This is a follow-up to the following ticket which was resolved for YouTube-only playlists but I’ll just list it here for reference.
There appears to be an issue (which may or may not be related to the above) with mixed YouTube/self-hosted playlists which only occurs on mobile and tablet (tested on android Galaxy Note 4, Note 8 and Tab 10.1).
To replicate, go to https://www.gortskehy.com/video-gallery/
Scroll down to the Geography section.
“Our visit to Mount Etna” is a YouTube video (don’t click on it). The other three are self-hosted. On an android mobile device play on any of the three self-hosted videos FIRST.
Expected behaviour: The video should play in the placeholder.
Actual behaviour: The video sound can be heard but the placeholder doesn’t show the actual video. It shows the splash image of the YouTube video.
Compare, for example with the History section on that page which contains only self-hosted videos and works as expected.
Playing YouTube videos in a mixed YouTube/self-hosted playlist work as expected. In the Science, Technology & Engineering section, for example, playing the YouTube video ‘Space is Amazing’ works fine but the self-hosted ‘BT Young Scientist’ video can be heard but not seen.
IMPORTANT NOTE: Playing a YouTube video in the playlist FIRST and then playing a self-hosted video works fine. The problem occurs when you try to play a self-hosted video first.
Using WordPress 4.9.8 and FV Player Pro 22.214.171.1247
If you need any further information just let me know.