Again and again. Conversion failed. A required codec could not be found or failed to install

Server Version#: 1.15.8.1163
Player Version#:Web-Client Player

Hi,

I am using Linux Ubuntu 16.04. and I am running Plex on this systems for years now. Suddenly, two weeks ago, I am not able to play any Videos on my Client Devices (Web-Client as well as Fire-TV, Android Phone, iPhone). Furthermore, at the same time my Live TV & DVR is not working any more and my programmed records are lost.

I was trying to fix this problem with this forum and the internet, but I don’t get lucky since 2 weeks. When I look into my Logs I get these entries:

May 29, 2019 10:51:48.604 [0x7fe215ffb700] Fehlersuche — Auth: authenticated user 1 as XXXX
May 29, 2019 10:51:48.614 [0x7fe215ffb700] Fehlersuche — We're going to try to auto-select an audio stream for account 1.
May 29, 2019 10:51:48.614 [0x7fe215ffb700] Fehlersuche — Selecting best audio stream for part ID 17961 (autoselect: 1 language: de)
May 29, 2019 10:51:48.614 [0x7fe215ffb700] Fehlersuche — Audio Stream: 32297, Subtitle Stream: -1
May 29, 2019 10:51:48.616 [0x7fe215ffb700] Fehlersuche — Found session GUID of jsoipt2zis6a45q2jo3y8804 in session start.
May 29, 2019 10:51:48.616 [0x7fe215ffb700] Fehlersuche — Cleaning directory for session jsoipt2zis6a45q2jo3y8804 ()
May 29, 2019 10:51:48.617 [0x7fe215ffb700] Fehlersuche — Starting a transcode session jsoipt2zis6a45q2jo3y8804 at offset -1.0 (state=3)
May 29, 2019 10:51:48.617 [0x7fe215ffb700] Info — CodecManager: obtaining decoder 'h264'
May 29, 2019 10:51:48.618 [0x7fe215ffb700] Fehlersuche — HTTP requesting GET https://plex.tv/api/codecs/h264_decoder?build=linux-x86_64-standard&deviceId=c5e66bcf-4f28-4563-af45-252811cec8bf&oldestPreviousVersion=legacy&version=392df4f-2292
May 29, 2019 10:51:48.877 [0x7fe215ffb700] Fehlersuche — HTTP 200 response from GET https://plex.tv/api/codecs/h264_decoder?build=linux-x86_64-standard&deviceId=c5e66bcf-4f28-4563-af45-252811cec8bf&oldestPreviousVersion=legacy&version=392df4f-2292
May 29, 2019 10:51:48.878 [0x7fe215ffb700] Fehlersuche — HTTP requesting GET https://downloads.plex.tv/codecs/392df4f-2292/linux-x86_64-standard/libh264_decoder.so
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehler — Error issuing curl_easy_perform(handle): 6
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Warnung — HTTP error requesting GET https://downloads.plex.tv/codecs/392df4f-2292/linux-x86_64-standard/libh264_decoder.so (0, No error) (Could not resolve host: downloads.plex.tv)
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehler — Codecs: Download failed: Failed to download 'https://downloads.plex.tv/codecs/392df4f-2292/linux-x86_64-standard/libh264_decoder.so': -6
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehler — Error configuring transcoder: Decoder install failed: h264
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehlersuche — Streaming Resource: Terminating session 0x7fe25800cb80:b2soue4awu0ouwr9vcgd8iw0 which is using 1568kbps of WAN bandwidth.  Used is now 0kbps
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehlersuche — Streaming Resource: Terminating session 0x7fe25800cb80:b2soue4awu0ouwr9vcgd8iw0 which is using transcoder slot.  Used slots is now 0
May 29, 2019 10:51:49.002 [0x7fe215ffb700] Fehlersuche — Streaming Resource: Terminated session 0x7fe25800cb80:b2soue4awu0ouwr9vcgd8iw0 with reason Conversion failed. A required codec could not be found or failed to install.
May 29, 2019 10:51:49.002 [0x7fe266ffd700] Fehlersuche — Killing job.
May 29, 2019 10:51:49.002 [0x7fe266ffd700] Fehlersuche — Job was already killed, not killing again.
May 29, 2019 10:51:49.002 [0x7fe266ffd700] Fehlersuche — Stopping transcode session jsoipt2zis6a45q2jo3y8804
May 29, 2019 10:51:49.002 [0x7fe2719d6700] Fehlersuche — Cleaning directory for session jsoipt2zis6a45q2jo3y8804 (/tmp/Transcode/Sessions/plex-transcode-jsoipt2zis6a45q2jo3y8804-f16a5025-06ae-4ba2-afcc-4cf7086aeb90)
May 29, 2019 10:51:49.003 [0x7fe273fff700] Fehlersuche — Completed: [134.169.61.116:51116] 404 GET /video/:/transcode/universal/start.mpd?hasMDE=1&path=%2Flibrary%2Fmetadata%2F15598&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=1&subtitleSize=100&audioBoost=100&location=wan&maxVideoBitrate=2000&addDebugOverlay=0&autoAdjustQuality=0&directStreamAudio=1&mediaBufferSize=102400&session=jsoipt2zis6a45q2jo3y8804&subtitles=burn&Accept-Language=de (16 live) TLS GZIP 400ms 458 bytes (pipelined: 12)
May 29, 2019 10:51:49.003 [0x7fe266ffd700] Fehlersuche — Transcoder: Cleaning old transcode directories.

As I can see, Plex is trying to download the required codes, but it is not able to do so. Why? I am able to download this file directly. At the same time, when I am looking int othe directory

/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Codecs

I can find a directory, that was touched at the time of the LOG-File Entry:

drwxr-xr-x 2 plex plex 4096 Mai 29 10:51 392df4f-2292-linux-x86_64

But this directory is empty. Even if I chmod this directory to 777, this directory is touched again as the same time I am trying to play media. But nothing is downloaded. Furthermore, if I download this codec manually and place it within this directory, it is still not working.

Now I am clueless. I have a Plex Lifetime Pass, but I am not able to use this software, that’s a shame.

edit: Re-Install did not help as well.

Can anybody help me? Thanks in advance

Ok, now I am one step further.

I was wondering why I am not able to download needed codecs. Then I was searching for the meaning of error code 6 of libcurl.

The meaning is:

CURLE_COULDNT_RESOLVE_HOST (6)

Couldn't resolve host. The given remote host was not resolved.

So far. Then I typed into shell:
wget https://downloads.plex.tv/codecs/392df4f-2292/linux-x86_64-standard/libh264_decoder.so

Answer:

--2019-05-29 16:12:45--  https://downloads.plex.tv/codecs/392df4f-2292/linux-x86_64-standard/libh264_decoder.so
Auflösen des Hostnamen »downloads.plex.tv (downloads.plex.tv)«... fehlgeschlagen: Temporärer Fehler bei der Namensauflösung.
wget: kann die Host-Adresse »downloads.plex.tv« nicht auflösen

In English: Cannot resolve host. As the error mentioned.

Again, I tried: ping downloads.plex.tv

Answer:

ping: unknown host downloads.plex.tv

Then I tried: ping google.com

Answer:

PING google.com (216.58.205.238) 56(84) bytes of data.
64 bytes from fra15s24-in-f14.1e100.net (216.58.205.238): icmp_seq=1 ttl=50 time=19.4 ms
64 bytes from fra15s24-in-f14.1e100.net (216.58.205.238): icmp_seq=2 ttl=50 time=19.2 ms
64 bytes from fra15s24-in-f14.1e100.net (216.58.205.238): icmp_seq=3 ttl=50 time=19.1 ms
^C
--- google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 19.178/19.311/19.462/0.116 ms

Ok. So what is wrong? Obviously I am not able to contact downloads.plex.tv

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