Look at the output -
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - Format 0x33434d49 -> unknown.
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - Format 0x30313050 -> p010le.
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] VERBOSE - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 21.3.5 (a51add3).
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] VERBOSE - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - Driver not found in known nonstandard list, using standard behaviour.
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - Created surface 0.
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] [FFMPEG] - Direct mapping possible.
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] TPU: hardware transcoding: final decoder: vaapi, final encoder: vaapi
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] VERBOSE - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA] Sufficient disk space: 951.72kB source file, 24.44TB capacity, 7.1TB available on "/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex Media Server/Cache/Transcode/Sessions"
Dec 26, 2021 17:14:01.488 [0x7f6432de1b38] DEBUG - [Transcode/E65C7BCE-72C0-4C17-97C1-D52847AB42AA/JobRunner] Job running: FFMPEG_EXTERNAL_LIBS='/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex\ Media\ Server/Codecs/fb9eae3-4185-linux-x86_64/' LIBVA_DRIVERS_PATH='/volume1/@appstore/PlexMediaServer/lib/dri' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/volume1/@appstore/PlexMediaServer/Plex Transcoder' '-codec:0' 'hevc' '-hwaccel:0' 'vaapi' '-hwaccel_fallback_threshold:0' '10' '-hwaccel_output_format:0' 'vaapi' '-hwaccel_device:0' 'vaapi' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/volume1/Plex/Library/Övriga filmer/F-J/Jurassic.Park.1993.REMUX.2160p.(10bit).BluRay.UHD.HDR.HEVC.DTS-HD.MA.7.1-LEGi0N.mkv' '-filter_complex' '[0:0]hwupload[0];[0]scale_vaapi=w=1920:h=1080:format=p010[1];[1]hwdownload[2];[2]format=p010,tonemap=mobius[3];[3]hwupload[4]' '-map' '[4]' '-metadata:s:0' 'language=eng' '-codec:0' 'h264_vaapi' '-b:0' '46311k' '-maxrate:0' '61749k' '-bufsize:0' '123498k' '-r:0' '23.975999999999999' '-force_key_frames:0' 'expr:gte(t,n_forced*1)' '-map' '0:1' '-metadata:s:1' 'language=eng' '-codec:1' 'copy' '-copypriorss:1' '0' '-map' '0:2' '-metadata:s:2' 'language=eng' '-codec:2' 'copy' '-map' '0:t?' '-codec:t' 'copy' '-segment_format' 'matroska' '-f' 'ssegment' '-individual_header_trailer' '0' '-flags' '+global_header' '-segment_header_filename' 'header' '-segment_time' '1' '-segment_start_number' '0' '-segment_copyts' '1' '-segment_time_delta' '0.0625' '-segment_list' 'http://127.0.0.1:32400/video/:/transcode/session/E65C7BCE-72C0-4C17-97C1-D52847AB42AA/37cabb6d-ea62-449b-8270-940c79e82c4f/manifest?X-Plex-Http-Pipeline=infinite' '-segment_list_type' 'csv' '-segment_list_size' '5' '-segment_list_separate_stream_times' '1' '-segment_list_unfinished' '1' '-segment_format_options' 'output_ts_offset=10' '-max_delay' '5000000' '-avoid_negative_ts' 'disabled' '-map_metadata:g' '-1' '-map_metadata:c' '-1' '-map_chapters' '-1' 'media-%05d.ts' '-start_at_zero' '-copyts' '-vsync' 'cfr' '-init_hw_device' 'vaapi=vaapi:' '-filter_hw_device' 'vaapi' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/E65C7BCE-72C0-4C17-97C1-D52847AB42AA/37cabb6d-ea62-449b-8270-940c79e82c4f/progress'
versus
Dec 26, 2021 17:16:22.168 [0x7f6432de1b38] VERBOSE - [Transcode/86F4102B-648B-48BB-B906-9BA22708C1FF] Sufficient disk space: 951.72kB source file, 24.44TB capacity, 7.1TB available on "/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex Media Server/Cache/Transcode/Sessions"
Dec 26, 2021 17:16:22.168 [0x7f6432de1b38] DEBUG - [Transcode/86F4102B-648B-48BB-B906-9BA22708C1FF/JobRunner] Job running: FFMPEG_EXTERNAL_LIBS='/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex\ Media\ Server/Codecs/fb9eae3-4185-linux-x86_64/' LIBVA_DRIVERS_PATH='/volume1/@appstore/PlexMediaServer/lib/dri' X_PLEX_TOKEN='xxxxxxxxxxxxxxxxxxxx' '/volume1/@appstore/PlexMediaServer/Plex Transcoder' '-codec:0' 'hevc' '-hwaccel:0' 'vaapi' '-hwaccel_fallback_threshold:0' '10' '-hwaccel_output_format:0' 'vaapi' '-hwaccel_device:0' 'vaapi' '-ss' '1560' '-analyzeduration' '20000000' '-probesize' '20000000' '-i' '/volume1/Plex/Library/Övriga filmer/F-J/Jurassic.Park.1993.REMUX.2160p.(10bit).BluRay.UHD.HDR.HEVC.DTS-HD.MA.7.1-LEGi0N.mkv' '-filter_complex' '[0:0]hwupload[0];[0]scale_vaapi=w=1920:h=1080:format=p010[1];[1]hwdownload[2];[2]format=p010,tonemap=mobius[3];[3]hwupload[4]' '-map' '[4]' '-metadata:s:0' 'language=eng' '-codec:0' 'h264_vaapi' '-b:0' '46311k' '-maxrate:0' '61749k' '-bufsize:0' '123498k' '-r:0' '23.975999999999999' '-force_key_frames:0' 'expr:gte(t,n_forced*1)' '-map' '0:1' '-metadata:s:1' 'language=eng' '-codec:1' 'copy' '-copypriorss:1' '0' '-map' '0:2' '-metadata:s:2' 'language=eng' '-codec:2' 'copy' '-map' '0:t?' '-codec:t' 'copy' '-segment_format' 'matroska' '-f' 'ssegment' '-individual_header_trailer' '0' '-flags' '+global_header' '-segment_header_filename' 'header' '-segment_time' '1' '-segment_start_number' '1560' '-segment_copyts' '1' '-segment_time_delta' '0.0625' '-segment_list' 'http://127.0.0.1:32400/video/:/transcode/session/86F4102B-648B-48BB-B906-9BA22708C1FF/29ca6cfa-dc06-4b49-9843-a8b925b95a0b/manifest?X-Plex-Http-Pipeline=infinite' '-segment_list_type' 'csv' '-segment_list_size' '5' '-segment_list_separate_stream_times' '1' '-segment_list_unfinished' '1' '-segment_format_options' 'output_ts_offset=10' '-max_delay' '5000000' '-avoid_negative_ts' 'disabled' '-map_metadata:g' '-1' '-map_metadata:c' '-1' '-map_chapters' '-1' 'media-%05d.ts' '-start_at_zero' '-copyts' '-init_hw_device' 'vaapi=vaapi:' '-filter_hw_device' 'vaapi' '-y' '-nostats' '-loglevel' 'quiet' '-loglevel_plex' 'error' '-progressurl' 'http://127.0.0.1:32400/video/:/transcode/session/86F4102B-648B-48BB-B906-9BA22708C1FF/29ca6cfa-dc06-4b49-9843-a8b925b95a0b/progress'
This is an app problem or a network problem.
Dec 26, 2021 17:16:22.048 [0x7f6435bc2b38] VERBOSE - [IDLE] * http_download - /video/:/transcode/universal/session/86F4102B-648B-48BB-B906-9BA22708C1FF/base/00003.ts - 1 active item(s)
Dec 26, 2021 17:16:22.048 [0x7f6435bc2b38] VERBOSE - [IDLE] * transcoder - 86F4102B-648B-48BB-B906-9BA22708C1FF - 1 active item(s)
Dec 26, 2021 17:16:22.048 [0x7f6435bc2b38] VERBOSE - [IDLE] * transcoder - F63926DD-D1DE-4256-997C-4B16AD198725 - 1 active item(s)
Dec 26, 2021 17:16:22.048 [0x7f6435bc2b38] DEBUG - Removed transcode data consumer, active count 2 => 1
Dec 26, 2021 17:16:22.048 [0x7f6435be5b38] DEBUG - Failed to stream media, client probably disconnected after 294912 bytes: 104 - Connection reset by peer
Dec 26, 2021 17:16:22.048 [0x7f6435be5b38] DEBUG - Completed after connection close: [192.168.0.2:50217] 200 GET /video/:/transcode/universal/session/86F4102B-648B-48BB-B906-9BA22708C1FF/base/00003.ts (11 live) TLS 7619ms 294912 bytes (pipelined: 2)
Dec 26, 2021 17:16:22.048 [0x7f6435be5b38] VERBOSE - [IDLE] Removing (1->0) work item http_download - /video/:/transcode/universal/session/86F4102B-648B-48BB-B906-9BA22708C1FF/base/00003.ts
Dec 26, 2021 17:16:22.048 [0x7f6435be5b38] VERBOSE - [IDLE] * http_download - /library/parts/51110/1633741503/file.mkv?X-Plex-Client-Identifier=C9E1201A-D578-4454-BB56-DA85B3ACB0CE&X-Plex-Client-Platform=iOS&X-Plex-Device=iPhone&X-Plex-Device-Screen-Density=3&X-Plex-Device-Screen-Resolution=1242x2688&X-Plex-Device-Vendor=Apple&X-Plex-Drm=fairplay%3Avideo&X-Plex-Http-Pipeline=infinite&X-Plex-Model=12%2C5&X-Plex-Platform=iOS&X-Plex-Platform-Version=15.2&X-Plex-Product=Plex%20for%20iOS&X-Plex-Provides=client%2Ccontroller%2Csync-target%2Cplayer%2Cpubsub-player%2Cprovider-playback&X-Plex-Supported-Commands=abort%2CchangeQuality&X-Plex-Sync-Version=2&X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&X-Plex-Username=kristoffer.hellstrom%40gmail.com&X-Plex-Version=7.26&X-Plex-Language=sv&X-Plex-Device-Name=Khellstrom - 1 active item(s)
Dec 26, 2021 17:16:22.048 [0x7f6435be5b38] DEBUG - Failed to stream media, client probably disconnected after 294912 bytes: 104 - Connection reset by peer
Is this the ATV ?