[BUG] Scrubbing in iOS native player is slow

[elynema]

Describe the bug
When scrubbing in the iOS native player, the scrubbing is pretty slow. We observed this primarily when playing media from the context of a playlist, but there is also some slowness on the media object page. Scrubbing is taking 3-4 seconds rather than 1-2 seconds.

Note that Charu has also reported that sometimes the scrubbing just doesn't work (doesn't respond). This one is not as easy to replicate.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://avalon-staging.dlib.indiana.edu/playlists/34 on iPhone (Safari) or iPad (chrome). Both these use the iOS native player for full-screen playback.
2. Play the first section. If you are using iPad, play in full-screen.
3. Try scrubbing back and forth. Generally, the scrubbing works, but there is a 3-4 second delay at least.

Expected behavior
Our goal is to have scrubbing be responsive in more like 1-2 seconds.

Screenshots

iphone-scrubbing-short.mov

Smartphone (please complete the following information):

• Device: iPhone / iPad
• OS: iOS 17
• Browser: Safari on iPhone and Chrome on iPad

[joncameron]

Needs to be tested against Ramp demo site—may be resolved with recent merge.

Edit: Tested and still an issue.

[joncameron]

This could be looked at and tested for Ramp refactoring—that could improve this. This can be marked as a known issue for the moment. We could try to resolve this within Avalon, or make this part of the effort to avoid using the iOS native player when possible due to the lack of control we have over it.

[elynema]

This shows scrubbing taking more like 10 seconds.

Private Zenhub Video