automatically adding a speed control effect set to stretch to the movie file's video strip, and then setting the length of the video strip to match the audio strip.

Richard Antalik commented

2021-09-30 19:08:04 +02:00

I worked on solution like that, but it was rejected by studio animators. It wasn't exactly what you propose, but in principle it was. Then again if that was done I am quite sure this wouldn't be well received.

I think we will revisit this at some point so will see if solution could be found that doesn't result in problems like this.

I worked on solution like that, but it was rejected by studio animators. It wasn't exactly what you propose, but in principle it was. Then again if that was done I am quite sure this wouldn't be well received. I think we will revisit this at some point so will see if solution could be found that doesn't result in problems like this.

michael campbell commented

2021-09-30 19:39:44 +02:00

Yeah, I mean personally off by default would be my preference, because at least that way you know immediately that there's a framerate mismatch; as the audio and video strip will be a different size, whereas currently it just breaks all frame rate dependant elements of the scene (alembic, rendering, baked sims etc), and the user is left completely unaware.

Once the user is aware of the mismatch they know they need to check in the redo panel or n panel to change that setting. After that the setting will be kept for the life of the file presumably?

Or alternatively a little popup notification to let the user know the scene fps was changed to match the clip they've dragged in.

Yeah, I mean personally off by default would be my preference, because at least that way you know immediately that there's a framerate mismatch; as the audio and video strip will be a different size, whereas currently it just breaks all frame rate dependant elements of the scene (alembic, rendering, baked sims etc), and the user is left completely unaware. Once the user is aware of the mismatch they know they need to check in the redo panel or n panel to change that setting. After that the setting will be kept for the life of the file presumably? Or alternatively a little popup notification to let the user know the scene fps was changed to match the clip they've dragged in.

Philipp Oeser removed the

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adding a movie strip to the video sequence editor changes the scene frame rate, this breaks all alembic currrently in use by the scene if they have a different framerate #91788