Migrated from Windows to Synology DS418+ Server - Trouble with Buffering

Plex Media Server NAS & Devices
1

Server Version#: 1.21.1.3830
Player Version#: Amazon Fire TV Stick 4K - 8.11.0.22186

I’ve been using the same NAS as the data store for Plex for a long time, but had been using a Windows machine as the server. It has worked perfectly but I am trying to get the same thing running on the Synology NAS now so that I don’t need to keep the computer on at all times.

I’ve been able to transfer the libraries with no issues.

The problem is that I am getting bad buffering even when no transcoding is being used.

I’ve attached the logs in case it helps.

(File removed)

2

It’s stuttering / buffering bause there is no hardware acceleration being used.

Jan 03, 2021 11:43:29.065 [0x7fed1adf7700] DEBUG - [Universal] Using local file path instead of URL: /volume1/video/TV/Shameless/Season 04/Shameless - s04e02.mkv
Jan 03, 2021 11:43:29.066 [0x7fed1adf7700] DEBUG - TPU: hardware transcoding: final decoder: , final encoder: 
Jan 03, 2021 11:43:29.068 [0x7fed1adf7700] DEBUG - Job running: EAE_ROOT='/volume1/Plex/tmp_transcoding/pms-814083c2-949c-43ed-abed-7b4554ce1867/EasyAudioEncoder' FFMPEG_EXTERNAL_LIBS='/volume1/Plex/Library/Application\ Support/Plex\ Media\ Server/Codecs/367b3d4-3654-linux-x86_64/' XDG_CACHE_HOME='/volume1/Plex/Library/Application Support/Plex Media Server/Cache' XDG_DATA_HOME='/volume1/@appstore/Plex Media Server/Resources' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/volume1/@appstore/Plex Media Server/Plex Transcoder' '-codec:1' 'dca' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/volume1/video/TV/Shameless/Season 04/Shameless - s04e02.mkv' '-filter_complex' '[0:1] aresample=async=1:ocl='\''5.1'\'':rematrix_maxval=0.000000dB:osr=48000[0]' '-map' '[0]' '-metadata:s:0' 'language=eng' '-codec:0' 'flac' '-b:0' '4096k' '-f' 'flac' '-map_metadata' '-1' '-map_chapters' '-1' '-t' '1477.328' '/volume1/Plex/Library/Application Support/Plex Media Server/Cache/Transcode/Detection/e8e9eb64-9e8e-49b5-ac4b-c5e88ae839ad' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/dbaa2a07-e8f4-470a-9672-0b77f780cad7/5ea1a997-e2fa-41a9-bc98-02e118932f40/progress'
Jan 03, 2021 11:43:29.069 [0x7fed1adf7700] DEBUG - Jobs: Starting child process with pid 30960

If you are using subtitles, make certain they are text-based and the player is not set to “Burn Always”

If you are not using HW acceleration, you may enable it in Settings - Server - Transcoder - Show Advanced.

3

I have hw transcoder enabled. It shows that hw transcoding is in-use in the dashboard:

4K (HEVC Main 10 HDR) (hw)

4K (H264)—Transcode (hw)

4

Also, if I change the audio format to DD 5.1, the dashboard shows direct play for both video and audio - but I still get the buffering.

5

Looks like the processor in this NAS won’t handle 10-bit HEVC. It’s too bad that Plex couldn’t identify this and remove the (hw) tag from the dashboard status.

6

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