Chrome: 64.0.3260.2
MR: 6417.1106.0.0
Platform: All Win 8, 10, and Mac
*Does not occur on Chrome 63
Repro steps:
1. start Chrome with the --enable-features=EnableCastLocalMedia flag
2. browse to vimeo.com/watch (any site will do other than the New Tab Page)
3. open the cast dialog, and in the drop down menu, select "Cast file"
4. Choose a media file from the file menu
5. Select a device from the device list
Expected: Casting succeeds
Actual: A new tab opens playing the local media file, but Casting doesn't start (sender dialog does not show any active session, and nothing happens on receiver)
*If in step 2, you are on a New Tab Page, then casting succeeds.
Comment 1 by amp@chromium.org
, Nov 22 2017