I have some 4K files (HEVC Main 10 HDR) When they start playing on my TV I see the HDR notification on top-right corner. Every seems to go well but after a few minutes the video pauses and when the image comes back it has HDR disabled (colors are less saturated). Looks just like when you open an HDR file on a non-HDR screen.
I’ve managed to get some logs that might be related to this problem
Mar 21, 2019 22:40:21.296 [0x1508fdfef700] Error — Throttle: timed out trying to read chunk -1
Mar 21, 2019 22:40:24.152 [0x1508fdfef700] Error — Throttle: timed out trying to read chunk -1
Mar 21, 2019 22:40:24.341 [0x1508fcde6700] Error — [FFMPEG] - Cannot load libcuda.so.1
Mar 21, 2019 22:40:24.341 [0x1508fcde6700] Warning — avcodec_open2 returned -1313558101 for encoder 'h264_nvenc'
Mar 21, 2019 22:40:24.351 [0x1508fcde6700] Error — [FFMPEG] - No VA display found for device: /dev/dri/renderD128.
Mar 21, 2019 22:40:24.352 [0x1508fcde6700] Error — [FFMPEG] - Cannot load libcuda.so.1
Mar 21, 2019 22:40:24.352 [0x1508fcde6700] Warning — avcodec_open2 returned -1313558101 for encoder 'h264_nvenc'
Mar 21, 2019 22:40:24.352 [0x1508fcde6700] Error — [FFMPEG] - No VA display found for device: /dev/dri/renderD128.
Mar 21, 2019 22:40:24.354 [0x1508febf5700] Error — Failed to delete session directory (boost::filesystem::remove: Directory not empty: "/config/Plex Media Server/Cache/Transcode/Sessions/plex-transcode-8o54ak89hnkduqdlcsot2p76-377fd138-28f6-4972-932b-6a6b2a1c7aba")
Anyone got any idea what’s going on here? If I play a 1080 movie with no HDR then everything works just fine.
Thank you!
Server Version#: 1.15.2.793
Player Version#: Plex for LG 3.90.1 (WebOS 4.10.31)
TV: LG OLED65C8PLA
Doing direct play on video and audio
for any number of reasons, the stream is switching from direct play to transcoding down to 1080 (thus loosing both 4k and HDR).
the logs indicate that you do not have hardware assisted transcoding, so that causes your cpu to convert the 4k, and which is extremely process intensive and your server cannot keep up.
most smart tvs cannot direct play HD audio which is the typical culprit.
subtitles also can cause problems and make plex transcode.
you can make sure subtitles are disabled, and choose a different audio stream (ie dolby digital/dtx 5.1).
I would start by disabling subtitles and see if that fixes it
then I would start looking at the network, most smart tvs only have 100mbit ethernet, and 4k rips can exceed that.
Wireless can work, but typically isn’t consistently fast enough to prevent buffering.
in that server status window should be a bandwidth graph, if it is flattens out around ~100mbit and still buffers/switches, it looks like you may be exceeding the tv ethernet connection.
if the bw graph is all over the place and you are on wireless, then sounds like your wireless is not keeping up.
If your plex client settings has ‘automatically adjust quality’ I would disable that too, and make sure remote and local quality is original and/or maximum.
not exactly, there are different kinds of subtitles, some subtitles/clients can be direct play, some clients/subs must have them burned in (ie transcoded in)
so depending on what your client can direct play, and what subs you have (or can get), will determine when/why the resulting video is transcoded
I have to say that in the scene there wasn’t any subtitles showing up, but I guess the fact that these were enable is enough to trigger this. However why is transcoding at 1080 without HDR instead of 4K with HDR if I have plenty of power to do so
