DTS passthrough/converting problems

[frk1337 4]

I started using Emby some days ago and so far love it!

 

But I encountered problems when playing DTS-HD streams. Audio-passthrough to my receiver works for some time (~10-20s), then suddenly the picture freezes and my receiver shows the input signal switched from DTS:X to "ANALOG". After 10s this will go away and DTS:X starts to appear again though with a noticeable av-desync.

 

No problems occur when playing Dolby Atmos/EAC3/AC3/Opus files.

 

The problem does not occur (same file!) with Plex or Emby for Kodi. With those passthrough works without any problem.

 

Disabling DTS passthrough leads to Emby transcoding the DTS-HD Master or DTS:X to ac3 but those start to glitch aswell.

 

I then tested a backup audio stream (DTS audio encoded in Opus) as fallback.

Even when I used this audio line (file had two audio lines; 0: DTS-HD, 1: Opus) it bugged and glitched.

 

My suspicion: when DTS is available in the container something about the android tv app can't handle it.

 

Device: Nvidia Shield 2019

Receiver: Onyko TX-NR686

App-Version: Latest beta from Google Play Store

 

Logfile attached (ip adresses replaced with 0.0.0.0).

 

embyserver.txt

Edited February 3, 2020 by frk1337

[frk1337 4]

To rule out a corrupt file I tried a second file from a totally different source (one was DTS-HD 5.1 the other was DTS:X 7.1). Both showed exactly the same buggy behaviour.

[ebr 16184]

App-Version: Latest beta from Google Play Store

 

Hi.  As we note in our How to Report a Problem instructions - that doesn't tell us for sure what version you are using (maybe your device missed an update).  Please provide the version number shown on the settings page for the app.

 

Also, please cause this issue by playing just long enough for it to happen and then send a log from the app.

 

Thanks.

[frk1337 4]

I just used the debug feature on the app to send you logs.

 

Time: 1580740456

(15:34 local german time; UTC -5 = 09:34)

Local user: max

 

App version: Version 1.7.78g Registered

Server version: 4.3.1.0

Edited February 3, 2020 by frk1337

[ebr 16184]

The DTS part may be a red herring. I don't see any problems here except what looks like some buffering happening - which could cause your receiver to go in and out of bitstreaming mode during the pause.

 

What is the bitrate of the item in question?  What are all the connections involved?

[frk1337 4]

General
Unique ID                                : 187105313867094030857354210258869389809 (0x8CC32C344D3D5802A1645DAF1A3989F1)
Complete name                            : XXX
Format                                   : Matroska
Format version                           : Version 4
File size                                : 47.1 GiB
Duration                                 : 2 h 10 min
Overall bit rate mode                    : Variable
Overall bit rate                         : 51.7 Mb/s
Encoded date                             : UTC 2020-02-03 04:45:30
Writing application                      : mkvmerge v43.0.0 ('The Quartermaster') 64-bit
Writing library                          : libebml v1.3.10 + libmatroska v1.5.2

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : V_MPEGH/ISO/HEVC
Duration                                 : 2 h 10 min
Bit rate                                 : 46.7 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.235
Stream size                              : 42.5 GiB (90%)
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: 0.0050 cd/m2, max: 4000 cd/m2
Maximum Content Light Level              : 500 cd/m2
Maximum Frame-Average Light Level        : 200 cd/m2

Audio #1
ID                                       : 2
Format                                   : DTS XLL X
Format/Info                              : Digital Theater Systems
Commercial name                          : DTS-HD Master Audio
Codec ID                                 : A_DTS
Duration                                 : 2 h 10 min
Bit rate mode                            : Variable
Bit rate                                 : 3 787 kb/s
Channel(s)                               : 8 channels
Channel(s)_Original                      : Object Based
ChannelLayout_Original                   : Object Based
Sampling rate                            : 48.0 kHz
Frame rate                               : 93.750 FPS (512 SPF)
Bit depth                                : 24 bits
Stream size                              : 3.45 GiB (7%)
Language                                 : English
Default                                  : Yes
Forced                                   : No

Connnection is 5GHz WLAN with net bandwith ~600-800mbit/s.

 

First I thought about a buffering issue too. Doesn't explain why the sound get's asynced when it resumes.

Why can Plex and Emby @ Kodi play it without any issues?

 

Movies with 70mb/s and Atmos play fine through the app too. So I think the connection is stable enough.

[ebr 16184]

It could be the extremely high audio bitrate coupled with the high video bitrate.  This is showing 3.7Mb/s for the audio where most HD audio is only 1.5. 

[frk1337 4]

Most Atmos streams have higher bitrate, e.g. (video has 45mb/s aswell):

Audio #1
ID                                       : 3
Format                                   : MLP FBA 16-ch
Format/Info                              : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Codec ID                                 : A_TRUEHD
Duration                                 : 2 h 1 min
Bit rate mode                            : Variable
Bit rate                                 : 5 013 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 1 200.000 FPS (40 SPF)
Compression mode                         : Lossless
Stream size                              : 4.30 GiB (8%)
Title                                    : xxxx
Language                                 : English
Default                                  : Yes
Forced                                   : No
Number of dynamic objects                : 13
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Then again, if it was bandwith related: why can plex and Emby for Kodi handle it without any problems?

Edited February 3, 2020 by frk1337

[ebr 16184]

Most Atmos streams have higher bitrate, e.g. (video has 45mb/s aswell):

Audio #1
ID                                       : 3
Format                                   : MLP FBA 16-ch
Format/Info                              : Meridian Lossless Packing FBA with 16-channel presentation
Commercial name                          : Dolby TrueHD with Dolby Atmos
Codec ID                                 : A_TRUEHD
Duration                                 : 2 h 1 min
Bit rate mode                            : Variable
Bit rate                                 : 5 013 kb/s
Channel(s)                               : 8 channels
Channel layout                           : L R C LFE Ls Rs Lb Rb
Sampling rate                            : 48.0 kHz
Frame rate                               : 1 200.000 FPS (40 SPF)
Compression mode                         : Lossless
Stream size                              : 4.30 GiB (8%)
Title                                    : xxxx
Language                                 : English
Default                                  : Yes
Forced                                   : No
Number of dynamic objects                : 13
Bed channel count                        : 1 channel
Bed channel configuration                : LFE

Then again, if it was bandwith related: why can plex and Emby for Kodi handle it without any problems?

 

Because everyone is probably using a different method of passing the audio stream - that is definitely the case with Kodi.

[frk1337 4]

Okay forget everything I said, it just happend the first time with an Atmos file. So you seem to be correct about the buffering problem. I tried upping the Buffer to large in the options, that increased the time until the first occurance but it still happens.

 

Hmm. Buffer too small?

 

As said, never had problems with Kodi or Plex so the bandwith itself seems to be sufficient.

Edited February 3, 2020 by frk1337

[frk1337 4]

Clearing data/cache of the app fixed all issues. I guess the app was "clogged" somehow...

[ebr 16184]

Well, that's very interesting.  Thanks for reporting!