Issue with Transcoding and my Roku Ultra LT

[snfe6590 0]

Hi All,

I just got a shiny new Samsung UHD TV and wanted to see how streaming a 2160p video through to my Roku Ultra LT would go, and expected direct streaming, but it ends up transcoding instead and Im not sure why.

The reason given in the transcoding log file (attached) is: TranscodeReasons=VideoBitDepthNotSupported. The video has a bit depth of 10, and as far as I can tell both the Roku and the TV support that bit depth.

My Roku display settings are set to the HDR10+ setting (Cant remember what the actual wording is), and the TV specs say that it supports that as well.

This is the video details from MediaInfo:

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High 10@L5.1
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 2 h 6 min
Bit rate                                 : 19.9 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 076 pixels
Display aspect ratio                     : 1.85:1
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 10 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.104
Stream size                              : 17.6 GiB (93%)
Writing library                          : x264 core 157 r2970 5493be8
Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=81 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Menus                                    : 4
Codec configuration box                  : avcC

 

Can anyone see something that Im unaware of in there that would force Emby to transcode vs. direct stream this video?

ffmpeg-transcode-86b038cb-c045-4b96-809b-90d106cb50d9_1.txt

[speechles 1920]

https://developer.roku.com/en-ca/docs/specs/media/streaming-specifications.md

Unfortunately, this is not an issue.

The Roku can only play UHD/2160P/10bit material when presented with HEVC, VP9, or AV1. It will not be possible to direct play your 10bit AVC on any Roku model. Apologies.

DolbyVision Profile 9 is supported in AVC but only in 1920x1080.

Edited November 16, 2022 by speechles

[snfe6590 0]

So then I just need to re-encode using h.265 instead right?

[speechles 1920]

Yes. If the item were encoded with HEVC to start with you wouldn't have made this post and we wouldn't be having this conversation. But then we wouldn't be able to explain to you exactly how the Roku works. So in a way even though you didn't get it to work you found out how to always avoid the situation in the future.

Always nice to meet a fellow Emby user. May your day be bright and full of cheer. Hopefully encoding isn't a PITA.

Edited November 16, 2022 by speechles

[snfe6590 0]

This is great, and super helpful. Thanks!