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  #1  
Old 01-19-2025, 12:17 PM
aidyhall aidyhall is offline
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Default Offline bounce causes -9173 error on next playback, have to reset Playback Engine

I have consistently been getting a -9173 error after an offline bounce, which causes the system to not be able to playback after the bounce completes. But if I manually flick the Playback Engine buffer size from my default 512 samples to any other setting and back again, then I can playback as normal. I remember this workaround from an old thread, as it seems to somehow reset the Playback Engine even if you don't exit the Playback Engine page, literally just flick it to another setting and back, then I can resume playback.

The error does not happen with a realtime bounce, with all other settings identical. I have trashed Prefs completely using the Prefs 2 trasher. I also thought it might be related to the fact that I am using a HUI controller (the SSL UF8) but it makes no difference if I disable HUI.

Anybody have any similar problems and was able to resolve it?
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Mac Pro 2019 7,1 12-core 3.3Ghz, 96GB RAM, macOS Ventura 13.7.2
ProTools HDX Ultimate 2024.10.2
Avid HD16 i/o, Digidesign Blue 96i/o
UAD Octo PCIe, UAD Octo Thunderbolt 3 Satellite
SSL UF8, SSL UC1

www.adrian-hall.com
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  #2  
Old 01-19-2025, 04:01 PM
Darryl Ramm Darryl Ramm is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

9173 does not give a very specific clue as to the cause.

When did this start happening. Can you recall what changed?

What HD Driver version are you running? In Terminal run

$ kextstat | grep Digi

($ is the shell command prompt, yours will likely be different, you don't type that part)

Just to be super clear the 9173 error always happens separately, after the bounce is finished... when you put the transport in play?

I would be doing troubleshooting....

Does this happen in all sessions? If you start from a new empty session? In case you have a corrupt session or set of related sessions.

Are you using hybrid engine or classic DSP? Be sure to test with classic if using hybrid.

When problems happen with HDX with offline bounce but not online bounce then plugins are a suspect since they switch from HDX (if using DSP) in the online bounce to all using native in the offline bounce. I would try testing with all plugins temporarily moved out of from the plugin folder. Pro Tools will automagically put back the small number of core plugins when it starts. I would try some bounces with only those plugins installed. Use a session that has shown the problem earlier, but now it will have plugins missing, move the plugins it is missing back in batches and see if that trips things up. Yes Pro Tools problems can be caused by plugins not even being used, but here if there is a plugin problem I expect it's one of the ones being used in your session(s) during the bounce.

Does this happen when using the Mac's built in audio output as the playback engine. That's an easy way to exclude or include the HD Driver and HDX hardware as suspects.

Keep getting the system set up as simple as possible, layering on simplification don't undo them at each test, e.g. if it happens with the built in audio then do all other tests just using that.

I would continue to trash prefs between each major troubleshooting step and also test from a newly created macOS admin user account.

There are multiple KB articles about troubleshooting 9173, you should look them up, but I suspect I've covered the important points above.

Still stuck, the Pro Tools log file (~/Library/Logs/Avid/Pro_Tools*.txt) might contain some clues but they are cryptic, look for messages during the bounce as well as the crash.

Still stuck, open a support case with Avid, they will want to log file and more. Post the case number here and that may help it get looked at/help others.
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  #3  
Old 01-19-2025, 05:43 PM
aidyhall aidyhall is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

Hi Darryl, thanks for all of this advice. I will slowly work my way through the various options. It's difficult when I have mixes to do and deadlines to meet!

In answer to your questions, yes, the offline bounce itself works, and I can re-import the bounced audio into the session. But then the first time that I hit play, the transport stops instantly, and I get the -9173 error. Sometimes it gives me a specific plugin, but that plugin changes every time I clear the error and hit play again.

I am running Hybrid Engine, but no plugins are DSP in the mix, literally no load showing on the DSP card in System Usage. I will try with Classic mode and Mac Audio when I get a chance.

And yes, it is happening on a number of different sessions. Interestingly, I've not had this problem before, and I don't remember having this problem with 2024.10.1, I'm pretty sure it started with 2024.10.2.

From the Terminal, the response when I type the kexstat prompt is :

Executing: /usr/bin/kmutil showloaded
No variant specified, falling back to release
191 0 0xffffff7f97114000 0x18ff8 0x18ff8 com.digidesign.iokit.DigiDal (24.10.2f4) CA535941-2721-3513-8056-4598F3D8A853 <17 7 6 3 1>
232 0 0xffffff7f97112000 0xffd 0xffd com.CalDigit.ThunderboltStationChargingSupport (1.2) 93581301-3B34-39B8-803B-E2F733B2D0D1 <17 7 6 3>

The odd thing is that the realtime bounce works perfectly, which one would presume would put more stress on the system!
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Mac Pro 2019 7,1 12-core 3.3Ghz, 96GB RAM, macOS Ventura 13.7.2
ProTools HDX Ultimate 2024.10.2
Avid HD16 i/o, Digidesign Blue 96i/o
UAD Octo PCIe, UAD Octo Thunderbolt 3 Satellite
SSL UF8, SSL UC1

www.adrian-hall.com
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  #4  
Old 01-19-2025, 06:20 PM
aidyhall aidyhall is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

OK, so the plot grows thicker. Offline bounces in HDX Classic mode worked perfectly, as did Core Audio. Then when I went back to HDX Hybrid mode, it is now working perfectly again. Probably as a result of resetting the Playback Engine each time. So, the fault is intermittent, which is always difficult to track down. I guess I'll just have to wait for it to go wrong again.

But at least I have a couple of possible work-arounds using different Playback Engines for printing mixes offline if it starts to happen again (which I'm fairly certain it will) ...
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Mac Pro 2019 7,1 12-core 3.3Ghz, 96GB RAM, macOS Ventura 13.7.2
ProTools HDX Ultimate 2024.10.2
Avid HD16 i/o, Digidesign Blue 96i/o
UAD Octo PCIe, UAD Octo Thunderbolt 3 Satellite
SSL UF8, SSL UC1

www.adrian-hall.com
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  #5  
Old 01-19-2025, 06:34 PM
Darryl Ramm Darryl Ramm is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

Quote:
Originally Posted by aidyhall View Post
Hi Darryl, thanks for all of this advice. I will slowly work my way through the various options. It's difficult when I have mixes to do and deadlines to meet!

In answer to your questions, yes, the offline bounce itself works, and I can re-import the bounced audio into the session. But then the first time that I hit play, the transport stops instantly, and I get the -9173 error. Sometimes it gives me a specific plugin, but that plugin changes every time I clear the error and hit play again.

I am running Hybrid Engine, but no plugins are DSP in the mix, literally no load showing on the DSP card in System Usage. I will try with Classic mode and Mac Audio when I get a chance.

And yes, it is happening on a number of different sessions. Interestingly, I've not had this problem before, and I don't remember having this problem with 2024.10.1, I'm pretty sure it started with 2024.10.2.

From the Terminal, the response when I type the kexstat prompt is :

Executing: /usr/bin/kmutil showloaded
No variant specified, falling back to release
191 0 0xffffff7f97114000 0x18ff8 0x18ff8 com.digidesign.iokit.DigiDal (24.10.2f4) CA535941-2721-3513-8056-4598F3D8A853 <17 7 6 3 1>
24.10.2f4 is the HD Driver kext in the 2024.10.2 update, which presumably is the right one to run.

Quote:
The odd thing is that the realtime bounce works perfectly, which one would presume would put more stress on the system!
I don't think a problem like this is necessarily "stress" or load related, I'd suspect much more there is a coding error/bug behind this and the software is doing different things in a real time vs. offline bounce.

It would be surprising and disappointing if the changes in 2024.10.2 broke anything in 2024.10.1 like this, but you can do a crude test of that pretty easily. Rename Pro Tools.app to Pro Tools.2024.10.2.app and install Pro Tools 2024.10.1 again and run the HD Driver installer on that install pkg as well and see if that new install of Pro Tools works. Easy to recover each way but ideally I'd run the uninstaller and reinstall whatever looks like the best way to go from that test.

Yes I know this is a production system. Make sure you have good backups of the system drive.
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  #6  
Old 01-19-2025, 06:51 PM
aidyhall aidyhall is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

Yeah, I installed 24.10.2 as soon as it came out, hoping that Avid had fixed the playlist comping bug that had crept in with 24.10.1, but they hadn't. So yes, that's a good idea of yours to roll back to 24.10.1, and hopefully it will take care of the -9173 errors.

Thanks for your time!
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Mac Pro 2019 7,1 12-core 3.3Ghz, 96GB RAM, macOS Ventura 13.7.2
ProTools HDX Ultimate 2024.10.2
Avid HD16 i/o, Digidesign Blue 96i/o
UAD Octo PCIe, UAD Octo Thunderbolt 3 Satellite
SSL UF8, SSL UC1

www.adrian-hall.com
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  #7  
Old 01-24-2025, 07:18 PM
aidyhall aidyhall is offline
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Default Re: Offline bounce causes -9173 error on next playback, have to reset Playback Engine

I have narrowed down this -9173 error to a very specific cause! The problem is actually do with importing offline bounced audio tracks back into the session!

If I bounce the audio and choose not to import the audio into my session, then I can resume playback and there is no error. But, if I choose to import the newly bounced audio back into my session, either from the Bounce dialog box or manually importing the audio afterwards using the Import Audio function, then the Playback Engine stops and won't let me play the track without a -9173 error. But if I make the newly imported audio track inactive, then I can play the session. If I wish to play the new audio, I have to reset the Playback Engine by flicking the buffer size to another setting and back, like I did previously.

So, it seems this is actually an error on importing audio, that causes the Playback Engine to throw an error. I am bouncing the audio at the same sample rate and bit depth as the session, and using Interleaved files, as I have done for years.

Anybody had any similar issues?
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Mac Pro 2019 7,1 12-core 3.3Ghz, 96GB RAM, macOS Ventura 13.7.2
ProTools HDX Ultimate 2024.10.2
Avid HD16 i/o, Digidesign Blue 96i/o
UAD Octo PCIe, UAD Octo Thunderbolt 3 Satellite
SSL UF8, SSL UC1

www.adrian-hall.com
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