vaapipostproc + colorbalance not working properly

[Víctor Jáquez]

On Tue, 16 Jul 2019 at 08:14, Timtchenko, Michael wrote:
> Hi all,
> 
> i'm facing an issue related to gstreamers module "vaapipostproc" in version 1.14.4. I'm trying to adjust the colorbalance of a video stream by setting the following properties
> 
> 
> -          saturation
> 
> -          contrast
> 
> -          brightness
> 
> while active streaming.
> 
> I'm doing this by setting the following properties:
> 
> g_object_set( G_OBJECT( vaapipostproc ), "saturation", saturation, NULL );
> g_object_set( G_OBJECT( vaapipostproc ), "contrast", contrast, NULL );
> g_object_set( G_OBJECT( vaapipostproc ), "brightness", brightness, NULL );
> 
> whereas saturation, contrast and brightness are properly initialized gfloat variables.
> 
> It seems that there is a domination order contrast > brightness > saturation.
> 
> I'll explain this shortly:
> 
> Case I:
> 
> 1.       Setting saturation to maximum -> Image is properly adjusted
> 
> 2.       Minimal reduction of brightness -> Saturation of image is reset
> 
> 3.       Resetting brightness to default value -> Image has again the saturation of (1)
> 
> Case II:
> 
> 1.       Setting brightness to maximum -> Image is properly adjusted
> 
> 2.       Minimal reduction of contrast -> Brightness of image is reset
> 
> 3.       Resetting contrast to default value -> Image has again the brightness of (1)
> 
> Case III:
> 
> 1.       Setting saturation to maximum -> Image is properly adjusted
> 
> 2.       Minimal reduction of contrast -> Saturation of the image is reset
> 
> 3.       Resetting the contrast to default value -> Image has again the saturation of (1)
> 
> 
> I've checked this behavior by setting the property values programmatically in code and also by setting up the pipeline with the corresponding values up front.
> 
> Am I doing wrong, or is there a bug in the module "vaapipostproc"?

It smells like a bug. But before, what backend are you using? can you share your
test app? and finally, can you share a GST_DEBUG=vaapipostproc:5 log?

You can open an issue in gitlab and upload those files :)

Thanks

vmjl