Major performance issues when playing 4K content on Synology DS1621+ on last 2 versions of Plex Server

[tfilipovic]

Server Version#: 1.25.5.5492
Player Version#: Current Apple TV Player and directly over web connection to server on Windows laptop

The last 2 versions of Plex Server ( 1.25.5.5492 and 1.25.4.####) have caused the CPU to spike to over 95% on my NAS device whenever playing 4K content. 1080p content plays without any problems. On laptop via web browser will allow the video to generally play, but when playing on Apple TV Player, the video will play for 2 - 5 minutes then pause while the video transcoder catches up and buffers enough to keep playing.

Is this a known issue or is there something else going on with my device. This didn’t happen before these last 2 versions.

I am attaching logs.
debug log.txt (79.2 KB)

[ChuckPa]

Those are unfortunately the plex/web logs and of no help here.

Please recreate the problem then

Settings - Server - Troubleshooting (lower left corner of Plex/web) - Download logs.

Attach the ZIP file it gives you , please.

[tfilipovic]

Here is a screenshot of the CPU during playback of 4k content:

Here is the image after playback is stopped:

Here are the attached logs. Sorry for sending the incorrect ones the first time.
Plex Media Server Logs_2022-02-12_13-58-42.zip (3.0 MB)

Logs were downloaded before playback was stopped. If I need to get the logs after playback is stopped, let me know and I will recreate and provide.

[ChuckPa]

Thanks for the logs.

Your NAS CPU is a Ryzen.

Feb 11, 2022 07:10:53.075 [0x7fd6e26bcb38] INFO - Plex Media Server v1.25.5.5492-12f6b8c83 - Synology DS1621+ x86_64 - build: linux-x86_64 synology-dsm7 - GMT -05:00
Feb 11, 2022 07:10:53.075 [0x7fd6e26bcb38] INFO - Linux version: DSM 7.0.1.42218-2, language: en-US
Feb 11, 2022 07:10:53.075 [0x7fd6e26bcb38] INFO - Processor: 8-core AMD Ryzen Embedded V1500B                      
Feb 11, 2022 07:10:53.075 [0x7fd6e26bcb38] INFO - Compiler is - Clang 11.0.1 (https://plex.tv b587490162c22e078c314e3f7dc560c691d126aa)
Feb 11, 2022 07:10:53.075 [0x7fd6e26bcb38] INFO - /volume1/@appstore/PlexMediaServer/Plex Media Server

Engineering has not yet created any HW transcoding support for AMD.

The best you can hope for is DirectPlay or DirectStream (audio conversion) but this will mean you need to carefully curate your media and avoid burning in subtitles (PGS, VOBSUB, or DVDRIP type) as well as attempting to transcode HEVC

[tfilipovic]

Thank you for the quick response, but I find it odd that versions before the last two (1.25.3.#### and older I am guessing) didn’t cause this behaviour as I have been running plex server on this device since November without issues. Before that I was running Plex Server on Unraid with a Ryzen 3 processor as well without issues. I haven’t changed any settings but if there are any recommendations you can make on which settings I should enable or disable, I would appreciate it.