Viewer node update error in the compositor when using the seperate/combine YCbCr nodes #39830

New Issue

Sergey Sharybin · 2014-04-21T16:49:08+02:00

b.compositor commented

2014-04-21 16:49:08 +02:00

(Migrated from localhost:3001)

System Information
Operating system and graphics card

GNU Linux, Ubuntu 13.10 (64 bit); ATI Radeon HD 7550M/7570M/7650M

Blender Version
Broken: (example: 2.69.7 4b206af, see splash screen)
f55ca54

Worked: (optional)
2.70a (latest official version)

Short description of error
Viewer node update error in the compositor when using the seperate/combine YCbCr nodes

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

open blender, change to compositor layout, import any image, add an image viewer, add an seperate YCbCr node, add a combine image node and plug its output to the viewer node.
Viewer node shows nothing but a light gray color (.5 for all 3 channels).

Notes:

Trying to manipulate the luma/chroma channels (which is why I needed this in the first place) has no effects on the image update
Rendering does work but the viewer node is not updated
Depending on the node setup, even rendering fails (!)
Chaning frames (which usually solves any image viewer update issues) does not help

**System Information** Operating system and graphics card GNU Linux, Ubuntu 13.10 (64 bit); ATI Radeon HD 7550M/7570M/7650M **Blender Version** Broken: (example: 2.69.7 4b206af, see splash screen) f55ca54 Worked: (optional) 2.70a (latest official version) **Short description of error** Viewer node update error in the compositor when using the seperate/combine YCbCr nodes **Exact steps for others to reproduce the error** Based on a (as simple as possible) attached .blend file with minimum amount of steps open blender, change to compositor layout, import any image, add an image viewer, add an seperate YCbCr node, add a combine image node and plug its output to the viewer node. Viewer node shows nothing but a light gray color (.5 for all 3 channels). Notes: - Trying to manipulate the luma/chroma channels (which is why I needed this in the first place) has no effects on the image update - Rendering does work but the viewer node is not updated - Depending on the node setup, even rendering fails (!) - Chaning frames (which usually solves any image viewer update issues) does not help

b.compositor commented

2014-04-21 16:49:09 +02:00

(Migrated from localhost:3001)

Changed status to: 'Open'

b.compositor commented

2014-04-21 16:49:09 +02:00

(Migrated from localhost:3001)

Added subscriber: @b.compositor

Sergey Sharybin commented

2014-04-21 17:47:41 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2014-04-21 17:47:41 +02:00

Works fine here. Please always attach the file which demonstrates the issue, this eliminates the probability of misreading your steps.

Kévin Dietrich commented

2014-04-21 18:28:45 +02:00

Added subscriber: @kevindietrich

Kévin Dietrich commented

2014-04-21 18:28:45 +02:00

I can reproduce the issue, but the weird thing is that it is random... If I scrubble though the outputs of the "separate YCbCrA" node, sometimes I get the proper channel, sometimes I get a plain grey image. So my guess is that the issue lays in this node and not the viewer node itself.

Here's my blendfile :
YCbCr_bug.blend

I can reproduce the issue, but the weird thing is that it is random... If I scrubble though the outputs of the "separate YCbCrA" node, sometimes I get the proper channel, sometimes I get a plain grey image. So my guess is that the issue lays in this node and not the viewer node itself. Here's my blendfile : [YCbCr_bug.blend](https://archive.blender.org/developer/F85544/YCbCr_bug.blend)

Kévin Dietrich commented

2014-04-21 18:33:41 +02:00

Also there's a scale node in my setup, usually Blender lags by me when I use too big of an image, so I always put one, but it's not affecting the issue.

b.compositor commented

2014-04-21 23:25:41 +02:00

(Migrated from localhost:3001)

Here's a sample file demonstrating the problem with 9b0ab89

compositor_viewer_node_bug_report.blend.zip

Here's a sample file demonstrating the problem with 9b0ab89 [compositor_viewer_node_bug_report.blend.zip](https://archive.blender.org/developer/F85568/compositor_viewer_node_bug_report.blend.zip)

b.compositor commented

2014-04-21 23:28:11 +02:00

(Migrated from localhost:3001)

Opening that same file with 2.70a works, though it fails with git master

b.compositor commented

2014-04-21 23:31:13 +02:00

(Migrated from localhost:3001)

Btw note that earlier today on #blender irc channel another linux user also confirmed having similar issues with git master on 64bit linux

Kévin Dietrich commented

2014-04-23 14:46:41 +02:00

@Sergey: I found the actual bug, I tried with a debug build and GDB -> crash

This is what I get in the console:

blender: /home/kevin/Programmation/blender-git/blender/source/blender/blenlib/intern/math_color.c:215: rgb_to_ycc: Assertion `!"invalid colorspace"' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffc42b8700 (LWP 11893)]

0x00007ffff31b7037 in raise () from /lib/x86_64-linux-gnu/libc.so.6

It happens as soon as I connect one of the outputs of the Separate YCbCrA node with the Viewer Node. It is the only Separate/Combine node to be affected. So far I'm unable to fix this...

@Sergey: I found the actual bug, I tried with a debug build and GDB -> crash This is what I get in the console: ``` blender: /home/kevin/Programmation/blender-git/blender/source/blender/blenlib/intern/math_color.c:215: rgb_to_ycc: Assertion `!"invalid colorspace"' failed. Program received signal SIGABRT, Aborted. [Switching to Thread 0x7fffc42b8700 (LWP 11893)] ``` 0x00007ffff31b7037 in raise () from /lib/x86_64-linux-gnu/libc.so.6 It happens as soon as I connect one of the outputs of the Separate YCbCrA node with the Viewer Node. It is the only Separate/Combine node to be affected. So far I'm unable to fix this...

blender-admin commented

2014-04-24 11:17:14 +02:00

This issue was referenced by blender/blender-addons-contrib@488581bfc6

This issue was referenced by blender/blender-addons-contrib@488581bfc6cef42a966e6e37b010a4338c812f8b

blender-admin commented

2014-04-24 11:17:14 +02:00

This issue was referenced by 488581bfc6

This issue was referenced by 488581bfc6cef42a966e6e37b010a4338c812f8b

Sergey Sharybin commented

2014-04-24 11:18:58 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue