Server Version#: 1.20.3.3437 (on MacOS X Catalina)
Player Version#: 5.2.1 LG WebOS
Platform Version#: 5.1.0
I have an issue where playing a 4K movie on our LG TV 55UN7300PUF will buffer indefinitely, unless I force it to convert to a lower bit rate, and then I can change it back to direct playing the original source media.
We have a RaspPi 4 Plex server which works well for most things, including 4K, so long as there’s no transcoding needed (as expected). We have some 4K movie files that have 7.1 DTS which our system doesn’t support, so I have to disable DTS and force it to transcode just the audio down to AAC 5.1. This almost works, but the Pi can’t keep up and it re-buffers every few minutes.
To address this, I setup a new Plex Server on an old Mac Mini. This works great, but only with the above mentioned workaround. When I start a 4K movie that needs the audio transcoded, (the video is fine to direct play), it sits in a “buffering” state forever. While it’s there I can select a lower quality. It then transcodes the video as well at the lower bitrate. As soon as that starts to play I can set the video quality back to the original, and it works fine after that without having to transcode the video (just audio).
Any ideas? Advice appreciated.
I don’t have this issue on the Windows Plex Player which is not only a different platform, but doesn’t need the audio transcoded so it’s direct playing both streams.
Sample details from the mediainfo utility if it helps:
General
Format : Matroska
Format version: Version 4
File size: 21.5 GiB
Duration: 2 h 32 min
Overall bit rate mode: Variable
Overall bit rate: 20.2 Mb/s
Encoded date: UTC 2018-02-10 13:47:15
Writing application: mkvmerge v20.0.0 (‘I Am The Sun’) 64-bit
Writing library: libebml v1.3.5 + libmatroska v1.4.8
Video
ID : 1
Format: HEVC
Format/Info: High Efficiency Video Coding
Commercial name: HDR10
Format profile: Main 10@L5.1@High
Codec ID: V_MPEGH/ISO/HEVC
Duration: 2 h 32 min
Width: 3840 pixels
Height: 1596 pixels
Display aspect ratio: 2.40:1
Frame rate mode: Constant
Frame rate: 23.976 (24000/1001) FPS
Color space: YUV
Chroma subsampling: 4:2:0 (Type 2)
Bit depth: 10 bits
Writing library: x265 2.6+22-ff02513b92c0:[Windows][GCC 6.3.0][64 bit] 10bit
Encoding settings: cpuid=1173503 / frame-threads=4 / numa-pools=16 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 /
input-res=3840x1596 / interlace=0 / total-frames=219173 / level-idc=51 / high-tier=1 / uhd-bd=0 / ref=4 / no-allow-non-conformance / repeat-headers / annexb / aud /
hrd / info / hash=0 / no-temporal-layers / no-open-gop / min-keyint=1 / keyint=24 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead
=25 / lookahead-slices=4 / scenecut=40 / radl=0 / no-intra-refresh / ctu=64 / min-cu-size=8 / rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / l
imit-tu=0 / rdoq-level=2 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / no-strong-intra-smoothing / max-merge
=3 / limit-refs=3 / limit-modes / me=3 / subme=3 / merange=57 / temporal-mvp / weightp / no-weightb / no-analyze-src-pics / deblock=-3:-3 / no-sao / no-sao-non-debloc
k / rd=4 / no-early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / no-b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=1.00 / no-rd-r
efine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=crf / crf=17.0 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=0 / vbv-maxrate=160000 / vbv-bufsize=160000 / v
bv-init=0.9 / crf-max=0.0 / crf-min=0.0 / ipratio=1.40 / pbratio=1.30 / aq-mode=1 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grai
n / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=9 / transfer=16 / colormatrix=9 / chromaloc=1 / chromaloc-top=2 / chr
omaloc-bottom=2 / display-window=0 / master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(40000000,50) / max-cll=552,190 / min-luma=0 / max-luma=10
23 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / no-opt
-cu-delta-qp / no-aq-motion / hdr / hdr-opt / no-dhdr10-opt / analysis-save=(null) / analysis-load=(null) / analysis-reuse-level=5 / scale-factor=0 / refine-intra=0 /
refine-inter=0 / refine-mv=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-mv-type=0 / copy-pic=1
Default: Yes
Forced: No
Color range: Limited
Color primaries: BT.2020
Transfer characteristics: PQ
Matrix coefficients: BT.2020 non-constant
Mastering display color primaries: Display P3
Mastering display luminance: min: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level: 552 cd/m2
Maximum Frame-Average Light Level: 190 cd/m2
Audio
ID : 2
Format: DTS XLL X
Format/Info: Digital Theater Systems
Commercial name: DTS-HD Master Audio
Codec ID: A_DTS
Duration: 2 h 32 min
Bit rate mode: Variable
Channel(s): 8 channels
Channel(s)_Original: Object Based
Channel layout: Object Based
Sampling rate: 48.0 kHz
Frame rate: 93.750 FPS (512 SPF)
Bit depth: 24 bits
Language: English
Default: Yes
Forced: No
