Video preview in VSE shows a distorted and jagged appearance at scale 1:1 #38860

New Issue

Lars Soderlind · 2014-02-27T02:01:45+01:00

Lars Soderlind commented

2014-02-27 02:01:45 +01:00

System Information
Windows 7 64-bit, 16GB RAM, i7-4770 CPU using Intel HD Graphics 4600

Blender Version
Broken: blender-2.70-testbuild1-win64
Worked: unknown

Short description of error
Video preview in VSE shows a distorted and jagged appearance at scale 1:1

If I load a video in the Video Sequence Editor and set the dimensions to match the original file and then press Numpad 1 to show it at scale 1:1, the video shows a kind of jaggedness that I would only expect if it was poorly resized. You can also see what looks like the bottom row of pixels wrongly at the top of the video.

A way to fix this is to press Home to fit video in window, then press middle mouse button and move slightly, then press numpad 1. This makes it suddenly look correct for me. To make it look wrong again press Home, then Numpad 1.

By changing the size of the Blender program window by just one pixel you can find a size that makes it look correct. I see this bug with Blender full-screen at 1920x1200 resolution.

I attached a small video to use as a test.
VSE_test.mp4

Exact steps for others to reproduce the error
Open Blender.
Load Factory Settings.
Change Render resolution to x:480 y:270 100%.
Select Video Editing Layout.
Add - Movie - "VSE_test.mp4".
Select Show preview 1:1 (Numpad 1).
Video looks distorted (If not, try changing Blender program window size).

Select Fit preview in window (Home).
Press middle mouse button and move video a little.
Select Show preview 1:1 (Numpad 1).
Video looks correct. (At any window size).

Select Fit preview in window (Home).
Select Show preview 1:1 (Numpad 1).
Video looks distorted again.

**System Information** Windows 7 64-bit, 16GB RAM, i7-4770 CPU using Intel HD Graphics 4600 **Blender Version** Broken: blender-2.70-testbuild1-win64 Worked: unknown **Short description of error** Video preview in VSE shows a distorted and jagged appearance at scale 1:1 If I load a video in the Video Sequence Editor and set the dimensions to match the original file and then press Numpad 1 to show it at scale 1:1, the video shows a kind of jaggedness that I would only expect if it was poorly resized. You can also see what looks like the bottom row of pixels wrongly at the top of the video. A way to fix this is to press Home to fit video in window, then press middle mouse button and move slightly, then press numpad 1. This makes it suddenly look correct for me. To make it look wrong again press Home, then Numpad 1. By changing the size of the Blender program window by just one pixel you can find a size that makes it look correct. I see this bug with Blender full-screen at 1920x1200 resolution. I attached a small video to use as a test. [VSE_test.mp4](https://archive.blender.org/developer/F79074/VSE_test.mp4) **Exact steps for others to reproduce the error** Open Blender. Load Factory Settings. Change Render resolution to x:480 y:270 100%. Select Video Editing Layout. Add - Movie - "VSE_test.mp4". Select Show preview 1:1 (Numpad 1). Video looks distorted (If not, try changing Blender program window size). Select Fit preview in window (Home). Press middle mouse button and move video a little. Select Show preview 1:1 (Numpad 1). Video looks correct. (At any window size). Select Fit preview in window (Home). Select Show preview 1:1 (Numpad 1). Video looks distorted again.

Lars Soderlind commented

2014-02-27 02:01:45 +01:00

Changed status to: 'Open'

Lars Soderlind commented

2014-02-27 02:01:45 +01:00

Added subscriber: @soderlind

Sergey Sharybin self-assigned this 2014-02-27 09:42:26 +01:00

Sergey Sharybin commented

2014-02-27 10:09:38 +01:00

Added subscriber: @brecht

Sergey Sharybin commented

2014-02-27 10:09:38 +01:00

This actually seems to be an issue with the intel card. Using GL_NEAREST filter results in the artifacts here. using GL_LINEAR makes things look smooth but it's not what you want when you're zoomed in.

@brecht, not sure how to solve this issue actually. One of ideas could be to use GL_LINEAR if zoom level is 1:1. but there might be some smarter solution which will always work?

This actually seems to be an issue with the intel card. Using GL_NEAREST filter results in the artifacts here. using GL_LINEAR makes things look smooth but it's not what you want when you're zoomed in. @brecht, not sure how to solve this issue actually. One of ideas could be to use GL_LINEAR if zoom level is 1:1. but there might be some smarter solution which will always work?

blender-admin commented

2014-04-01 12:41:48 +02:00

This issue was referenced by blender/blender-addons-contrib@467596dd36

This issue was referenced by blender/blender-addons-contrib@467596dd36f48c5779b094c2bfe74c322f19de3d

blender-admin commented

2014-04-01 12:41:48 +02:00

This issue was referenced by 467596dd36

This issue was referenced by 467596dd36f48c5779b094c2bfe74c322f19de3d

Sergey Sharybin commented

2014-04-01 12:42:10 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue