Possible MPV True-HD bitstreaming audio dropout on seek fix?

[Mahinepua 49]

Just came across this post

https://github.com/mpv-player/mpv/issues/13996https://github.com/mpv-player/mpv/issues/13996

I believe it’s a bug in ffmpeg causing it but would increasing or reducing the wasapi audio buffer size fix the problem?

This has been a problem for a long time when ff/rw etc audio drops out on hdmi bitstream but only affects truehd.

Also affected are certain movies like avatar 2 where audio just stops at the same point.
 

[generiq 234]

Here's a report of the issue and probable ffmpeg patch to 'fix' it

https://github.com/mpv-player/mpv/issues/11910

[Mahinepua 49]

Good spotting generiq, softworkx can this fix be applied to Emby?

[Mahinepua 49]

On 1/11/2025 at 8:50 PM, generiq said:

Here's a report of the issue and probable ffmpeg patch to 'fix' it

https://github.com/mpv-player/mpv/issues/11910

Hi Softworkx, just making sure this fix is on your todo list. Truehd bitstreaming desperately need fixing.

[Mahinepua 49]

This is becoming more of a problem on new releases, Underworld Dolbyvision release truehd audio just stops at certain points like avatar 2. Swapped to the dtd-hd soundtrack as a solution.

This needs fixing as a priority, currently having to swap to another player for affected movies.

[Mahinepua 49]

 

[Mahinepua 49]

Kodi solution based on lav fix?

https://forum.kodi.tv/showthread.php?tid=377117

 

[Mahinepua 49]

Is this fix relevant?

https://github.com/CoreELEC/xbmc/commit/f6c62bb959f24bc237d7ed8a552aa8f834afc8a0

 

[Mahinepua 49]

Ffmpeg Bug report and fixes

https://trac.ffmpeg.org/ticket/9569

 

Edited January 14 by Mahinepua

[Mahinepua 49]

MPV plex build to fix the issue.

 https://forums.plex.tv/t/dolby-truehd-passthrough-modified-mpv-build/802742/290

@softworkz

 

[Mahinepua 49]

Patched MPV truehd logic build link

https://github.com/mitzsch/mpv-winbuild/releases/tag/2024-12-07-8d20b72

 

Edited January 14 by Mahinepua

[yocker 89]

@softworkzHey, think this person is trying to get your attention.

[Mahinepua 49]

I’m sure it’s on his todo list, just researching ahead to help as plex users had the same issue and found a work around with a custom MPV build.

I believe the kodi and LAV teams also came up with a solution.

It has become a major issue with more and more releases.

[softworkz 4297]

Thanks. Have you tried one of the patched mpv dlls with Emby?

[Mahinepua 49]

No I haven’t sorry.

[Mahinepua 49]

Have started testing the patched mpv version posted on github and TrueHD bitstreaming is fixed!

https://github.com/mitzsch/mpv-winbuild/releases/tag/2024-12-07-8d20b72

No more issues with audio dropout when seeking or audio stopping on Avatar way of the water or Underworld at the usual time stamps.

I copied the mpv.exe from here https://github.com/mitzsch/mpv-winbuild/releases/download/2024-12-07-8d20b72/mpv-x86_64-v3-20241207-git-bcc89ee.7z and replaced mpv.exe on the portable version generiq gave me for dts-hd testing at Xmas.

Will continue testing, can the fix be included in a new beta for others to test? in the interim the patched portable version attached can be used.

 

 

 

mpv portable fixed.zip

Edited January 14 by Mahinepua

[Mahinepua 49]

Have tested with a number of truehd and atmos movies last night can confirm 100% fixed with the mitzsch patch.

Branch master-3

• This branch features the "new" trueHD passthrough logic
• This branch features the trueHD patch made by @gbooker
• This branch also features a Plex DNS patch
• This branch will be regularly synced with the upstream FFmpeg code

Edited January 15 by Mahinepua

[Mahinepua 49]

Latest build.

https://github.com/mitzsch/mpv-winbuild/releases/tag/2025-01-11-ca211b5

 

[softworkz 4297]

Thanks a lot for all the investigation and testing!

Yes, that sounds all good and promising, but we can't take a build from "somebody" with "some patches" applied - at least not without thorough testing and there's no sufficient activity in the beta group at the moment. The current goal is to consolidate and fix bugs only, having the stable release in focus, and most importantly with the goal to put a checkmark behind the new Win + Xbox apps. There are many other open tasks waiting to get started or waiting for completion, where other users are desparately waiting for.

Updates will happen in "waves" with pauses in-between and the current wave is just ending. We'll see how the situation will be when starting another wave, maybe we'll have a new ffmpeg then and can do a custom mpv build.

For now, I'm glad that you've found a workaround (also for some other users), but please be aware that this is very likely to have drawbacks (= regression issues).

IMPORTANT FOR ALL USERS!

We don't mind you doing experiments and replacing the MPV dll with a different build, but please note that we do not accept bug reports when you have replaced that file!
Before reporting any issues, please replace back the MPV dll with the original one and reproduce the issue with that original lib before reporting.

Thanks!

[Mahinepua 49]

Happy to help.

In the interim I’ve unchecked Truehd bitstreaming in the new theatre as a solution switching to PCM.

The only downside is the atmos stream is stripped out but only one of our theatres has an atmos setup and we can always use MPV or the old Emby Theater with the fixed MPV as an external player.

The fixed ffmpeg for a custom MPV build is at the link above.

Hope it can find its way into the next beta.

Can any of the new theatre files be overwritten with the fixed MPV.exe? There isn’t a MPV DLL file. I couldn’t find the directory where they are installed and similar file names.

 

[softworkz 4297]

7 minutes ago, Mahinepua said:

Can any of the new theatre files be overwritten with the fixed MPV.exe? There isn’t a MPV DLL file. I couldn’t find the directory where they are installed and similar file names.

Emby (the new app isn't called 'theater" anymore) doesn't use the executable. You need the dll  with that patch applied. The file is named mpv.dll and it's in the same folder as the applicatino executable.

[Mahinepua 49]

Oh I searched and couldn’t find a MPV.dll in the new Emby.

Do you know the location?  The patch is within the MPV.exe there is no patched DLL I’m aware of.

What directory are the new Emby files in?

Edited Saturday at 01:57 AM by Mahinepua

[Mahinepua 49]

Have downloaded the dll, what is the emby file/directory path?

[softworkz 4297]

Go to Settings >> About >> WebRoot path. It's the parent folder of it.

[softworkz 4297]

You might need to take ownership of the WindowsApps folder and grant yourself permissions.