Iphone video/audio out of sync

DaVinci Resolve 19 Public Beta Discussion
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peropenx

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Iphone video/audio out of sync

PostThu May 02, 2024 2:30 pm

Video recorded on iPhone 11 with Blackmagic cam app (MOV, AAC, HEVC, 4K, 25 fps) acts normal in 18.6.6 but when imported in 19 Public beta audio is out of sync with video, like video is in wrong FPS. Even if you make it in sync in the beginning of video audio will get out of sync in 10-15 seconds and continue to get even more during the clip.

Tried on Intel Mac and Silicon Mac, both free and Studio version - result is the same.

Everything works as normal when in 18.6.6. and when playing on iPhone or Mac/Quicktime
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Uli Plank

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Re: Iphone video/audio out of sync

PostFri May 03, 2024 11:57 am

Please check the amount of variation against intended fps with MediaInfo.
Now that the cat #19 is out of the bag, test it as much as you can and use the subforum.

Studio 18.6.6, MacOS 13.6.6, 2017 iMac, 32 GB, Radeon Pro 580
MacBook M1 Pro, 16 GPU cores, 32 GB RAM and iPhone 15 Pro
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Dwaine Maggart

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Re: Iphone video/audio out of sync

PostFri May 03, 2024 5:43 pm

Can you provide a link to a sample clip?
Dwaine Maggart
Blackmagic Design DaVinci Support
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darkprocess

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Re: Iphone video/audio out of sync

PostSun May 05, 2024 8:47 am

I have the same issue. Video has VFR framerate that DVR is unable to use correctly
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Uli Plank

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Re: Iphone video/audio out of sync

PostSun May 05, 2024 9:18 am

Within certain limits, it works. That’s why it would be helpful to look at a clip.
Now that the cat #19 is out of the bag, test it as much as you can and use the subforum.

Studio 18.6.6, MacOS 13.6.6, 2017 iMac, 32 GB, Radeon Pro 580
MacBook M1 Pro, 16 GPU cores, 32 GB RAM and iPhone 15 Pro
Speed Editor, UltraStudio Monitor 3G
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michaelh99

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Re: Iphone video/audio out of sync

PostSun May 05, 2024 4:19 pm

"Everything works as normal when in 18.6.6."

Using the same clip(s)?

Not all VFR clips are the same.
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darkprocess

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Re: Iphone video/audio out of sync

PostSun May 05, 2024 5:06 pm

Can’t test on 18.6. I’m on 19b2 and videos from balckmagic cam app are out of sync
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Uli Plank

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Re: Iphone video/audio out of sync

PostMon May 06, 2024 1:45 am

Well, I don't see (and hear) a problem here in 19 beta2 with recordings out of my iPhone 15, which have speed deviations of considerably less than 1%. Set to 60 fps, I see values between 59,940 and 60,181.
Which ones are yours? And then, did you use any stabilisation?
Now that the cat #19 is out of the bag, test it as much as you can and use the subforum.

Studio 18.6.6, MacOS 13.6.6, 2017 iMac, 32 GB, Radeon Pro 580
MacBook M1 Pro, 16 GPU cores, 32 GB RAM and iPhone 15 Pro
Speed Editor, UltraStudio Monitor 3G

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