Get rid of double transcoding

[igor-epam]

telly release with the issue:

telly --version
telly, version 1.1.0.8 (branch: dev, revision: 96424a4)
build user: root@7abd9a6a6502
build date: 20200704-05:28:02
go version: go1.12.17

Last working telly release (if known):
NA

Operating environment (Docker/Windows/Linux/QNAP, etc.):

Docker is created using the following dockerfile. It's 'custom' as there is no arm64 docker image available.
Dockerfile.txt

Description of problem:
The local Plex instance is configured not to transcode the video stream. On attempt to play any channel, there is a message "Playback error. Source is unavailable". When the transcode option is set, the video is transcoded by plex. Thus, there is double transcoding: one on the telly and another on the plex sides.
Is it possible to make a stream Direct-streamable for plex to not have double transcoding?

Contents of telly.config.toml [if you're using a version above 1.1]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

FFMpeg = true   is set, 
Despite this, the only IP address is set and m3u, epg addresses. IPTV is not free, so can not provide the full link as it's personalized. https://   cbilling.eu/ provider.

Command line used to run telly [if applicable]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

Docker run command used to run telly [if applicable]:

• REMEMBER TO DELETE ANY CREDENTIALS IN CONFIG FILES OR COMMAND LINES

docker-compose up -d
see dockerfile for additional information

telly or docker log:

[plex.log](https://github.com/tellytv/telly/files/10203352/plex.log)
[telly.log](https://github.com/tellytv/telly/files/10203353/telly.log)

Additional information: