diff --git a/xmodule/video_block/video_block.py b/xmodule/video_block/video_block.py
index 0df838f90c09..34f0999962c0 100644
--- a/xmodule/video_block/video_block.py
+++ b/xmodule/video_block/video_block.py
@@ -1214,9 +1214,9 @@ def student_view_data(self, context=None):
         # Fall back to other video URLs in the video block if not found in VAL
         if not encoded_videos:
             if all_sources:
-                encoded_videos["fallback"] = {
+                encoded_videos["mobile_high"] = {
                     "url": all_sources[0],
-                    "file_size": 0,  # File size is unknown for fallback URLs
+                    "file_size": self.file_size,
                 }
 
             # Include youtube link if there is no encoding for mobile- ie only a fallback URL or no encodings at all
@@ -1235,7 +1235,7 @@ def student_view_data(self, context=None):
 
         return {
             "only_on_web": self.only_on_web,
-            "duration": val_video_data.get('duration', None),
+            "duration": int(val_video_data.get('duration', self.file_length.total_seconds())),
             "transcripts": transcripts,
             "encoded_videos": encoded_videos,
             "all_sources": all_sources,
diff --git a/xmodule/video_block/video_xfields.py b/xmodule/video_block/video_xfields.py
index 873ed01f285c..907eb4bea4b8 100644
--- a/xmodule/video_block/video_xfields.py
+++ b/xmodule/video_block/video_xfields.py
@@ -5,7 +5,7 @@
 
 import datetime
 
-from xblock.fields import Boolean, DateTime, Dict, Float, List, Scope, String
+from xblock.fields import Boolean, DateTime, Dict, Float, List, Scope, String, Integer
 
 from xmodule.fields import RelativeTime
 
@@ -93,6 +93,18 @@ class VideoFields:
         display_name=_("Video File URLs"),
         scope=Scope.settings,
     )
+    file_size = Integer(
+        help=_("Add video size. This size appears in mobile app via file downloading"),
+        display_name=_("Video File Size"),
+        scope=Scope.settings,
+        default=0
+    )
+    file_length = RelativeTime(
+        help=_("Add video length. This length appears in mobile app via file downloading. Formatted as HH:MM:SS"),
+        display_name=_("Video File Length"),
+        scope=Scope.settings,
+        default=datetime.timedelta(seconds=0)
+    )
     track = String(
         help=_("By default, students can download an .srt or .txt transcript when you set Download Transcript "
                "Allowed to True. If you want to provide a downloadable transcript in a different format, we recommend "