Try to make a extra pipe.ts like this:
import { NgModule } from '@angular/core';
import {YoutubePipe} from "./youtube/youtube";
@NgModule({
declarations: [
YoutubePipe,
],
imports: [
],
exports: [
YoutubePipe,
]
})
export class Pipes { }

And add it in the module.ts of the page where you want to use it:
import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { DesignerLabelDetailPage } from './designerlabel-detail';
import { Pipes } from '../../pipes/pipes';
@NgModule({
declarations: [
DesignerLabelDetailPage,
],
imports: [
IonicPageModule.forChild(DesignerLabelDetailPage),
Pipes,
],
exports: [
DesignerLabelDetailPage
]
})
export class DesignerLabelDetailPageModule {}
