Why is transcoding?

[biaginilucas]

Server Version#: 1.25.6.5577-c8bd13540 & 1.26.1.5798
Player Version#: Samsung TV tizen 5.39.1

Hi guys! first off all sorry about my english…
I have plex premium for the last 2years with 500+movies, and never had a problem, using it with windows player and android. Actually i am moving the plex server to unraid (had plex server running on windows) so i have 2 plex servers running right now to test.
Today arrive my new tv, its a samsung AU7000 43" and when try to view some 4k movies, in some need transcoding, but why???

The TV support: (samsung with tizen)
HDR10+ - Resolution: 3,840 x 2,160 (UHD)

WHY IS DIRECT PLAYING THIS MOVIE
-The Matrix
-Container MKV
-Video Profile main 10
-Códec: MPEG-H Part2/HEVC (H.265) (hevc)
-Bitrate 29010 kbps
-Bit Depth 10
-Resolución de vídeo: 3840x1600
-Dimensiones del «buffer»: 3840x1600
-Tasa de fotogramas: 23.976216
-Orientación: Arriba-Izquierda
-Colores primarios: ITU-R BT.2020
-Función de transferencia de color: SMPTE ST2084 (PQ)

AND THIS NEED TRANSCODING
-Monster, Inc.
-Container MKV
-Video Profile main 10
-Códec: MPEG-H Part2/HEVC (H.265) (hevc)
-Bitrate 17716 kbps
-Bit Depth 10
-Resolución de vídeo: 3840x2076
-Dimensiones del «buffer»: 3840x2080
-Tasa de fotogramas: 23.976024
-Orientación: Arriba-Izquierda
-Colores primarios: ITU-R BT.2020
-Función de transferencia de color: SMPTE ST2084 (PQ)
-Espacio de color: RangoITU-R BT.2020
-Max. luminancia: 1000.0000 cd/m²
Codec HEVC

WHY??? What’s the differences between this two movies? Its almost the same codec? “Audio codec not matter here”.

THANKS!

[FordGuy61]

There could be many reasons. For example:

1. Samsung TVs cannot direct play TrueHD or dts audio.

2. Enabling PGS or VOBSUB subtitles will result in a video transcode.

3. Depending on various conditions, enabling SRT or ASS subtitles may result in a video transcode.

4. Bandwidth limits.

5. Playing media with over 30 tracks, video + audio + subtitle, will result in direct streaming and may result in transcoding.

If none of the above fit, then you’ll need to provide additional information.

Start with a screenshot of Plex Dashboard → Now Playing (expanded view).

Also, a set of server logs that capture the playback. Make sure your server is set for debug, not verbose, level logging. Settings → Server_Name → General.

Plex Dashboard example:

[biaginilucas]

It was the PGS subtitles!
Thanks so much for your time! I didn’t know that need transcoding to read PGS subtitles…

answers:

1. Tv can play dts, not sure about TrueHD
2. Yeah its was the PGS subtitles
3. Yes again
4. No! the movie thats plays direct have more bitrate
5. No, Im just playing 1 movie with 1 video track and 1/2 audio and subtitles

THANKS AGAIN!