FWIW I also had this issue and was able to fix it by resetting the permissions on my transcode folder.
chown -R plex:users /path/to/transcode
chmod -R 777 /path/to/transcode
Please do not put 777 permissions on anything.
Look at the owner of the directory.
ls -al /path/to/transcode
My issue was I was not the owner. The permissions were OK.
chown -R user:group /path/to/transcode
This has been happening to me for over a month. Attached are my logs. I am on the current version. Version 1.16.1.1246. It is random, different devices in the same house. some work, others dont. 1 Ipad works, other does not. I have uninstalled, reinstalled. Installed on a new drive and all still the same. Doesnt matter if its transcoding off my cpu, or off my P2000 GPU the same people on the same devices have the same issues. I even had them uninstall and reinstall.
Server Specs
Ryzen 2700
Asus ROG STRIX B350-F
32gb ddr4 ram
UNRAID OS
has been installed on 1tb NVME, 1tb SSD Samsung EVO, 8tb Seagate Iron wolf and 4tb WD Red. All with same outcomes
Hope someone can helpPlex Media Server Logs_2019-07-01_02-43-56.zip (5.7 MB)
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I have had the same problem for a long time and havenāt been able to find a solution or get any help here on this forum.
My PMS ( Version 3.106.2) runs on a Qnap TS 253 Be NAS (Firmware 4.4.1.0978). Both have been updated regularly but the problem persists.
Could someone please take a look at my log files to see where the problem lies?
Plex Media Server Logs_2019-07-07_15-06-03.zip (4.9 MB)
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what frustrates me the most being a Plex pass Purchaser, is that there are so many people having this exact same issue and after reading through the comments, the response from a Team member is that they need people to provide info on the issue so they can figure it outā¦ well hey I see 446 comments to this threadā¦ and im sure its been posted 100s if not 1000s of times in other threads and it has not been fixed, let alone even brought up in any change logs. Its very frustrating to be a purchaser of a product only to have it ā¦Kinda work ā¦ and have the development team seem to have no interest in figuring out / fixing the issue. ā¦ Rant overā¦
This has recently started happening on a few movies on my QNAP Plex Server instance. It only seems to happen on certain movies and usually at the beginning. Iām not sure how to provide logs. If someone can let me know how, I will.
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
Depending on review, samples may be asked for also. Wait until prompted.
Most of these are different. It is a generic error message for any transcoder failure. So each case needs to be investigated with logs and sample. Sometimes one cause is identified that is seen to affect many users - eg the change in MalwareBytes Premium which caused the transcoder to fail
Looking at the logs which cover a 50 minute period, i cannot see a transcoder exit due to an error
I can see transcoder jobs being run whilst playing back and seeking āAlita Battle Angel (2019)ā
Jul 01, 2019 02:39:10.189 [0x14f142df6700] DEBUG - Transcode Session: Going to restart at offset 3714.005615 with segment number 1238
Jul 01, 2019 02:40:24.935 [0x14f1582c8700] DEBUG - Transcode Session: Going to restart at offset 3789.039062 with segment number 1263
Jul 01, 2019 02:41:34.207 [0x14f1437fb700] DEBUG - Transcode Session: Going to restart at offset 3858.024658 with segment number 1286
Jul 01, 2019 02:42:40.202 [0x14f1427f3700] DEBUG - Transcode Session: Going to restart at offset 3924.007324 with segment number 1308
Jul 01, 2019 02:43:46.273 [0x14f1582c8700] DEBUG - Transcode Session: Going to restart at offset 3990.031738 with segment number 1330
These were for skips during playback for the Alita Battle Angel video
There were no transcoder failures that I can see within the 50 minute period covered by the logs
Please in future give the time of failure and what was being played back when providing logs
The transcoder reported errors appear to be when playing back trailers. where it is reporting that it is encountering invalid data.
This can easily arise if the system clock on the server is wrong as the interface to the providers that supply the trailers rely on accurate time and authorization for access is time limited
See the section on System Time on this article https://support.plex.tv/articles/202819366-why-won-t-trailers-or-extras-play/
(At this moment this is only a guess)
Brilliant tip!
My Qnap NAS was set to manual time adjustment and was almost 5 minutes off. Setting it to automatic time update solved the problem 
Thank you so much!
I would never have been able to figure this out myself 
The solution is that it doesnāt work, get lost. Thatās all I see from the Plex community.
Why is logging so terrible with plex? Hereās an idea Iād like to criticize- plex optimize. Itās garbage and never works.
I had this same issue and got it sorted. Can you please do me a favor and troubleshoot it with me?
1- u in docker or not? If not in docker, I have a strong recomendation for it.
2- can you ls -alsh inside and outside of your transcode directory? it needs to be owned by users, and permissioned 755. https://i.imgur.com/ULdDDyD.png see how my /transcode directory is owned by abc in the usergroup abc? Thats just because its docker and that is the default user. The important part is that it is owned by something that can write to it and be chmodded to be able to be written. This is SUPER common of a problem in linux.
The second issue it could be is your ffmpeg. That is the library used to transcode. If you have a bugged or out of date one, then it will throw errors. Malformed media will also throw errors. You can try a diffrent format or use ffprobe to scan for errors in the title. (btw docker has an internal version it installs, and thats why i recommend using it)
Please, ill help you. someone helped me with this issue and ill help u diagnose.
Hello, I have problems playing IPtv.blunde, I get a message āI can go to the photo and look for a solutionā, I commented that I have uploaded it by filezilla, since I have vps, and I canāt make it play, but my other movies play normal , now I have just bought plex pass and still I canāt make it work, can someone please help me.
Youāll need to start by asking the bundle developer for support.
https://forums.plex.tv/c/third-party/plugins
Once the developer determines the issue, they can go from there.
This topic is only for support of a specific error.
Plugins are no longer supported in Plex.
im having the same issue on all my android devices
Plex Media Server.log (761.6 KB)
I am having same issue.
OS: MacOS
Plex Server Version: 1.18.1.1973
Error Message: Play Back Error, Conversion failed. The transcoder exited due to an error.
Plex Client: iPhone iOS 13.2, Web Client on Safari.
I am having same issue.
OS: MacOS
Plex Server Version: 1.18.1.1973
Error Message: Play Back Error, Conversion failed. The transcoder exited due to an error.
Plex Client: iPhone iOS 13.2, Web Client on Safari.
Same issue here on some video formats. Same version, but Linux server.
You may have found the problem yourself by now - the log shows the file does not exist
Oct 21, 2019 22:45:27.495 [4432] ERROR - Couldn't find the file to stream: E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv
Oct 21, 2019 22:45:27.495 [2704] DEBUG - Completed: [127.0.0.1:50309] 404 GET /library/parts/13457163/1571401492/file.mkv (25 live) 1ms 240 bytes (range: bytes=0-)
Oct 21, 2019 22:45:27.496 [16052] ERROR - [Transcoder] http://127.0.0.1:32400/library/parts/13457163/1571401492/file.mkv?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx: Server returned 404 Not Found
Oct 21, 2019 22:45:27.520 [8648] DEBUG - Jobs: 'C:\Program Files (x86)\Plex\Plex Media Server\Plex Transcoder.exe' exit code for process 15372 is 1 (failure)
Oct 21, 2019 22:45:27.521 [6240] DEBUG - Streaming Resource: Terminated session 0xa782088:8b28fb8297c2bcfb-com-plexapp-android with reason Conversion failed. The transcoder exited due to an error.
The log shows several errors relating to files not found
2161 Oct 21, 2019 22:45:15.832 [16052] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv"' - No such file or directory (2)
2162 Oct 21, 2019 22:45:15.832 [16052] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.720p.HDTV.x264-AVS[rarbg]\Young.Sheldon.S03E04.720p.HDTV.x264-AVS.mkv"' - No such file or directory (2)
2226 Oct 21, 2019 22:45:20.364 [16184] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv"' - No such file or directory (2)
2227 Oct 21, 2019 22:45:20.365 [16184] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.720p.HDTV.x264-AVS[rarbg]\Young.Sheldon.S03E04.720p.HDTV.x264-AVS.mkv"' - No such file or directory (2)
2377 Oct 21, 2019 22:45:21.085 [16052] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv"' - No such file or directory (2)
2378 Oct 21, 2019 22:45:21.085 [16052] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.720p.HDTV.x264-AVS[rarbg]\Young.Sheldon.S03E04.720p.HDTV.x264-AVS.mkv"' - No such file or directory (2)
2489 Oct 21, 2019 22:45:22.147 [16052] ERROR - Couldn't find the file to stream: E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv
2493 Oct 21, 2019 22:45:25.177 [9832] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv"' - No such file or directory (2)
2494 Oct 21, 2019 22:45:25.177 [9832] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.720p.HDTV.x264-AVS[rarbg]\Young.Sheldon.S03E04.720p.HDTV.x264-AVS.mkv"' - No such file or directory (2)
2620 Oct 21, 2019 22:45:26.564 [4432] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS[rarbg]\Young.Sheldon.S03E04.1080p.HDTV.x264-CRAVERS.mkv"' - No such file or directory (2)
2621 Oct 21, 2019 22:45:26.565 [4432] ERROR - Error opening file '"E:\TV Shows\Young.Sheldon.S03E04.720p.HDTV.x264-AVS[rarbg]\Young.Sheldon.S03E04.720p.HDTV.x264-AVS.mkv"' - No such file or directory (2)
Has the drive letter perhaps changed ? You can use compmgmt to fix the drive letter - if this is an external drive
