Server Version#: 1.19.5.2889-52a517a93 (and older) FreeNAS. FreeBSD version manually installed in a jail. TLDR: I think Plex Transcoder is being unnecessarily throttled by PMS when processing background media tasks. I modified the Transcoder binary to test this theory, with great results. Generat…

1.19.4.2935, optimization/preview/intro jobs aren’t permanently throttled any more. Nice. I’ll split my comments about optimizer job settings to another thread. I found other optimizer job settings that don’t work at all, too.

This is a very detailed report :smiley: thanks for doing most of the work :slight_smile: I wonder does this happen if you restart the server and make sure no one is streaming/syncing etc? We do set canThrottle to 1 but it seems to be as part of Automatically adjust quality only (not 100% sure need…

To follow up, all of my Thumbnail/Preview/Index generation finished last night. Intro Detection did too. (Is it Chromaprint? I bet it’s Chromaprint.) Automatically adjust quality is a client playback setting, isn’t it? Other than bandwidth, does that use information from the server? I restarted th…

Yeah its a client setting but I was just saying “this is the only place I seem to see it explicitly set to 1” We might have other cases, but we do need a PMS dev to confirm, this can be set just in general to background task (or processing on media added) so we avoid making actually playback transc…

BTW I though I had asked but clearly not, can you post the PMS logs while this is throttled? they might indicate why.

This is directly related to the Disable video stream transcoding setting. It appears to have the side effect of throttling all Plex Transcoder workers, including those doing optimization, thumbnail generation, and intro detection. With Disable video stream transcoding unchecked, when a media optimi…

Per comments in another thread, a fix may be on the way. [image] New Skip Intro Function Taking Hours To Finish Only One Season Plex Media Server I have a fix for the “24 hours / season” landing in the next release (1.19.5) For now, unchecking the “Disable video stream t…

I started to experiment with using Plex to Optimize some of my media. Disable video stream transcoding also silently changes optimization job settings. They can still be initiated and are processed. Audio is transcoded if necessary. Video is copied and remuxed, but not transcoded. In all fairness,…

Same for download jobs - video quality settings are silently ignored. The jobs are accepted, audio is transcoded. Video is remuxed but not transcoded. Files are downloaded. “Wow, 200Kbps video looks remarkably good. I don’t think it lost any quality at all. Wow.” “…” “Wait a minute …”

HAH, wait, no. It’s weirder than that. For optimization and download jobs, the impact of Disable video stream transcoding depends on the original video codec. When the source video is h264, Disable video stream transcoding causes the video transcoding settings to be silently ignored. Regardless of …

[image] Quality chosen for Sync and Optimizer ignored Plex Media Server Server Version#: 1.19.4.2935, 1.19.5.2916 When Disable video stream transcoding is checked, video stream bitrate and video dimension target settings can be ignored by the Optimizer. This means that o…

Transcoder background tasks being throttled

Plex Media Server

Volts June 9, 2020, 9:52pm 9

Per comments in another thread, a fix may be on the way.

Topic		Replies	Views
Explain this image [TRANSODER/SYNC BUG] - FIXED in 0.9.17.3 General Discussions	61	266	January 7, 2020
Transcoding Throttle Removal Problems - An Example Plex Pass Betas server-linux , samsung-tizen	49	3201	June 18, 2025
Plex seems to transcode entire episodes or movies in 1 go instead of transcoding only when required General Discussions	99	601	January 7, 2020
How to disable transcoding? General Discussions	105	90934	September 14, 2020
Disable Plex Transcoder Totally General Discussions subtitles	323	50536	January 7, 2020

Transcoder background tasks being throttled

Related topics