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#1
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Delay compensation bug after Pro Tools update.
All,
I updated one of our Pro Tools systems here from 10.13.6 and PT 2020.12 to 10.14.6 and PT 2021.12 (The last officially supported PT for that OS). We cannot go up to 10.15+ because there is a bug that changes the color space on Pro Res videos bounced out of Pro Tools(up to current). This is a big part of our workflow here. I have noticed an odd playback bug. After bouncing a 5.1 program, I attempted to phase cancel against the mix session. The mix phase cancelled completely against the source EXCEPT the dialogue stem. In this case, the dialogue stem is the stem showing the greatest delay compensation (1500-ish samples). When zooming in, the 5.1 printed in sync with the dialogue in the stem, down to the zero-crossing points. This was with the Hybrid engine on. With the hybrid engine off, the music and effects still cancel out, but there is now an audible slap between the dialogue from the mix session and the printed 5.1 What is going on and does anyone have any tips to solve this? This does not happen in 2020.12. The printed 5.1 phase cancels 100% against the mix session. Thanks, Randall
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Randall Smith Audio Editor/Mixer Starz Entertainment Group Denver, CO |
#2
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Re: Delay compensation bug after Pro Tools update.
Sounds like you have exceeded the delay comp on your DX stem. Are any tracks showing red in the delay comp values?
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[email protected] Newcomer Audio Post MacBookPro 2.3GHz i7 16GB RAM OSX 10.15.7, PT Ultimate 2023.12 HDn, MTRX Studio, 2x Avid S1, PT Dock... Mac M1 Studio Ultra 64GB RAM OSX 13.6, PT Ultimate 2023.12 HDn, MTRX Studio, 2x Avid S1, PT Dock... |
#3
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Re: Delay compensation bug after Pro Tools update.
Erik,
Thank you for responding. There are no tracks with red delay compensation values. This session is really basic. It is 3 5.1 stems (DME), which all feed individual sub busses. Only one of the sub busses is showing any delay compensation (DX at 1536(green)). Randall
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Randall Smith Audio Editor/Mixer Starz Entertainment Group Denver, CO |
#4
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Re: Delay compensation bug after Pro Tools update.
I noticed a similar experiencing yesterday on a 5.1 session. I’m going to conduct more testing with a previous version of PT. No obvious delay comp exceeded and it was only happening on the PM and none of the stems.
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#5
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Re: Delay compensation bug after Pro Tools update.
Which version of PT are you running?
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Randall Smith Audio Editor/Mixer Starz Entertainment Group Denver, CO |
#6
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Re: Delay compensation bug after Pro Tools update.
2022.12. I misread or original post of 2021.12 as 2022.12 so my issue may or may not be similar.
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#7
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Re: Delay compensation bug after Pro Tools update.
It sounds like the same issue. Also, it kind of confirms that my upgrading to 2022.12 would most likely not solve my issue.
Randall
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Randall Smith Audio Editor/Mixer Starz Entertainment Group Denver, CO |
#8
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Re: Delay compensation bug after Pro Tools update.
I don't think the issues are related. Mine was a delay compensation overload that I wasn't seeing when arming all 20 tracks for printing stems. When I did an offline bounce everything synced up fine.
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#9
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Re: Delay compensation bug after Pro Tools update.
This has been my experience ever since the introduction of the Hybrid engine.
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Pro Tools Ultimate 2024.3. OSX 13.6.5. Win 10. HD Native. Lynx AES16e. Lynx Aurora 16. i9-13900KF. ASRock Z690 Steel Legend. 64GB Ram. AMD Vega 64. BM Decklink. Dolby Atmos Renderer 5.2. Trinnov D-Mon. D-Command. |
#10
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Re: Delay compensation bug after Pro Tools update.
Quote:
These problems may have been introduced when Avid added "Allow Sends to persist during LLM" but IIRC that was in 2018.7 so the same bug might have been in 2020.12, but maybe you had different preference settings and were not seeing the bug. I have also not gone looking back at behaviors in past Pro Tools releases. The problem other folks have seen are manifest in one case where you have a H/W insert following a plugin, have "Allow Sends to persist during LLM" enabled and have LLM on. Disabling LLM or "Allow Sends to persist during LLM" in that case avoids the problem. This is Pro Tools bug PT-293686 been reported to Avid for months now, with trivial way to reproduce. There are other ways a similar delay comp error can occur. I'm a complete idiot when it comes to hybrid engine, have never used it, etc. (please send me some HDX cards and a MTRX and I'll explore this bug for ya all ). But for the heck of it you could try disabling "Allow Sends to persist during LLM" and LLM if they are even options (makes sense they could/should be but I am not sure) and see if this changes the behavior. Of course there may be other issues, plugins with broken delay comp, yet some other Pro Tools delay comp issue, some weird issue with routing, etc. but it would be great just to see if what you are seeing might be related to these other known problems. Last edited by Darryl Ramm; 01-12-2023 at 02:35 PM. |
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