Remove redundant constant from conversion shader

build/data/libobs/format_conversion.effect

@@ -30,7 +30,6 @@ uniform float     width_d2;
 uniform float     height_d2;
 uniform float     width_d2_i;
 uniform float     height_d2_i;
-uniform float     input_width;
 uniform float     input_height;
 
 uniform texture2d image;
@@ -62,7 +61,7 @@ float4 PSPlanar420(VertInOut vert_in) : TARGET
 	float v_mul = floor(vert_in.uv.y * input_height);
 #endif
 
-	float byte_offset = floor((v_mul + vert_in.uv.x) * input_width) * 4.0;
+	float byte_offset = floor((v_mul + vert_in.uv.x) * width) * 4.0;
 
 	float2 sample_pos[4];
 

libobs/obs-video.c

@@ -171,7 +171,6 @@ static void render_convert_texture(struct obs_core_video *video,
 	set_eparam(effect, "height_d2", fheight * 0.5f);
 	set_eparam(effect, "width_d2_i",  1.0f / (fwidth  * 0.5f));
 	set_eparam(effect, "height_d2_i", 1.0f / (fheight * 0.5f));
-	set_eparam(effect, "input_width", fwidth);
 	set_eparam(effect, "input_height", (float)video->conversion_height);
 
 	effect_settexture(effect, image, texture);