Transcoding 4k Problems

[jawlessemu]

i dont understand question.
it does have a jellyfin app but thats all.

[Serge K]

check settings of jellyfin app - must be possibility to choose/change player

your hardware is very powerful - it is enough for transcoding of 4k to lower format for your roku tv

[jawlessemu]

i played the movie through the roku media player and it played just fine. so it must just be the jellyfin app for roku thats the problem. are there any recommendations for a player app besides jellyfin's and the roku one?

[Serge K]

you can use jellyfin playing video with VLC player

[jawlessemu]

is there a tutorial for this? i searched and didnt find anything clear

[Serge K]

is there a tutorial for this? i searched and didnt find anything clear

unfortunatelly I dont known Jellyfin for Roku
You can try to find how to change player in th setting of Jellyfin Roku

[tmsrxzar]

if you haven't enabled an option to scale the video to 1080 in the roku Client then the server will not scale
if you don't have the option in the Client to change scaling then you need to wait for a new version
barring those 2 things the only option left is to re-encode or use a different client/device to play 4k

[oopsmybad]

I've also been facing this (or a similar issue).

I have all TCL Roku TV's in my house. The TVs with 'Roku Ultra' equivalents built in all stream 4k content as expected. Specifically, they show the media in 4k - but if I go into the Jellyfin app's settings and change the bit rate to '1'mbps for example, the movie is transcoded down in resolution, like you would expect:

Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x1600, SAR 1:1 DAR 12:5, 23.98 fps, 23. 98 tbr, 1k tbn (default)
...
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> hevc (hevc_qsv))
...
  Stream #0:0: Video: hevc (hvc1 / 0x3163766, qsv(tv, bt709, progressive), 720x300 [SAR 1:1 DAR 12:5], q=2-31, 1000 kb/s, 23.98 fps, 90k tbn (default)

(You can see I have QSV acceleration enabled, no tone mapping (that's broken with my Synology 918+), and hevc encoding is enabled - but I don't think any of that plays role in the next part).


Now, on the cheapest TCL Roku TVs (32" 1080p's), doing the same thing -- setting a bandwidth limit to 1mbps - doesn't actually do anything. When I try to stream the same movie as above on that TV, this is what happens:

Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x1600, SAR 1:1 DAR 12:5, 23.98 fps, 23.98 tbr, 1k tbn (default)
...
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_qsv))
...
  Stream #0:0: Video: h264, qsv(tv, bt709, progressive), 3840x1600 [SAR 1:1 DAR 12:5], q=2-31, 35291 kb/s, 23.98 fps, 90k tbn (default)

Here, even with the lowest bit rate specififed in the Jellyfin Roku app, it doesn't get transcoded down in resolution (and the bit rate isn't 1mbps). It stays 4k, which the TV doesn't support. (The Roku TVs have Roku built into the hardware - so you don't get the option to specifiy a resolution.)

It seems like something is awry when it comes to setting a bandwidth limit and the resulting transcoding experience -- but not on all Roku TVs. Just on that one Roku platform (low end TCL).

Just my observations!

[TheDreadPirate]

Now, on the cheapest TCL Roku TVs (32" 1080p's), doing the same thing -- setting a bandwidth limit to 1mbps - doesn't actually do anything. When I try to stream the same movie as above on that TV, this is what happens:

Stream #0:0(eng): Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x1600, SAR 1:1 DAR 12:5, 23.98 fps, 23.98 tbr, 1k tbn (default)
...
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_qsv))
...
  Stream #0:0: Video: h264, qsv(tv, bt709, progressive), 3840x1600 [SAR 1:1 DAR 12:5], q=2-31, 35291 kb/s, 23.98 fps, 90k tbn (default)

Here, even with the lowest bit rate specififed in the Jellyfin Roku app, it doesn't get transcoded down in resolution (and the bit rate isn't 1mbps). It stays 4k, which the TV doesn't support. (The Roku TVs have Roku built into the hardware - so you don't get the option to specifiy a resolution.)

It seems like something is awry when it comes to setting a bandwidth limit and the resulting transcoding experience -- but not on all Roku TVs. Just on that one Roku platform (low end TCL).

Just my observations!

This sounds like a bug and you should definitely submit an issue on the Roku app github.

https://github.com/jellyfin/jellyfin-roku/issues