Update contents.json

remove broken links

Author: krzemienski

contents.json

@@ -2882,11 +2882,6 @@
             "title": "MPEG High Efficiency Image File Format (HEIF)",
             "homepage": "https://nokiatech.github.io/heif/"
         },
-        {
-            "category": "mpeg",
-            "title": "MPEG future",
-            "homepage": "http://mpegfuture.org/"
-        },
         {
             "category": "mpeg",
             "title": "MPEG About",
@@ -4424,12 +4419,6 @@
             "homepage": "https://slhck.info/video/2017/03/01/rate-control.html",
             "category": "ffmpeg"
         },
-        {
-            "description": "",
-            "title": "DASH-IF Live Media Ingest Protocol",
-            "homepage": "https://dashif-documents.azurewebsites.net/Ingest/master/DASH-IF-Ingest.pdf",
-            "category": "dash"
-        },
         {
             "description": "Web app for validating CPIX documents. Contribute to Axinom/cpix-validator development by creating an account on GitHub.",
             "title": "Axinom/cpix-validator: Web app for validating CPIX documents",