TrueHD with Dolby Atmos 7.1 sound skipping (11Mbps audio bit rate)

Shield now passes this correctly through Plex and soon Kodi. Hopefully others will follow.

This is just a specific workaround for the Shield. It’s not possible in CE, and Kodi is still working on fixing it properly in ffmpeg so that it works on all platforms.

There’s a Kodi dev working on the fix, so hopefully we’ll see this in 18.6. Looks definite for Kodi 19.0.

I am using CE 19.2 RC2 with S905X3 4GB ram target, the issue still appear.

From my investigation, the same video file if change audio stream from TrueHD Atmos to e.g DTS-ma, DD surround etc the skip not appear.

This is a Kodi issue.

I’ve been following discussions about this bug over at Kodi GitHub and it seems a temporary, partial remedy for the problem exists in commits but has not been integrated in Kodi yet.
See this: Kodi 18.4 crashes with high bitrate TrueHD+Atmos audio stream · Issue #16704 · xbmc/xbmc · GitHub

Apologies in advance if what I’m about to ask is impossible. I’m not a dev. But I’m wondering if there is any way CoreELEC could integrate those fixes in the CoreELEC version of Kodi until they are implemented officially?

This bug has been open in Kodi for nearly 2 years and it seems like the Kodi devs have all but given up on it. However, as more and more films are released with higher Dolby Atmos bitrates this is becoming a major problem. I’ve been noticing audio dropouts on more and more of my disk rips lately.

I’m sure fixing this would mean a lot to many users.

@bendavid is here with us, maybe he has some more insight into this problem now.

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This problem is driving me crazy too.

I wish that I had the programming ability to incorporate the reported fixes into Kodi.

There are more and more atmos soundtracks it Renders a core function of Kodi completely broken.

Yeah, and considering how long this keeps being a issue, I would say it isn’t easily solvable (if at all). This and the DV layer playback status (I get why it probably never will be done, but still) sure are significant blows to everything Kodi at the moment.

I myself was seriously eyeing a S922X box as an upgrade path for my S912… but it seems I’m better off looking for alternatives.

Last night I ran into this problem for the first time when attempting to watch Free Guy.

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Same here, Free Guy (UHD version with Atmos track) is the first time I experienced these drop-outs.
When comparing it with other movies it has indeed an above average high bitrate Dolby TrueHD / Atmos track.

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Free guy was the movie that triggered my most recent annoyance too.

Most movies it only happened once or twice and I can live with it. But free guy was unwatchable until I turned off bitstreaming which made kodi send 7.1 pcm instead ( losing the atmos )

It’s ok for me to do that. But my family wouldn’t know what the problem was more the workaround.

I would pay the kodi Devs if they could fix this

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Both of those issues should be solvable. Other software players are able to do them. The DV one requires compatible hardware so is trickier but as I said other software players do it. The atmos one is already fixed in many software players including ffmpeg so kodi need to get onto it.

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I agree that they “should” but it will take time (well, it already is taking, isn’t it?). Of course, we can’t really expect it to be any faster because of the nature of the project. Official Kodi HDR support took more than 2 years to be done, and honestly I’m surprised it didn’t take longer.

Those boxes usually are considered obsolete in 3, 4 years max (just see that happened to the non-ng Amlogic SOCs). That means you better buy something that satisfies your needs today, or you risk wasting the better half of the lifetime of this gadget just waiting for some coding hero to come along.

In a utopian world everyone wanting to use Kodi would be a programmer able to help with the project, but we know how it really is…

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You’re right. Team Kodi have no interest in this issue. They have locked the ticket on GitHub to Devs only which is their right of course. Also stated that no one is working on it. I did politely try and reach out to the dev who has it assigned to them but I haven’t heard anything from them.

For now I’ll have to program a simple button in to my remote system that toggles bitstream Audio on and off. I’m sure I can code that via the Kodi api

X96max plus had same problem when play free guy. No problem with sound track DTS HD-MA. But DTS will lose Atoms channel :weary:

The problem isn’t with the atmos soundtrack itself. The problem is the long known about bug in the way Kodi packs the truehd soundtrack into the bitstream. I don’t have enough coding skills to fix it sadly. That is why DTS HD-MA works fine. Also you can use the atmos track but turn off bitstreaming and send 7.1 PCM audio instead which Kodi decodes. Both ways will get essentially the same audio (ie no discrete overheads). Fortunately I have a Trinnov processor on which the upmixing is very good but I would still prefer proper atmos to work. Hopefully with more and more atmos tracks team kodi can work on fixing this. They definitely know what the case of the bug is but they have said it’s a big job to fix it :frowning:

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Some good news. Kodi dev has got a working patch. It’s not yet finished but early work is promising and seems to play free guy without dropouts.

Hopefully it will be incorporated into a née release of Kodi soon.


Source for this claim?