Video Sequence Editor lost stereoscopic preview #77564

System Information
Operating system: Linux-4.19.0-9-amd64-x86_64-with-debian-10.4 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 18.3.6

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 12:23, hash: 82e3bd4bbb (also broken in 2.83.0 downlaoded from the main download page)
Worked: 2.83 alpha (I only have a custom build lying around, sorry, but it was before https://developer.blender.org/T71546 -- on which one can see the VSE trying to render the stereoscopic preview)
Short description of error
When loading a stereoscopic image sequence on the VSE the preview shows only a monoscopic version even though when I render the image, the stereoscopic image is rendered as expected.
On older builds it rendered the stereoscopic preview correctly (if the strip was the same size as the output, https://developer.blender.org/T71546)

Exact steps for others to reproduce the error

Create a new file.
In the output properties, turn on stereoscopy.

On the VSE editor, import the DSCF****_L.jpg files on the attached zip — on the options select "use multi view" and leave "individual".

I'm uploading a zip file with a couple of stereo images, for debugging comfort.

vse-stereoscopy-preview.zip

NOTE: while doing tests on the previous "working" (although admittedly dodgy) build, I could see the 3D previews but the renders were black on the image editor.
I'm not sure if that's related or not, but still I wanted to mention it.

On a recent build,

On an old build,

**System Information** Operating system: Linux-4.19.0-9-amd64-x86_64-with-debian-10.4 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 18.3.6 **Blender Version** Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 12:23, hash: `82e3bd4bbb` (also broken in 2.83.0 downlaoded from the main download page) Worked: 2.83 alpha (I only have a custom build lying around, sorry, but it was before https://developer.blender.org/T71546 -- on which one can see the VSE trying to render the stereoscopic preview) **Short description of error** When loading a stereoscopic image sequence on the VSE the preview shows only a monoscopic version even though when I render the image, the stereoscopic image is rendered as expected. On older builds it rendered the stereoscopic preview correctly (if the strip was the same size as the output, https://developer.blender.org/T71546) **Exact steps for others to reproduce the error** - Create a new file. - In the output properties, turn on stereoscopy. # On the VSE editor, import the DSCF****_L.jpg files on the attached zip — on the options select "use multi view" and leave "individual". I'm uploading a zip file with a couple of stereo images, for debugging comfort. [vse-stereoscopy-preview.zip](https://archive.blender.org/developer/F8588737/vse-stereoscopy-preview.zip) **NOTE:** while doing tests on the previous "working" (although admittedly dodgy) build, I could see the 3D previews but the renders were black on the image editor. I'm not sure if that's related or not, but still I wanted to mention it. On a recent build, ![A-BROKEN-NOW_feh_023802_000002_2020-06-07-091813_1920x1080_scrot.png](https://archive.blender.org/developer/F8588754/A-BROKEN-NOW_feh_023802_000002_2020-06-07-091813_1920x1080_scrot.png) On an old build, ![B-WORKING-BEFORE_feh_023802_000001_2020-06-07-091627_1920x1080_scrot.png](https://archive.blender.org/developer/F8588753/B-WORKING-BEFORE_feh_023802_000001_2020-06-07-091627_1920x1080_scrot.png)

Added subscriber: @GabrielMontagne

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

Added subscriber: @Jeroen-Bakker

Could be that the new stereo rendering assumes that stereo rendering always happen in a GPUViewport. As VSE doesn't use a GPUViewport it does not render correctly anymore. Actually the stereo composite isn't executed anymore. This change was needed to solve color management issues in the viewport and make sure the image editor displays the correct results. I have missed this one.

My proposal is to make the scene sequencer preview a GPU viewport this is the most future proof way and use the global window stereo setting.
Current implementation seems to be a per strip setting. But that will change current workflow.

@iss: What do you think?

Added subscriber: @iss

In #77564#953852, @Jeroen-Bakker wrote:
My proposal is to make the scene sequencer preview a GPU viewport this is the most future proof way and use the global window stereo setting.
Current implementation seems to be a per strip setting. But that will change current workflow.

@iss: What do you think?

Can you give me some reference or elaborate a bit more? (read what should I do?)

Added subscriber: @dfelinto

Issue introduced on fe045b2b77.

This issue was referenced by 2e908156d0

Changed status from 'Confirmed' to: 'Resolved'

This issue was referenced by 47c6f41b89

This issue was referenced by 40edb84dcf

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Video Sequence Editor lost stereoscopic preview #77564

On the VSE editor, import the DSCF****_L.jpg files on the attached zip — on the options select "use multi view" and leave "individual".