List of Supported devices

[gtb]

Is there anyway I can tell if my device is handling AC-4 directly or being transcoded?

If you really want to know, you can probably turn on flow instrumentation on better routers to see the traffic metrics. If your router does not have that capability, you could probably use a brute force approach and disconnect your Internet service at the router and see if the audio continues to play (not sure if the app will deal well with losing it's connection to the Internet).

I do agree that having playback information available in a user accessible diagnostic screen would be occasionally useful (like the "stats for nerds" in YouTube).

[foxbat121]

Is there anyway I can tell if my device is handling AC-4 directly or being transcoded?

If you really want to know, you can probably turn on flow instrumentation on better routers to see the traffic metrics. If your router does not have that capability, you could probably use a brute force approach and disconnect your Internet service at the router and see if the audio continues to play (not sure if the app will deal well with losing it's connection to the Internet).

I do agree that having playback information available in a user accessible diagnostic screen would be occasionally useful (like the "stats for nerds" in YouTube).

Actually, today's SD outage proved to be a perfect chance to test it using the ATSC 3.0 recordings. Only the device that support local AC-4 handling can playback the recordings in HDHR app. Those that can't will not be able to play any of these recordings in HDHR app.

[nickk]

Rocktek G2 supports AC4 via smart-passthrough mechanism.

Can you please test the Sony again, this time restarting the app after enabling "send diagnostic information".

[foxbat121]

Thanks for confirming that.

I did another test this morning:
7:05AM Sony X900H
7:15AM T-Vision Hub v2 (from T-Mobile).

Hopefully this time the diagnostic info is sent successfully.

[nickk]

Sony X900H supports AC4 via smart-passthrough mechanism.

Not seeing the startup diagnostic information from the T-Vision Hub v2

[foxbat121]

Thanks again.

Just launched the T-Vision Hub v2 device again at 2:08PM EDT. Not sure if this time the information is sent.

[nickk]

T-Vision Hub v2 supports AC4 via smart-passthrough mechanism.

[foxbat121]

Thanks. That means I have 3 different devices that can handle AC-4 and could save SD some cloud transcoding costs

[emveepee]

I just tried a player Rocktek G2 and it seems to support AC-4 via ExoPlayer. My device is against 103B4218 and 10529531 but I played from a DVR test and would be interested in know how AC-4 is played back on this device. Logcat shows

Code: Select all

06-07 10:34:53.112   338  4608 D libdolbyms12: ************** Dolby MultiStreamDecoder Version 2.4.1 **************
06-07 10:34:53.113   338  4608 D libdolbyms12: 
06-07 10:34:53.113   338  4608 D libdolbyms12: Unpublished work.  Copyright 2003-2021 Dolby Laboratories, Inc. and
06-07 10:34:53.113   338  4608 D libdolbyms12: Dolby Laboratories Licensing Corporation.  All Rights Reserved.
06-07 10:34:53.113   338  4608 D libdolbyms12: 
06-07 10:34:53.113   338  4608 D libdolbyms12: USE OF THIS SOFTWARE IS SUBJECT TO A LEGAL AGREEMENT BETWEEN YOU AND DOLBY
06-07 10:34:53.113   338  4608 D libdolbyms12: LABORATORIES. DO NOT USE THIS SOFTWARE UNLESS YOU AGREE TO THE TERMS AND 
06-07 10:34:53.113   338  4608 D libdolbyms12: CONDITIONS IN THE AGREEMENT.  BY USING THIS SOFTWARE, YOU ACKNOWLEDGE THAT 
06-07 10:34:53.113   338  4608 D libdolbyms12: YOU HAVE READ THE AGREEMENT AND THAT YOU AGREE TO BE BOUND BY ITS TERMS. 
06-07 10:34:53.113   338  4608 D libdolbyms12: 
06-07 10:34:53.113   338  4608 I libdolbyms12: atmos_lock 0
06-07 10:34:53.113   338  4608 D libdolbyms12: -----------------------------------------------------------
06-07 10:34:53.113   338  4608 D libdolbyms12:   USE CASE:
06-07 10:34:53.113   338  4608 D libdolbyms12:   OTT SIGNAL PROCESSING GRAPH
06-07 10:34:53.113   338  4608 D libdolbyms12:   DOLBY AC4 TRANSCODING - SINGLE INPUT
06-07 10:34:53.113   338  4608 D libdolbyms12: -----------------------------------------------------------
06-07 10:34:53.113   338  4608 D libdolbyms12:   HDMI output type:                 Full HDMI
06-07 10:34:53.113   338  4608 D libdolbyms12:   Connected AVR/TV:                 non-ATMOS
06-07 10:34:53.113   338  4608 D libdolbyms12: -----------------------------------------------------------
06-07 10:34:53.113   338  4608 D libdolbyms12:   System Sound Mixing:              on
06-07 10:34:53.113   338  4608 D libdolbyms12:   Application Sound Mixing:         on
06-07 10:34:53.113   338  4608 D libdolbyms12:   UI Sound Mixing:                  off
06-07 10:34:53.113   338  4608 D libdolbyms12:   File playback:                    off
06-07 10:34:53.113   338  4608 D libdolbyms12:   Always Audio Out:                 on
06-07 10:34:53.113   338  4608 D libdolbyms12:   Channel Mode Locking:             off
06-07 10:34:53.113   338  4608 D libdolbyms12:   Dolby Atmos Lock:                 off
06-07 10:34:53.113   338  4608 D libdolbyms12:   UDC Enforce Timeslice:            off
06-07 10:34:53.113   338  4608 D libdolbyms12: -----------------------------------------------------------
06-07 10:34:53.113   338  4608 D libdolbyms12:   Parameter Settings:
06-07 10:34:53.113   338  4608 D libdolbyms12: -----------------------------------------------------------
06-07 10:34:53.113   338  4608 D libdolbyms12:   Input Bitstream Main:               /data/main.ac4
06-07 10:34:53.113   338  4608 D libdolbyms12:   Input Wavefile System Sound:        /data/system48000Hz.wav
06-07 10:34:53.113   338  4608 D libdolbyms12:   Input Wavefile Application Sound:   /data/app48000Hz.wav
06-07 10:34:53.113   338  4608 D libdolbyms12:   AC3 output bitstream:               /data/output.ac3
06-07 10:34:53.113   338  4608 D libdolbyms12:   EC3 output bitstream:               /data/output.ec3
06-07 10:34:53.113   338  4608 D libdolbyms12:   PCM Stereo Downmix Output Main:     /data/outputdownmix.wav
06-07 10:34:53.113   338  4608 D libdolbyms12:   PCM MC Output is:                   active
06-07 10:34:53.113   338  4608 D libdolbyms12:   RF mode (affects 2ch only):         on
06-07 10:34:53.113   338  4608 D libdolbyms12:   Downmix type (2ch):                 LtRt
06-07 10:34:53.113   338  4608 D libdolbyms12:   DRC cut/boost factor (2ch):         0%, 0%
06-07 10:34:53.113   338  4608 D libdolbyms12:   DRC cut/boost factor (6 or 8ch):    0%, 0%
06-07 10:34:53.113   338  4608 D libdolbyms12:   AD Mixing:                          off
06-07 10:34:53.113   338  4608 D libdolbyms12:   System/Appication sound  Mixing:    on
06-07 10:34:53.113   338  4608 D libdolbyms12:   AD Mixing User Balance:             0dB
06-07 10:34:53.113   338  4608 D libdolbyms12:   Prefer Assoc. Type over Language:   yes
06-07 10:34:53.113   338  4608 D libdolbyms12:   Verbose mode:                       2
06-07 10:34:53.113   338  4608 D libdolbyms12:   Evaluation mode:                    off

Martin

[nickk]

ms12 is the Dolby transcode library. You pass AC4 audio to the audio output device as if it were AC4 passthrough and this library converts it to AC3 for AC3 passthrough (or PCM for PCM output).

[emveepee]

ms12 is the Dolby transcode library. You pass AC4 audio to the audio output device as if it were AC4 passthrough and this library converts it to AC3 for AC3 passthrough (or PCM for PCM output).

So will this go to your transcoding server or will it always go through passthrough, independently from the app's speaker configuration?

Martin

[nickk]

So will this go to your transcoding server or will it always go through passthrough, independently from the app's speaker configuration?

ms12 is transcoding built into the device - no server involved.

The HDHomeRun app uses the AC4 system codec if present. Next the HDHomeRun app uses AC4 passthrough if present (ie the ms12 transcode on the local device). Finally if there are no other options the HDHomeRun app uses our cloud transcode service.

Nick

[MikeBear]

Does the Roku Ultra 4802R handle AC-4 audio from ATSC 3.0? I think it's a slightly newer version than the 4800x.

[jasonl]

4802R is the 2022 Ultra model, which should support AC-4.

[DennisFL]

So will this go to your transcoding server or will it always go through passthrough, independently from the app's speaker configuration?

ms12 is transcoding built into the device - no server involved.

The HDHomeRun app uses the AC4 system codec if present. Next the HDHomeRun app uses AC4 passthrough if present (ie the ms12 transcode on the local device). Finally if there are no other options the HDHomeRun app uses our cloud transcode service.

Nick

So, if I have an app that uses HDHome Run Flex 4K (like Channels DVR, for instance)......do they get the benefit of the cloud AC4?