10.0.1 - 4K and DTS playback issue

silentsound · November 7, 2021 at 11:59 AM

Hello all, I mentinoed this in an another thread but came back with some more data. First, the log: http://ix.io/3EhN

Basically, 4K files with DTS\DTS HD soundtracks go out of out sync after a few minutes and become unwatchable. I've swtiched over to using a sigle HDMI directly through my soundbar yet that still chokes the system. On the other hand, files with Dolby HD audio even with HDR play flawlessly. With my limited knowledge on the topic, it's either a DTS issue or bandwith (files are not compressed in anyway, played from my NAS). Any help or ideas welcome!

**Da Flex** · November 7, 2021 at 1:20 PM

Same issue when using the default skin?

silentsound · November 7, 2021 at 1:59 PM

Yes, even with the default skin. By pure read speed, I still should have enough overhead.

My NAS averages at 10 MB\s read speed.

A 4K file I'm trying to play with 57 Mb\s video steam spped with DTS is stuttering.

A file at 60Mb\s with Dolby HD and HDR is giving me no issues.

I've also played the same problematic file directly from a USB directly connected to the Pi 4. It mostly fixed the issue but there were still some stuttering to be found.

**Da Flex** · November 7, 2021 at 2:12 PM

You're still at log level 0. So...

Please provide a full debug log.

How to post a log (wiki)

1. Enable debugging in Settings>System Settings>Logging
2. Restart Kodi
3. Replicate the problem
4. Generate a log URL (do not post/upload logs to the forum)

use "Settings > LibreELEC > System > Paste system logs" or run "pastekodi" over SSH, then post the URL link

silentsound · November 7, 2021 at 3:02 PM

I think I managed to get a more detailed one:

http://ix.io/3EiM

**Da Flex** · November 7, 2021 at 3:10 PM

PS: The current log says that LE can't handle dtsHD correctly:

Code

2021-11-07 18:09:40.470 T:949      INFO <general>: CAEStreamParser::SyncDTS - dtsHD MA stream detected (8 channels, 48000Hz, 16bit BE, period: 8192, syncword: 0x41a29547, target rate: 0x18, framesize 2100))
2021-11-07 18:09:40.470 T:949      INFO <general>: CVideoPlayerAudio: display reset occurred, checking for passthrough
2021-11-07 18:09:40.470 T:949      INFO <general>: Creating audio stream (codec id: 86020, channels: 8, sample rate: 48000, pass-through)
2021-11-07 18:09:40.472 T:830      INFO <general>: CActiveAESink::OpenSink - initialize sink
2021-11-07 18:09:40.472 T:830      INFO <general>: CAESinkALSA::Initialize - Attempting to open device "hdmi:CARD=vc4hdmi0,DEV=0"
2021-11-07 18:09:40.476 T:949     ERROR <general>: CAEStreamInfo::GetDuration - invalid stream type
2021-11-07 18:09:40.478 T:830      INFO <general>: Skipped 1 duplicate messages..

The "display reset" is weired. Maybe your HDMI cable doesn't support high data rate, which is definitely the case when playing 4K / dtsHD. Make sure your HDMI cable is conform to HDMI 2.0 / 2.1 standard.

silentsound · November 8, 2021 at 9:54 AM

Quote from Da Flex

The "display reset" is weired. Maybe your HDMI cable doesn't support high data rate, which is definitely the case when playing 4K / dtsHD. Make sure your HDMI cable is conform to HDMI 2.0 / 2.1 standard.

Thanks for that. I checked, both cables are marked as 'High Speed'. As I use both HDMI outputs, I swapped the two cables around, tried using one directly into the soundbar but the issue still persits in some way or another

. I have lowered the UI resolution from 1080 to 720 and... it feels a bit better? Could placebo though.

**Da Flex** · November 8, 2021 at 1:45 PM

Thanks. Could be a DRM Prime issue:

Code

2021-11-07 23:33:02.876 T:942     DEBUG <general>: SeekTime - seek ended up on time 1840339
2021-11-07 23:33:02.876 T:942     DEBUG <general>: CVideoPlayer::FlushBuffers - flushing buffers
2021-11-07 23:33:02.876 T:950     DEBUG <general>: CDVDAudio::Pause - pausing audio stream
2021-11-07 23:33:02.876 T:949     DEBUG <general>: CDVDVideoCodecDRMPRIME::Reset - flush buffers
2021-11-07 23:33:02.876 T:949     DEBUG <general>: CVideoPlayerVideo - CDVDMsg::GENERAL_SYNCHRONIZE
2021-11-07 23:33:02.876 T:950     DEBUG <general>: CVideoPlayerAudio - CDVDMsg::GENERAL_SYNCHRONIZE
2021-11-07 23:33:02.876 T:942     DEBUG <general>: CVideoPlayer::SetCaching - caching state 1
2021-11-07 23:33:02.876 T:950     DEBUG <general>: CDVDAudio::Pause - pausing audio stream
2021-11-07 23:33:02.876 T:942     DEBUG <general>: CDVDClock::SetSpeedAdjust - adjusted:0.000000
2021-11-07 23:33:02.876 T:942     DEBUG <general>: Prepare - starting demuxer from: 1841000
2021-11-07 23:33:02.878 T:822     DEBUG <general>: CWinSystemGbmGLESContext::PresentRender - Sending display reset to all clients
2021-11-07 23:33:02.878 T:822      INFO <general>: VideoPlayer: OnResetDisplay received
2021-11-07 23:33:02.878 T:950     DEBUG <general>: CVideoPlayerAudio - CDVDMsg::GENERAL_PAUSE: 0
2021-11-07 23:33:02.878 T:949     DEBUG <general>: CVideoPlayerVideo - CDVDMsg::GENERAL_PAUSE: 0
2021-11-07 23:33:02.926 T:942     DEBUG <general>: CVideoPlayer::HandleMessages - player 2 reported state: 0
2021-11-07 23:33:02.926 T:842     DEBUG <general>: OnAVChange: CApplication::OnAVChange
2021-11-07 23:33:02.926 T:942     DEBUG <general>: CVideoPlayer::HandleMessages - player 1 reported state: 0
2021-11-07 23:33:02.945 T:942     DEBUG <general>: CheckPlayerInit - dropping packet type:2 dts:1840339000.000000 to get to start point at 1841000000.000000
2021-11-07 23:33:02.945 T:949     DEBUG <general>: CVideoPlayerVideo - Stillframe left, switching to normal playback
2021-11-07 23:33:02.951 T:942     DEBUG <general>: CheckPlayerInit - dropping packet type:1 dts:1840338000.000000 to get to start point at 1841000000.000000
2021-11-07 23:33:02.988 T:942      INFO <general>: Skipped 74 duplicate messages..

Display More

I'll ping a dev...

silentsound · November 8, 2021 at 11:46 PM

Thanks again for stopping by and looking at this, much apprichiated!

**Da Flex** · November 9, 2021 at 8:58 PM

A little research says that "HDMI High-Speed" is lower than HDMI 2.0. Because you have several "display reset" messages on your logs, I highly recommend to use an "HDMI Premium High-Speed" cable, which is available as HDMI 2.0 or HDMI 2.1 variant.

silentsound · November 13, 2021 at 9:10 AM

Hi again, thanks for the suggestion. I've got a new set of cables but... it's still happening. Do you see anything new in the log?

http://ix.io/3ERc

**HiassofT** · November 13, 2021 at 9:56 AM

Please provide a short sample file (1 minute or so) that has this issue. Also please test that if the issue occurs too when playing from a local USB drive to rule out network/nfs issues.

so long,

Hias

**Da Flex** · November 13, 2021 at 5:49 PM

go to LE's audio settings and activate expert mode
activate DTS inside the pass-through settings

silentsound · November 14, 2021 at 8:25 AM

Here's the latest:

Playing just DTS (rather than DTS-HD) still doesn't play smoothly
Playing DTS-HD from a drive directly connected to the device, success!

So I guess a bandwidth problem with my NAS/nfs?

I don't know the specifics between DTS and Dolby but Dolby True HD 4K files play from the NAS without any issues.

**Da Flex** · November 14, 2021 at 4:42 PM

Quote from silentsound

Playing just DTS (rather than DTS-HD) still doesn't play smoothly

Did you also used direct USB (blue port) connection for this test?

silentsound · November 15, 2021 at 9:05 AM

Quote from Da Flex

Did you also used direct USB (blue port) connection for this test?

NAS: Both DTS/DTS-HD go out of sync within a minute or two
Directly via USB: Both DTS/DTS-HD play smoothly.

**Da Flex** · November 15, 2021 at 2:32 PM

Quote from silentsound

My NAS averages at 10 MB\s read speed.

Read the CODEC specs. Add max. 4K video data rate and max. DTS (HD) audio data rate. Buffering is a workaround for some peaks, but all in all your NAS is too slow.

10.0.1 - 4K and DTS playback issue

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