Update from this morning entry - just played another programme this afternoon, and guess what - buffering problem is back again - so basically given what other users are saying - this fix is not working! So ‘hardware accelerator’ is switched off again.
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Just found this thread after having the problem for ages. I haven’t seen much Qnap specific talk, I have the TS-453be. I’ll try to find the time to try patched link here later tonight to see how it goes.
Can those users seeing the broken-up image (looks titled behind the subtitles) please install build 1.18.4.2155 (I have updated the links in this post) they fix an issue where it would only Hardware decode and not encode (A new pref was disabled by default and this has been corrected)
Note: you will likely still get pixelation for the first 30-60 seconds of a transcode which is a separate issue we are tracking.
To help everyone, here’s a link to the post where @chrisallen has posted the builds he mentioned: Hardware Transcoding broken when burning subtitles ApolloLake-based Synology NASes
FYI: this build (2155) has a bug in the postinstall script from this package:
if plex is running inside a container, the line ‘udevadm control --reload-rules’ will always return error code 2, even if this one is completly useless inside a container. this will let the installation fail without any error printed.
… also it’s still not fixed. same image when enabling subtitles as i reported before
This build 2155 - actually breaks PMS on my Ubuntu, had to uninstall and install latest build from Public (1.18.2.2158) manually in order to get PMS back. Now when transcoding is enabled it just circles on the screen and nothing is displayed, so disabled hardware transcoding, now able to playback, but CPU is in the 90% range! It seems to be getting worse not better!
QNAP 453Be here. I had the same problem but with the 1.18.4.2155 build everything now works fine! Thanks!
I can’t follow it anymore. So many incomprehensible terms pass by. I have this configuration and what should I do now to ensure that I can play a movie normally, so without pixelation, without having to turn off the subtitles? Please give a clear and clear answer, because I am not at all familiar with this matter.
Configuration:
Synology DS218 + with DSM 6.2.2-24922 Update 4 and I am running the latest version of the Plex Server software 1.18.2.2058.
Can confirm that version 1.18.4.2155 on a Synology DS918+ fixed the problem. Used in combination with latest Android TV Plex client.
No longer a scrambled image with subtitles enabled. Works without problems on the new player as well for both direct play and HW transcoding.
as far as i know - you cant. The newer versions seems to just use the older version of the encoder, which has this nasty pixelation bug and - in general - has very poor transcoding quality. The new decoder has the bug with subtitles…
soooo… you have to choose which poison fits you best… 
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@chrisallen
Is there any progress with the pixalisation the first 30-90 sec?
Your TestPMS works good except the pixalisation.
best regards
Ekomax
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On 918+ I’m having the pixelation for the first 60 90 seconds whenever hw transcoding is enabled with any version of the plex media server later than the one in the package center
Hi,
I just tried the 1.18.4.2155 and I am getting a nice video with subtitles. Hope for a steady version soon.
PMS: Synology 918+
Client: web
With kind regards,
Hello,
I just got the update notice for 1.18.3.2156. The question is: is this problem fixed in this release? The release notes make no mention at all of this bugfix, and I really don’t want to install the new release “blind”.
I’m still on 1.18.0.1944, which luckily I kept when this HW transcoder issue saga started.
Still broken. First reported problem was October 25th it would be nice if Plex could actually fix something a little bit quicker
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still broken on what version?
see @ Plex Media Server
2156 the one just released
1.18.4.2164 is the one just released.
Sorry you are correct. 2164 is broken
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I confirm that on Plex 2164 build, I have DVR “transcoding” experimental option checked and “hardware accelerated video encoding” checked in “transcoding” settings and Plex does NOT use GPU to encode when DVR recording (CPU usage is cranked up). This is on Synology 1019+.
I can use a DVR post-processing script that calls FFMPEG to encode to both h.264 and h.265 formats using hardware accelerated encoding on the Synology box (I can tell because CPU usage shows low during encoding with this method).
