Workaround: customize UpNext / Next Episode prompt timing in Emby Web

[lolotux 4]

Hi,

I found a workaround to change when the “Next Episode / Up Next” prompt appears in Emby Web.

Tested on Emby 4.9.5.0.

File:
 /opt/emby-server/system/dashboard-ui/videoosd/videoosd.js

Original logic uses:
 30 / 35 / 40 seconds before the end,
depending on episode duration.

I changed it to trigger at 96% of playback instead, so the prompt appears when about 4% of the episode remains.

Patch idea:

1. Backup the file.

2. Replace the fallback timing logic:

 runtimeTicks-1e3*(fiftyMinuteTicks<=runtimeTicks?40:fortyMinuteTicks<=runtimeTicks?35:30)*1e4

with:

 runtimeTicks*.96

3. Optional but important:
Emby may use CreditsStart markers when available, so I also forced creditsInfo to 0 in the UpNext calculation to always use the percentage-based trigger.

4. Restart Emby.

5. Clear/reload the browser cache for:
 /web/videoosd/videoosd.js?v=4.9.5.0

In Chromium/Chrome DevTools console:

fetch('/web/videoosd/videoosd.js?v=4.9.5.0', {cache:'reload'})

Important notes:
- This is not an official setting.
- It will probably be overwritten by Emby updates.
- Backup before modifying.
- A proper UI setting would still be much better.

Result:
The UpNext prompt now appears around 96% of the episode instead of the hardcoded 30/35/40 seconds.