Hi,
Recently I noticed that my DS418Play would not hardware transcode while watching on my windows pc. It has been working flawlessly until now.
Things I have tried:
Use hardware acceleration when available - Ticked
Reinstalled Plex Server 64bit - Version 1.13.2.5142
Removed Plex completely
Upgraded to the DSM 6.2 Beta
But still no luck.
I have Plex Pass.
I have attached a XML file and server log.
Uninstall the PMS package and reinstall
ANY DSM update will erase the permission rules I install. The installer silently writes those rules during installation.
The next PMS major release won’t require uninstall/reinstall of the package… A simple Stop/Start will perform the same step for you
Hi ChuckPA,
Sorry if I wasn’t clear, I have already tried this and still no luck. I am aware of this issue as I have done this in the past for previous updates and this would usually fix it.
If you will recreate it, capture the DEBUG log files, attach the XML and logs, I will look at it. Synology doesn’t “just break” on my watch 
ChuckPa thank you for the prompt reply. See attached a different file but same outcome.
Also ive tested Synology Video Station which transcoding is still working on a 4k HVEC fine but no way im using that!
There are a number of things wrong here.
1 DSM 6.2 Beta
I do not yet have a DSM 6.2 box.
You’ve installed Beta which is known to cause problems. In this case, as seen by others, /dev/dri/renderD128 is not seen. Your logs show this.
DSM is in full release now https://www.synology.com/en-global/support/download/DS418play#utilities and try again.
Jun 08, 2018 19:55:45.907 [0x7f68931e9700] DEBUG - Codecs: hardware transcoding: testing API vaapi
Jun 08, 2018 19:55:45.908 [0x7f68931e9700] ERROR - [FFMPEG] - No VA display found for device: /dev/dri/renderD128.
Jun 08, 2018 19:55:45.908 [0x7f68931e9700] DEBUG - Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Invalid argument
Jun 08, 2018 19:55:45.908 [0x7f68931e9700] DEBUG - Scaled up video bitrate to 10152Kbps based on 4.500000x fudge factor.
2 Conflicting XML
There is something wrong with the header in this file.
It declares BT709 colorspace (8 bit) but then calls out HDR (10 bit) aka “Main 10”. Proper 8-bit (bt709) is profile “Main”
<Stream id="4897" streamType="1" default="1" codec="hevc" index="0" bitrate="8601" bitDepth="10" chromaSubsampling="4:2:0" colorPrimaries="bt709" colorRange="tv" colorSpace="bt709" colorTrc="bt709" frameRate="23.976" height="800" level="120" profile="main 10" refFrames="1"
Can you get me a sample of it? 10-15 MB? https://support.plex.tv/articles/201035968-generating-sample-files-from-media (Syno command line has dd which works perfect)
@mancsandancer said:
Also ive tested Synology Video Station which transcoding is still working on a 4k HVEC fine but no way im using that!
Synology’s Video Station conflicts with PMS. You can have one or the other. If it’s running, PMS can’t. Synology uses both their proprietary processor and the GPU for transcoding.
Stop Video Station and retest
I just logged into the the NAS Lab. I can’t get DSM 6.2 through their distribution mechanism. This, coupled with my not yet receiving the official notification, and coupled with it having been announced as RC https://forum.synology.com/enu/viewtopic.php?t=142240 , all tell me you’re sitting in that precarious position I can’t support yet.
I suspect you manually downloaded DSM 6.2 beta/RC and manually installed it?
Can you get back on DSM 6.1.7 ?
ChuckPa I will reset the DSM and install 6.1.7 and get back to you.
Good news.
I reset the Synology drive but was unable to go back to 6.1.7 so reinstalled 6.2 but the transcoding is working fine including the second video file xml I sent (3 transcodes in fact).
If you need any further details or logs I am happy to send if it helps.
If HW works for other files but not one, you have a file issue.
If the problematic file is the one I pointed out, the reasons I’ve highlighted are why. The TL;DR of why is “Impossible header / content combination”
I have taken DSM 6.2 RC and loaded it on the lab NAS.
Hardware transcoding is fully functional:
sh-4.3# cd /dev/dri
sh-4.3# ls -la
total 0
drwxr-xr-x 2 root root 100 Jun 8 14:13 .
drwxr-xr-x 13 root root 18820 Jun 8 14:13 ..
crw-rw---- 1 root video 226, 0 Jun 8 14:15 card0
crw-rw---- 1 root video 226, 64 Jun 8 14:15 controlD64
crw-rw---- 1 root video 226, 128 Jun 8 14:15 renderD128
sh-4.3# uname -a
Linux Syno-DS716Plus 3.10.105 #23739 SMP Sat May 19 03:19:50 CST 2018 x86_64 GNU/Linux synology_braswell_716+
sh-4.3# grep plex /etc/group
administrators:x:101:admin,plex
video:x:65545:plex
sh-4.3# hostname
Syno-DS716Plus
sh-4.3#
Since reinstalling the DSM 6.2 all the files transcode fine including both examples I posted. Thank you for the help.
OUTSTANDING!
FYI… You’re running DSM 6.2 RC … I do not have information on when DSM 6.2 Final will be released. They could have DSM 6.2 RC 2 so keep your eyes open
Noted thanks will turn off auto update just in case it updates . Will wait to make sure you have tested the final 6.2 release before I update. Thanks again and have a nice weekend.
You too. Have a great weekend 
