Video rendered with slightly wrong colours on Galaxy S8

Thanks, I should definitely try this out! Could you maybe give me some direction how to work with this target? I've already read the specification but I can't really find any other resources and I'm not really the Open GL expert here - as you probably can tell :)

This is my current fragment shader:

#extension GL_OES_EGL_image_external : require
uniform samplerExternalOES texture;
varying highp vec2 varTexCoordinate;
void main()
{
    gl_FragColor = texture2D(texture, varTexCoordinate);
}

And this is how my texture is bound:

GLES20.glActiveTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);
GLES20.glGenTextures(1, textures, 0);
GLES20.glBindTexture(0, textures[0]);

#version 310 es
#extension GL_EXT_yuv_target : require
precision mediump float;

uniform mediump __samplerExternal2DY2YEXT uVideo;

vec3 yuv_to_rgb(vec3 yuv)
{
	yuv -= vec3(16.0 / 255.0, 128.0 / 255.0, 128.0 / 255.0);
	return yuv.xxx * 1.164 + yuv.yyy * vec3(0.0, -0.391, 2.018) + yuv.zzz * vec3(1.596, -0.813, 0.0);
}

out vec3 FragColor;
in vec2 vTex;

void main()
{
    FragColor = yuv_to_rgb(texture(uVideo, vTex).rgb);
}

Something like this to do manual YUV conversion. Replace yuv_to_rgb as you see fit.

Thanks so much! You definitely are my hero of the day :) 

*except that i had to change GL_EXT_yuv_target to GL_EXT_YUV_target in the 2nd line

Hi again,

It turns out that there are some other phones (namely Huawei M8 and P9 - that I know of) that have the same issue, but they don't have the GL_EXT_YUV_target extension. Do you have any idea maybe, how  the manual conversion could be done in this case? 

Yeah, I know this isn't exactly the right forum for these questions, but it seems you are far more experienced in this area then I am. Maybe you can save me some couple more days of research :)

If it doesn't have EXT_yuv_target, you'll probably have to construct a custom transform which inverts the RGB -> YUV transforms and transforms to YUV again with a different matrix.

If input is BT.604 and you need BT.709, I suppose you can build a matrix

m = bt709_transform * inverse(bt604_transform) on CPU,

and pass that down to the fragment shader as a uniform. That's the best option I can think of. Does the video have proper color space set in the H.264 (?) stream to begin with though?

Ok so, I got the conversions working for both formats, now I just can't determine when to use which one. Is there any way to find out which conversion OpenGL is using internally with samplerExternalOES textures?