Nvidia hardware decoding not working on some files

Plex Players Desktop Players
1

Server Version#: 1.30.0.648_12.0.8
Player Version#: 1.31.1.3412-f3195b0d

When using a nvidia gt1030 in windows 10, some 4k hdr rips (typically those with lower bitrates around 20ish mbps) do not use hardware acceleration to decode and thus play slowly and desync from audio (0 percent ‘video decode’ in task manager proves this). Disabling hardware acceleration fixes the issue, but hammers my cpu obviously. Here is an example log attached. Please lemme know if you need any more info, and thanks so much in advance!

2

Unfortunately, there is no log attached. Can you please upload your log? If possible also a mediainfo output of a file that falls back to sw decoding?

You can also try to play those files with the standalone mpv player. If decoding is also not working there, your files are probably encoded in a weird codec or encoding setting.

Download a build here => Releases · shinchiro/mpv-winbuild-cmake · GitHub

And run
mpv.com your-file.mkv -vo=gpu-next -hwdec=d3d11va -v - hit i and see if it says (hwdec: d3d11) next to the video codec

You can also try nvdec, a decoding API that supports more codecs (for example hevc 4:4:4)
mpv.com your-file.mkv -vo=gpu-next -hwdec=nvdec -gpu-context=vulkan -v - hit i and see if it says (hwdec: nvdec) next to the video codec.

1 Like
3

Thanks for replying and so sorry about that! It ended up being too long to paste in the body of the post, so here’s a pastebin

turns out another potential bug or issue with plexhtpc is that it gives a verbose log no matter what you set the settings to (this log is huge and I set it to INFO only)

I have tried it in mpv.com and it did play well, but I didn’t use the command line arguments to insist on a decoder like you’ve shown, and I’ll do that now. In the meantime there’s my log.

4

I believe there are a couple of other threads about this. I too am having issues with transcoding on some Blu Ray MKV files using my Tesla T4. Worked flawlessly prior to the last release.

1 Like
5

ok thanks for your patience. mpv gives a d3d11va under hw dec when running it in dvd11va
but the second command gives this error in the command line and fails:

[cplayer] Built with NDEBUG.
[cplayer] Setting option ‘vo’ = ‘gpu-next’ (flags = 8)
[cplayer] Setting option ‘hwdec’ = ‘nvdec’ (flags = 8)
[cplayer] Setting option ‘gpu-context’ = ‘vulkan’ (flags = 8)
[cplayer] Error parsing option gpu-context (option parameter could not be parsed)
[cplayer] Setting commandline option --gpu-context=vulkan failed.
[cplayer] Exiting… (Fatal error)

6

Ok so ive made more progress. Now knowing its an issue with the mpv bundled with this release, I replaced the mpv-2.dll in C:\program files\Plex\Plex HTPC with one from a new build of libmpv (Jan-1st) and it plays with full hw accell! It does however introduce new bugs, as plex team must use a custom version of the dll, I now have no plex UI while playing the video (can’t bring up the bottom plex menu during playback, you know stop play pause skip etc etc) and hitting escape and returning to the plex menu, it wont play any subsequent videos without erroring out and needs to be restarted to play another movie. This is obviously due to using the generic mpv-2.dll file rather than what I assume is a custom one that plex needs. Thanks hopefully this gives someone with the knowhow to fix this the right info to sort it!

7

@Mitzsch also forgot to add the mediainfo for the file you were asking about!
here it is!

General
Unique ID : 50896795525907652371843742124272020744 (0x264A5DC3100A7D7FE0EE82B267B06D08)
Complete name : Y:\Movies\Glass Onion A Knives Out Mystery (2022)\Glass Onion A Knives Out Mystery (2022) WEBDL-2160p.mkv
Format : Matroska
Format version : Version 4
File size : 19.2 GiB
Duration : 2 h 21 min
Overall bit rate : 19.5 Mb/s
Writing application : mkvmerge v67.0.0 (‘Under Stars’) 64-bit
Writing library : libebml v1.4.2 + libmatroska v1.6.4

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 h 19 min
Bit rate : 19.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 24.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.095
Stream size : 18.5 GiB (96%)
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: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 740 cd/m2
Maximum Frame-Average Light Level : 106 cd/m2

Audio
ID : 2
Format : E-AC-3 JOC
Format/Info : Enhanced AC-3 with Joint Object Coding
Commercial name : Dolby Digital Plus with Dolby Atmos
Codec ID : A_EAC3
Duration : 2 h 21 min
Bit rate mode : Constant
Bit rate : 768 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 775 MiB (4%)
Language : English
Service kind : Complete Main
Default : Yes
Forced : No
Complexity index : 16
Number of dynamic objects : 15
Bed channel count : 1 channel
Bed channel configuration : LFE

Text #1
ID : 3
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 86 b/s
Frame rate : 0.292 FPS
Count of elements : 2340
Stream size : 84.2 KiB (0%)
Title : English [SDH]
Language : English
Default : No
Forced : No

Text #2
ID : 4
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 115 b/s
Frame rate : 0.242 FPS
Count of elements : 2016
Stream size : 117 KiB (0%)
Title : Arabic
Language : Arabic
Default : No
Forced : No

Text #3
ID : 5
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 67 b/s
Frame rate : 0.234 FPS
Count of elements : 1945
Stream size : 68.3 KiB (0%)
Title : Basque
Language : Basque
Default : No
Forced : No

Text #4
ID : 6
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 65 b/s
Frame rate : 0.237 FPS
Count of elements : 1974
Stream size : 67.0 KiB (0%)
Title : Catalan
Language : Catalan
Default : No
Forced : No

Text #5
ID : 7
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.240 FPS
Count of elements : 1997
Stream size : 62.1 KiB (0%)
Title : Chinese Simplified
Language : Chinese
Default : No
Forced : No

Text #6
ID : 8
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 60 b/s
Frame rate : 0.249 FPS
Count of elements : 2074
Stream size : 62.0 KiB (0%)
Title : Chinese Traditional
Language : Chinese
Default : No
Forced : No

Text #7
ID : 9
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.235 FPS
Count of elements : 1953
Stream size : 62.0 KiB (0%)
Title : Croatian
Language : Croatian
Default : No
Forced : No

Text #8
ID : 10
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 12 min
Bit rate : 67 b/s
Frame rate : 0.250 FPS
Count of elements : 1994
Stream size : 65.5 KiB (0%)
Title : Czech
Language : Czech
Default : No
Forced : No

Text #9
ID : 11
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 75 b/s
Frame rate : 0.283 FPS
Count of elements : 2261
Stream size : 74.2 KiB (0%)
Title : Czech [SDH]
Language : Czech
Default : No
Forced : No

Text #10
ID : 12
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 64 b/s
Frame rate : 0.238 FPS
Count of elements : 1985
Stream size : 65.5 KiB (0%)
Title : Danish
Language : Danish
Default : No
Forced : No

Text #11
ID : 13
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.213 FPS
Count of elements : 1777
Stream size : 62.2 KiB (0%)
Title : Dutch
Language : Dutch
Default : No
Forced : No

Text #12
ID : 14
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 66 b/s
Frame rate : 0.236 FPS
Count of elements : 1963
Stream size : 67.4 KiB (0%)
Title : European Spanish
Language : Spanish
Default : No
Forced : No

Text #13
ID : 15
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 83 b/s
Frame rate : 0.290 FPS
Count of elements : 2317
Stream size : 81.1 KiB (0%)
Title : European Spanish [SDH]
Language : Spanish
Default : No
Forced : No

Text #14
ID : 16
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 64 b/s
Frame rate : 0.237 FPS
Count of elements : 1977
Stream size : 66.0 KiB (0%)
Title : Filipino
Language : fil
Default : No
Forced : No

Text #15
ID : 17
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 64 b/s
Frame rate : 0.225 FPS
Count of elements : 1871
Stream size : 65.2 KiB (0%)
Title : Finnish
Language : Finnish
Default : No
Forced : No

Text #16
ID : 18
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 63 b/s
Frame rate : 0.232 FPS
Count of elements : 1932
Stream size : 64.2 KiB (0%)
Title : French
Language : French
Default : No
Forced : No

Text #17
ID : 19
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 96 b/s
Frame rate : 0.291 FPS
Count of elements : 2322
Stream size : 94.3 KiB (0%)
Title : French [SDH]
Language : French
Default : No
Forced : No

Text #18
ID : 20
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.236 FPS
Count of elements : 1963
Stream size : 62.8 KiB (0%)
Title : Galician
Language : Galician
Default : No
Forced : No

Text #19
ID : 21
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 65 b/s
Frame rate : 0.234 FPS
Count of elements : 1951
Stream size : 66.7 KiB (0%)
Title : German
Language : German
Default : No
Forced : No

Text #20
ID : 22
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 94 b/s
Frame rate : 0.298 FPS
Count of elements : 2381
Stream size : 92.2 KiB (0%)
Title : German [SDH]
Language : German
Default : No
Forced : No

Text #21
ID : 23
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 111 b/s
Frame rate : 0.239 FPS
Count of elements : 1986
Stream size : 113 KiB (0%)
Title : Greek
Language : Greek
Default : No
Forced : No

Text #22
ID : 24
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 106 b/s
Frame rate : 0.239 FPS
Count of elements : 1992
Stream size : 108 KiB (0%)
Title : Hebrew
Language : Hebrew
Default : No
Forced : No

Text #23
ID : 25
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 67 b/s
Frame rate : 0.234 FPS
Count of elements : 1950
Stream size : 68.3 KiB (0%)
Title : Hungarian
Language : Hungarian
Default : No
Forced : No

Text #24
ID : 26
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 87 b/s
Frame rate : 0.292 FPS
Count of elements : 2336
Stream size : 85.2 KiB (0%)
Title : Hungarian [SDH]
Language : Hungarian
Default : No
Forced : No

Text #25
ID : 27
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 63 b/s
Frame rate : 0.239 FPS
Count of elements : 1990
Stream size : 64.3 KiB (0%)
Title : Indonesian
Language : Indonesian
Default : No
Forced : No

Text #26
ID : 28
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 64 b/s
Frame rate : 0.236 FPS
Count of elements : 1964
Stream size : 65.3 KiB (0%)
Title : Italian
Language : Italian
Default : No
Forced : No

Text #27
ID : 29
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 12 min
Bit rate : 82 b/s
Frame rate : 0.241 FPS
Count of elements : 1914
Stream size : 80.1 KiB (0%)
Title : Italian [SDH]
Language : Italian
Default : No
Forced : No

Text #28
ID : 30
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 55 b/s
Frame rate : 0.215 FPS
Count of elements : 1786
Stream size : 56.1 KiB (0%)
Title : Japanese
Language : Japanese
Default : No
Forced : No

Text #29
ID : 31
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 68 b/s
Frame rate : 0.242 FPS
Count of elements : 2014
Stream size : 69.1 KiB (0%)
Title : Korean
Language : Korean
Default : No
Forced : No

Text #30
ID : 32
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.239 FPS
Count of elements : 1987
Stream size : 63.0 KiB (0%)
Title : Malay
Language : Malay
Default : No
Forced : No

Text #31
ID : 33
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 63 b/s
Frame rate : 0.230 FPS
Count of elements : 1911
Stream size : 64.2 KiB (0%)
Title : Norwegian Bokmål
Language : Norwegian Bokmal
Default : No
Forced : No

Text #32
ID : 34
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 61 b/s
Frame rate : 0.234 FPS
Count of elements : 1951
Stream size : 62.8 KiB (0%)
Title : Polish
Language : Polish
Default : No
Forced : No

Text #33
ID : 35
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 68 b/s
Frame rate : 0.238 FPS
Count of elements : 1982
Stream size : 69.3 KiB (0%)
Title : Portuguese
Language : Portuguese
Default : No
Forced : No

Text #34
ID : 36
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 64 b/s
Frame rate : 0.239 FPS
Count of elements : 1990
Stream size : 65.3 KiB (0%)
Title : Portuguese Brazilian
Language : Portuguese
Default : No
Forced : No

Text #35
ID : 37
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 82 b/s
Frame rate : 0.305 FPS
Count of elements : 2544
Stream size : 83.7 KiB (0%)
Title : Portuguese Brazilian [SDH]
Language : Portuguese
Default : No
Forced : No

Text #36
ID : 38
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 66 b/s
Frame rate : 0.237 FPS
Count of elements : 1974
Stream size : 68.0 KiB (0%)
Title : Romanian
Language : Romanian
Default : No
Forced : No

Text #37
ID : 39
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 105 b/s
Frame rate : 0.238 FPS
Count of elements : 1984
Stream size : 108 KiB (0%)
Title : Russian
Language : Russian
Default : No
Forced : No

Text #38
ID : 40
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 65 b/s
Frame rate : 0.236 FPS
Count of elements : 1969
Stream size : 66.5 KiB (0%)
Title : Spanish
Language : Spanish
Default : No
Forced : No

Text #39
ID : 41
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 13 min
Bit rate : 84 b/s
Frame rate : 0.284 FPS
Count of elements : 2268
Stream size : 82.6 KiB (0%)
Title : Spanish [SDH]
Language : Spanish
Default : No
Forced : No

Text #40
ID : 42
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 66 b/s
Frame rate : 0.224 FPS
Count of elements : 1861
Stream size : 67.3 KiB (0%)
Title : Swedish
Language : Swedish
Default : No
Forced : No

Text #41
ID : 43
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 163 b/s
Frame rate : 0.240 FPS
Count of elements : 1996
Stream size : 166 KiB (0%)
Title : Thai
Language : Thai
Default : No
Forced : No

Text #42
ID : 44
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 71 b/s
Frame rate : 0.231 FPS
Count of elements : 1920
Stream size : 72.4 KiB (0%)
Title : Turkish
Language : Turkish
Default : No
Forced : No

Text #43
ID : 45
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 19 min
Bit rate : 89 b/s
Frame rate : 0.275 FPS
Count of elements : 2296
Stream size : 91.1 KiB (0%)
Title : Turkish [SDH]
Language : Turkish
Default : No
Forced : No

Text #44
ID : 46
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 106 b/s
Frame rate : 0.239 FPS
Count of elements : 1994
Stream size : 108 KiB (0%)
Title : Ukrainian
Language : Ukrainian
Default : No
Forced : No

Text #45
ID : 47
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 2 h 18 min
Bit rate : 82 b/s
Frame rate : 0.237 FPS
Count of elements : 1972
Stream size : 84.3 KiB (0%)
Title : Vietnamese
Language : Vietnamese
Default : No
Forced : No

8

Okay, so let’s start from the beginning.
Your log showed it is using hw decoding.

1. Video:
2. Codec: hevc (HEVC (High Efficiency Video Coding))
3. Size: ? x ?
4. Duration: 8462.75
5. FPS (container): 24.00
6. FPS (filters): 0.00
7. Aspect: 1.78
8. Bitrate: ?
9. Display FPS: 24.00
10. Hardware Decoding: d3d11va ( d3d11va )

1. Jan 04, 2023 02:57:59.476 [3784] DEBUG - [MPVEngine/mpv] vd: Trying hardware decoding via hevc-d3d11va.

This is weird. Was this the file that played slowly and desync?

Sorry, my fault. gpu-context needs be winvk and gpu-api needs be vulkan (although the latter is not necessarily needed for testing). Can you please try again? (so see if vulkan/nvdec also works)

mpv.com your-file.mkv -vo=gpu-next -hwdec=nvdec -gpu-context=winvk -v

9

Indeed the shipped mpv build includes a commit that has not been merged upstream.

However, if you like you can use my mpv build, as it includes the commit. =>

Thanks for the mediainfo output.

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
HDR format : SMPTE ST 2086, HDR10 compatible
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 h 19 min
Bit rate : 19.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 24.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 2)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.095
Stream size : 18.5 GiB (96%)
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: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 740 cd/m2
Maximum Frame-Average Light Level : 106 cd/m2

The file is nothing special and should be decoded just fine. (as you already tested with mpv)

Do you have some special settings made in the Plex HTPC settings section? It sounds like you have Experimental HDR passthrough enabled. On my system, I noticed many dropped frames with d3d11. Have a look at this thread.

10

yes. I deleted the logs, ran plex htpc, selected the problematic movie, played it for one second and noticed the slow playback, exited the app as fast as I could to create as small of a log file as I could. then copy pasted the new log created into pastebin.

Plays fine in vulkan apart from about 34 dropped frames at the beginning as everything loads.

Hell yeah, and that’ll sort the issue for me. However the root cause of this is unknown though!

yeah I’ve enabled and disabled it during testing and the hdr passthrough had no effect on the playbility of this file. Other than that I have it setup for audio passthrough through hdmi and ticked all the options as my avr handles them all nativly (denon 3700h). No other fancy settings enabled. Ill try to revert back to the normal dll and reset the app settings and try again and report back. Thanks again for all your help!!!

11

ok i reverted to app defaults, replaced the normal mpv.dll included in the install an tried again. Still desyncing and here’s the new log just for posterity’s sake

12

Okay, well there is something wrong

1. Jan 05, 2023 04:47:00.052 [6444] WARN - [MPVEngine/mpv] cplayer:
2. Jan 05, 2023 04:47:00.052 [6444] WARN - [MPVEngine/mpv] cplayer: Audio/Video desynchronisation detected! Possible reasons include too slow
3. Jan 05, 2023 04:47:00.052 [6444] WARN - [MPVEngine/mpv] cplayer: hardware, temporary CPU spikes, broken drivers, and broken files. Audio
4. Jan 05, 2023 04:47:00.052 [6444] WARN - [MPVEngine/mpv] cplayer: position will not match to the video (see A-V status field).
5. Jan 05, 2023 04:47:00.052 [6444] WARN - [MPVEngine/mpv] cplayer:
6. Jan 05, 2023 04:47:11.381 [8188] INFO - Debug info:

7. File:
8. URL: http://192.168.1.237:32400/...
9. Container: mkv
10. Native seeking: yes

* Video:
11. Codec: hevc (HEVC (High Efficiency Video Coding))
12. Size: 3840 x 2160
13. Duration: 8462.75
14. FPS (container): 24.00
15. FPS (filters): 24.00
16. Aspect: 1.78
17. Bitrate: 21,762,217
18. Display FPS: 60.00
19. Hardware Decoding: d3d11va ( d3d11va )

* Audio:
...

* Cache:
...

* Misc:
29. Seekable: true
...
33. Frame drop count: 191
34 Time:  15.50  /  8462.75  ( 0.18 %) 
35. State: playing

191 dropped frames within 15 seconds with hw decoding one???.. Thats not normal. How is your CPU and GPU utilization? Can you try to set your Video quality to low in the Plex HTPC settings? (doesnt mean the image will look bad, only some gpu-heavy filters are not applied then)

Please also try to:
add
vo=gpu-next to the mpv.conf → How does it behave?

Try vulkan instead, as it can be more performant:
add:

vo=gpu-next
gpu-api=vulkan
gpu-context=winvk
13

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