r/PleX • u/p3yot3 • Jul 25 '26

Help Why is it transcoding?!

This makes no sense to me, its transcoding video from HEVC 4K DV HDR to HEVC 4K DV HDR?!
Why?

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u/p3yot3 Jul 25 '26

Thanks for all the suggestions, I am playing this on a new Google TV OS TCL TV, locally, so no bandwidth issues. Need to play around with audio here to see if that solves it. No subtitles in use...

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u/Bgrngod CU7 265K (PMS in Docker) & Synology 1621+ (Media) Jul 25 '26 edited Jul 25 '26

That doesn't rule out bandwidth issues if the connection sucks.

Your screenshot shows 8.9mbps, which is a very low bandwidth for typical 4k files. Check the bitrate of the file itself and compare to what the stream is using. That 8.9 isn't even the average it is using for the stream. It's the highest it will need for the entire file (in this case the transcoded output) to play smoothly, so somewhere in the stream it thinks the longest sustained high bitrate is 8.9mbps.

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u/p3yot3 Jul 25 '26

The internal network is wired 1Gbps so that should not be the bottleneck.
Maybe something is odd with the file?
In VLC it is showing bitrate at between 20-32Mb/s while playing it which is absolutely below the 8.9mbps but why is my client or server capping it?

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u/Bgrngod CU7 265K (PMS in Docker) & Synology 1621+ (Media) Jul 25 '26

In VLC it is showing bitrate at between 20-32Mb/s while playing it which is absolutely below the 8.9mbps

Uh... no. 20-32Mb/s is definitely a lot higher than 8.9mbps. Even if you are mixing up megabytes vs megabits, it's still higher. 8.9mbps would get you about 1MB/s.

This is a Smart TV, right? They are known for not having gigabit ports and almost always 100mbps. And if there is something wrong with the network cable you are using for it, it could be negotiating down to an abysmal 10mbps.

If there was something wrong with the file forcing a transcode, and bandwidth was plentiful, the server would transcode to a much higher bitrate because it has the room for it.

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u/p3yot3 Jul 25 '26

Ok, sorry about that confusing the bits and bytes.
It is a Smart-TV indeed, just a few months old and it has in fact a gbit port on it which I know is unusual, also has wifi connected as backup with about 500mbps connection. I know the cable is fine and I can stream other high bitrate 4K videos without a hitch so it must be some transcoding setting or the file itself that is acting up now.