How to avoid transcoding while watching live tv?

Live TV & DVR
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Server Version#: 1.19.5.3112
Player Version#: 8.5.1.19778
Tuner Make/Model: HD Homerun duo

My nvidia shield tv 2017 is directly connected to my tv and support only stéréo.

When I watch tv it always transcode because of the AC3 that is not supported by my tv. I have to manually each time to change audio AC3 5.1 to AC3 stereo to direct play. Is there a way to set that by default?

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Log from my plex client

08-31 19:31:46.936 i: [DefaultPlaybackManager] Ignoring passthrough, since we’ve prompted previously.
08-31 19:31:46.940 i: [PlaybackManager] Audio codec required: ac3
08-31 19:31:46.941 i: [DefaultPlaybackManager] Playback possible, downloading codecs…
08-31 19:31:46.942 i: [CodecManager] Attempting to download: ac3
08-31 19:31:46.943 i: Fetching [method:POST] http://127.0.0.1:32500/services/codecs/decoder/ac3?includeExternalMedia=1
08-31 19:31:46.947 i: [pms] /127.0.0.1:43912 - POST /services/codecs/decoder/ac3
08-31 19:31:46.952 e: Error parsing XML from http://127.0.0.1:32500/services/codecs/decoder/ac3: Unexpected end of document
08-31 19:31:46.953 e: [CodecManager] Unknown return code (0)
08-31 19:31:46.953 i: [DefaultPlaybackManager] Codec failed to downloading, continuing…
08-31 19:31:46.957 i: [ConnectivityManager] Device is under Ethernet
08-31 19:31:46.984 i: [Player][ExoPlayer] Using PlayQueueMediaSource
08-31 19:31:46.985 i: [MediaCodecVideoSyncRenderer] Setting block output buffer: false
08-31 19:31:46.986 i: [MediaCodecVideoSyncRenderer] Setting allow dummy surface: true
08-31 19:31:46.986 i: [ExoPlayer][EventLogger] state [2.28, 0.00, window=0, false, BUFFERING]
08-31 19:31:46.987 i: [LiveScheduleBehaviour] Fetching timeline data…

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Please plex staff! Consider adding the choice to set stereo or 5.1 by default to avoid transcoding!

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