I am having the same problem.
Happy to provide any additional logs or info that I can, to help determine why this is happening:
Server: Synology NAS - DS916+ - 1.28.0.5998
TV: LG CX - 5.4.1-10 (jhericurl-jebil)
Plex on LG CX - 5.43.1
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] [MDE] Application decision, directPlay: false, directStreamVideo: false, directStreamAudio: true
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Cannot direct play with protocol: http, codec: hevc. Reason: Dolby Vision Profile 5 is not supported
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Cannot direct stream with protocol: hls, codec: hevc. Reason: Dolby Vision Profile 5 is not supported
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] videoStream: {
"id": 513291,
"streamType": 1,
"default": true,
"codec": "hevc",
"index": 0,
"bitrate": 24428,
"DOVIBLCompatID": 0,
"DOVIBLPresent": true,
"DOVIELPresent": false,
"DOVILevel": 6,
"DOVIPresent": true,
"DOVIProfile": 5,
"DOVIRPUPresent": true,
"DOVIVersion": "1.0",
"bitDepth": 10,
"chromaLocation": "left",
"chromaSubsampling": "4:2:0",
"codecID": "dvhe",
"codedHeight": 1920,
"codedWidth": 3840,
"colorRange": "tv",
"frameRate": 23.976,
"height": 1920,
"level": 150,
"profile": "main 10",
"refFrames": 1,
"streamIdentifier": "1",
"width": 3840,
"displayTitle": "4K DoVi (HEVC Main 10)",
"extendedDisplayTitle": "4K DoVi (HEVC Main 10)"
}
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] audioStream: {
"id": 513292,
"streamType": 2,
"selected": true,
"default": true,
"codec": "eac3",
"index": 1,
"channels": 6,
"bitrate": 768,
"language": "English",
"languageTag": "en",
"languageCode": "eng",
"audioChannelLayout": "5.1(side)",
"samplingRate": 48000,
"streamIdentifier": "2",
"displayTitle": "English (EAC3 5.1)",
"extendedDisplayTitle": "English (EAC3 5.1)"
}
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] subtitleStream: none
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] WARN - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Failed to create and set current playable media item - File is unplayable. Color space is not supported.
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] WARN - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] [PlaybackSessionController] we failed to create a playable URL!
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] ERROR - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Playback error occurred. Reason: FailedToCreatePlayable, Failed to create a playable with the current play queue item! Message: File is unplayable. Color space is not supported.
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] WARN - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] [PlaybackSessionController] could not retry, reporting error
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] WARN - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] [PlaybackMetrics] Player sent ready signal or closed but no player or playable provided!
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Opening modal: ActionsModal
Jul 28, 2022 08:04:31.108 [0x7fc75ae61b38] INFO - [Req#8d5] [Plex for LG] [###redacted###:4yd8ylzhpcea7qecx67ue8ed] Opened modal: ActionsModal
Jul 28, 2022 08:04:27.031 [0x7fc75969bb38] DEBUG - Request: [Removed.118:37466 (Subnet)] GET /video/:/transcode/universal/decision?directPlay=0&directStream=0&directStreamAudio=1&protocol=hls&fastSeek=1&path=%2Flibrary%2Fmetadata%2F103686&session=z5qq48ni2akeblxste6qy7aa&mediaIndex=0&partIndex=0&mediaBufferSize=50000&hasMDE=1&subtitleSize=100&videoQuality=100&videoResolution=3840x2160&audioBoost=100&location=lan (9 live) #8d0 GZIP Signed-in Token (###redacted###) (LG OLED65CXAUA)Jul 28, 2022 08:04:27.031 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Found session GUID of z5qq48ni2akeblxste6qy7aa in session start.
Jul 28, 2022 08:04:27.031 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] TranscodeUniversalRequest: adapting profile with augmentation data: add-transcode-target(type=videoProfile&context=streaming&protocol=hls&container=mpegts&videoCodec=h264,hevc,mpeg2video,mpeg4&audioCodec=aac,ac3,eac3,mp2,mp3)+add-limitation(scope=videoAudioCodec&scopeName=mp2&type=upperBound&name=audio.bitrate&value=350)+add-limitation(scope=videoAudioCodec&scopeName=mp3&type=upperBound&name=audio.bitrate&value=350)+add-limitation(scope=videoCodec&scopeName=h264&type=upperBound&name=video.level&value=51)+add-limitation(scope=videoTranscodeTarget&scopeName=h264&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.bitDepth&value=8)+add-limitation(scope=videoTranscodeTarget&scopeName=h264&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.width&value=3840)+add-limitation(scope=videoTranscodeTarget&scopeName=h264&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.height&value=2160)+add-limitation(scope=videoTranscodeTarget&scopeName=hevc&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.bitDepth&value=10)+add-limitation(scope=videoTranscodeTarget&scopeName=hevc&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.width&value=3840)+add-limitation(scope=videoTranscodeTarget&scopeName=hevc&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.height&value=2160)+add-limitation(scope=videoCodec&scopeName=hevc&type=notMatch&name=video.DOVIProfile&value=5)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg2video&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.bitDepth&value=8)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg2video&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.width&value=1920)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg2video&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.height&value=1080)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg4&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.bitDepth&value=8)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg4&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.width&value=1920)+add-limitation(scope=videoTranscodeTarget&scopeName=mpeg4&scopeType=videoCodec&context=streaming&protocol=hls&type=upperBound&name=video.height&value=1080)
Jul 28, 2022 08:04:27.032 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] TranscodeUniversalRequest: using augmented profile Generic
Jul 28, 2022 08:04:27.032 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Downloading document http://127.0.0.1:32400/library/metadata/103686?includeBandwidths=1&offset=-1&X-Plex-Incomplete-Segments=1&X-Plex-Session-Identifier=4yd8ylzhpcea7qecx67ue8ed
Jul 28, 2022 08:04:27.057 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode/Req#8d1] We're going to try to auto-select an audio stream for account 1.
Jul 28, 2022 08:04:27.057 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode/Req#8d1] Selecting best audio stream for part ID 210587 (autoselect: 0 language: en)
Jul 28, 2022 08:04:27.057 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode/Req#8d1] Audio Stream: 513292, Subtitle Stream: -1
Jul 28, 2022 08:04:27.074 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi
Jul 28, 2022 08:04:27.074 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: testing API vaapi
Jul 28, 2022 08:04:27.075 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: Testing with profile 'Main 10'
Jul 28, 2022 08:04:27.075 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Failed setup for format vaapi_vld: hwaccel initialisation returned error.
Jul 28, 2022 08:04:27.076 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: 10-bit HEVC test returned software frame
Jul 28, 2022 08:04:27.076 [0x7fc75969bb38] WARN - [Req#8d0/Transcode] Codecs: packet decode testing returned -95 for decoder 'hevc'
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: testing API nvdec
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Cannot load libcuda.so.1
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Could not dynamically load CUDA
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Could not create hardware context for hevc
Jul 28, 2022 08:04:27.077 [0x7fc75ae61b38] DEBUG - Request: [Removed.143:58106 (Subnet)] GET /:/timeline?key=%2Flibrary%2Fmetadata%2F94823&ratingKey=94823&state=playing&time=1966184&duration=5160523&playbackTime=1474234&playQueueItemID=214823&context=search%3AtopResults (9 live) #8c4 GZIP Signed-in Token (Family)
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: Selected protocol hls; container: mpegts
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: analyzing media item 209040
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: Direct Play is disabled
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: media must be transcoded in order to use the hls protocol
Jul 28, 2022 08:04:27.077 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: no direct play video profile exists for http/mp4/hevc
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: no direct play video profile exists for http/mp4/hevc/eac3
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Bring It Down - video.DOVIProfile limitation applies: 5 == 5
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: Direct Streaming is disabled, so video stream will be transcoded
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: E7 - Bring It Down: no remuxable profile found, so video stream will be transcoded
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: Cannot direct stream video stream due to profile or setting limitations
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: testing hevc (decoder) with hwdevice vaapi
Jul 28, 2022 08:04:27.078 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: testing API vaapi
Jul 28, 2022 08:04:27.079 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: Testing with profile 'Main 10'
Jul 28, 2022 08:04:27.079 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Failed setup for format vaapi_vld: hwaccel initialisation returned error.
Jul 28, 2022 08:04:27.079 [0x7fc75ae61b38] DEBUG - [Req#8c4] Client [glhne9w7q2si26drulouvq6y] reporting timeline state playing, progress of 1966184/5160523ms for guid=, playbackTime=1474234ms ratingKey=94823 url=, key=/library/metadata/94823, containerKey=, metadataId=94823, source=
Jul 28, 2022 08:04:27.080 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: 10-bit HEVC test returned software frame
Jul 28, 2022 08:04:27.080 [0x7fc75969bb38] WARN - [Req#8d0/Transcode] Codecs: packet decode testing returned -95 for decoder 'hevc'
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: testing hevc (decoder) with hwdevice nvdec
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: testing API nvdec
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Cannot load libcuda.so.1
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] [FFMPEG] - Could not dynamically load CUDA
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Codecs: hardware transcoding: opening hw device failed - probably not supported by this system, error: Unknown error occurred
Jul 28, 2022 08:04:27.081 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Could not create hardware context for hevc
Jul 28, 2022 08:04:27.082 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] MDE: For All Mankind - S3 E7 - Bring It Down: selected media 0 / 209040
Jul 28, 2022 08:04:27.082 [0x7fc75969bb38] ERROR - [Req#8d0/Transcode] Streaming Resource: Cannot make a decision because either the file is unplayable or the client provided bad data
Jul 28, 2022 08:04:27.083 [0x7fc75969bb38] DEBUG - [Req#8d0/Transcode] Streaming Resource: Reached Decision id=103686 codes=(General=2000,Neither direct play nor conversion is available. Direct Play=3000,App cannot direct play this item. Direct play is disabled. Transcode=2003,File is unplayable. Color space is not supported.) media=(id=209040 part=(id=210587 decision=none container=mpegts protocol=hls streams=(Video=(id=513291 decision=transcode bitrate=2147483647 encoder=h264_vaapi width=3840 height=1920) Audio=(id=513292 decision=copy channels=6 rate=48000))))