Playback loops when transcoding on Android Client

[jordiep23]

Server Info- TrueNAS Scale 25.04.1 with Jellyfin 10.10.7.

Client Info- Android Client 2.6.3

Playback is stuck in a 3 second loop when trying to transcode at 1.5Mbps on my Android phone. The video plays for 3 seconds and displays the videos loading image before resuming for 3 seconds.
This issue persists once transcoding has reached 100%.
The issue occurs on local network and 'remote' access via Tailscale
Occurs on all videos.
Direct play and other quality bitrates do not produce this issue.
This issue does not occur when using Jellyfin Media Player 1.12.0 on Windows with the same file and transcode quality.

I have successfully transcoded to 1.5Mbps using this client before. 

I have tried Positive Power Interuption on the server and client.

I have attached the transcode log. 
  Transcode 1.5MbpsLoop.txt (Size: 84.04 KB / Downloads: 5)

Any thoughts on this would be appreciated.

[seemebreakthis]

Same here. Things were ok before.

Exact same symptoms. Problem with android clients only.

[Bladefin]

I had noticed this on Tuesday with the web player it loops every 3 seconds so never actually playing the film.

[seemebreakthis]

I did some more testing and it seems the client player on my Android phone just keeps storing transcoded data which makes the buffer grow uncontrolled, until the old data that gets deleted actually reaches the current playback location, at which point playback is interrupted and then starts over from the beginning of the video.

This is only my conjecture, but it does seem when the buffered data grows to a certain extent, as can be seen in my playback timeline, the playback gets interrupted.

Seems the web player client doesn't know how to tell the server to pause transcoding as the buffer is getting filled up.

Funny thing is, on another Android phone running the exact same version of the Jellyfin client, this problem doesn't show. That phone seems to be able to tell the server to throttle transcodes properly, and the timeline shows buffering to stop growing after it gets far ahead enough. So the problem only manifests itself on my main phone.

[nyanmisaka]

Chrome 138 regression, fixed in: https://github.com/jellyfin/jellyfin-web/pull/6985