Jellyfin on LG 55C6V: Remuxing Instead of Direct Play

[kitopopo]

I have an LG 55C6V, and Jellyfin performs remuxing (container conversion) on most movies, even when the TV supports the video and audio formats.

Observed Behavior:

Jellyfin converts most movies to HLS, even if the original file is MKV.

Plex plays in "Direct Play" mode without remuxing or transcoding on this same TV.

When played from a USB drive, the TV handles all files without issues (MKV, H264, H265, DTS, AC3, etc.).

On a newer LG TV, Jellyfin performs "Direct Play" without remuxing or transcoding.

If I disable remuxing in Jellyfin, playback fails on this TV.

I have tried changing client settings, but the issue persists.

The movie initially starts in Direct Play mode for about 10 seconds, but then Jellyfin switches to remuxing, which takes another 10 seconds to start processing.


Example of Jellyfin log:

Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)

Output #0, hls, to '/var/cache/jellyfin/transcodes/xxxxxx.m3u8':
  Metadata:
    encoder        : Lavf61.1.100
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24 fps, 24 tbr, 90k tbn (default)
  Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)

The TV natively supports MKV, yet Jellyfin still converts it to HLS, causing unnecessary CPU/disk usage.

Questions:

1. Why does Jellyfin remux on this TV but not on the other one?


2. How can I force Jellyfin to use "Direct Play" on the LG 55C6V?


3. Is this an issue with client profile detection?

Thanks to the Jellyfin team for their hard work and dedicationit's a great project! I hope someone can help me.

Thanks, best regards.

[TheDreadPirate]

1. Different versions of WebOS?

2. You probably can't. Keep in mind that Plex uses their own playback engine while Jellyfin uses the WebOS playback engine. When you connected your USB drive to the TV, that likely also used a different player than the one built into WebOS.

3. Possible. But also maybe not.

[kitopopo]

1. Different versions of WebOS?
Yes, the LG 55C6V has WebOS 2.0 or possibly 2.5, while the other LG has WebOS 5.0.


2. Probably not.
When Plex uses "Direct Play", it doesn't use its own playback engine but rather the WebOS playback engine, just like when playing content from a USB drive. Therefore, the behavior of Plex and Jellyfin should be similar in this regard, but Jellyfin seems to have an issue that causes remuxing instead of direct playback.



Some of the movies are old, with outdated codecs instead of modern ones. The LG 55C6V TV is capable of playing everything, but Jellyfin performs remuxing without reason, and this is not correct. I’ve checked that the problem is with Jellyfin since the movies play fine via DLNA. It might be helpful if the developers could check several playback logs to pinpoint the cause of the unnecessary remuxing.