Audio glitching in MP4 files imported to all Magix 64-bit apps

jeff-rippe wrote on 11/20/2022, 3:53 PM

When I import MP4 files into Vegas Pro 20 the audio is glitchy/garbled in spots. These same MP4 files play perfectly fine when opened or imported elsewhere (Media Player, DaVinci Resolve, Pro Tools, etc.) - so it's not a sound card issue.

I went back and tested my old copy of Movie Studio (v9) - which is 32-bit - and the same MP4 file loads and plays PERFECTLY.

I then tested other versions of Vegas Pro (v12) and Movie Studio (v10 and v13) and found that this problem seems to occur in all 64-bit versions of Vegas Pro and Movie Studio. The audio on the RIGHT channel of MP4 imports experience glitching, both during live playback and renders. Audio on the LEFT channel is fine. Project audio sample rates and bit depth settings have no effect on the glitching.

I converted the MP4 file to a .mov file (with a PCM audio stream) using ffmpeg and that file opened and played PERFECTLY in Vegas 20 and 14.

So, it seems there may be a problem with the Magix 64-bit MP4 audio decoder (qt7plug.dll ?). Again, these same MP4 files play perfectly everywhere else, but not when imported to any 64-bit version of Vegas (on my system).

Anyone else come across this problem? Solution?

(Windows 10 Home version)

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Comments

jeff-rippe wrote on 11/22/2022, 11:31 AM

File a trouble ticket with Magix.

OK, how? The instructions to submit a ticket on the website don't work/aren't current.

vkmast wrote on 11/22/2022, 11:43 AM

https://www.vegascreativesoftware.info/us/forum/support-system-upgrade--137601/

or https://www.vegascreativesoftware.info/us/support/ (click "VEGAS PRO" there and on the opening page go to the bottom to "Contact Support". and proceed)

john_dennis wrote on 11/22/2022, 12:41 PM

"If it's not a "known bug" then what do you call it? Apparently you were aware of this and others here have now confirmed it - so it's a 'known bug'!"

Don't misconstrue my ability to analyze your issue over many different O/S and application versions as prior knowledge. Until today, I've been blissfully unaware of this flavor of decoder problem. I just happen to have system images going back a long way and it's easy enough for me to load them and test issues that are presented on the forum. Need to test an application on Windows XP with a Q9450? I can do it.

jeff-rippe wrote on 11/22/2022, 1:17 PM

"If it's not a "known bug" then what do you call it? Apparently you were aware of this and others here have now confirmed it - so it's a 'known bug'!"

Don't misconstrue my ability to analyze your issue over many different O/S and application versions as prior knowledge. Until today, I've been blissfully unaware of this flavor of decoder problem. I just happen to have system images going back a long way and it's easy enough for me to load them and test issues that are presented on the forum. Need to test an application on Windows XP with a Q9450? I can do it.

I have older versions too going back to 32-bit days and XP. I traced this back and it seems to have started when 64-bit versions of Vegas and Movie Studio came out. I don't use Vegas every day like some folks so I am surprised no one else reported this long ago. When I do use Vegas I have I worked around it - but that shouldn't be necessary.

I submitted a ticket now and hopefully they will take a look. Thanks, everyone, for your inputs.