Multicam editing with differing frame rates

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watkinsp

  • Posts: 12
  • Joined: Tue Apr 24, 2018 5:32 pm
  • Real Name: Peter Watkins

Multicam editing with differing frame rates

PostThu Jun 14, 2018 6:14 pm

I'm editing a multicam lecture recording with two angles which I had Resolve sync using the audio tracks. One clip has a frame rate of 30 FPS, the other, 29.97. By the end of the 1-hour lecture, they're off from each other by about a frame. My timeline frame rate is 30 FPS. By my calculations, if Resolve didn't adapt the two frame rates, they would be off from each other by about 3.6 seconds at the end of the hour.

So I'm guessing that my misalignment by the end of the hour is due to digital clock / audio clock differences in the source footage, not the differing frame rates. Am I correct in this assumption?

What's the recommended way to fix this? The timecode in the clips wasn't synced or jammed during capture and there's no LTC in any of the audio channels. I could go every 15 minutes and cut little slices from the longer clip. Is there a more automatic way?

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Dell OptiPlex 7040
Intel i7-6700 @ 3.40GHz
16 GB RAM
500 GB SATA SSD
AMD Radeon R7 350X with 4GB of DDR3 - Radeon SW 18.8.2
Microsoft Windows 10 Pro 10.0.16299 Build 16299
DaVinci Resolve 15.0.1.003
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watkinsp

  • Posts: 12
  • Joined: Tue Apr 24, 2018 5:32 pm
  • Real Name: Peter Watkins

Re: Multicam editing with differing frame rates

PostThu Jun 14, 2018 9:52 pm

OK. It looks like there was a hiccup in my capture at 01:1:10:00. Everything was roughly in sync up to the point where the playhead is in the picture below. Then the R and L audio channel for the bottom clip show two pauses. After these pauses, the two clips go out of sync.

I don't know what caused the pauses. The clips actually came from a software video switcher (Wirecast). The top one is an ISO recording (direct from an Intensity Pro ingest card) while the bottom one is the output of the switcher. So I guess I just need to delete the two pauses from my bottom clip and I'm good to go.

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Dell OptiPlex 7040
Intel i7-6700 @ 3.40GHz
16 GB RAM
500 GB SATA SSD
AMD Radeon R7 350X with 4GB of DDR3 - Radeon SW 18.8.2
Microsoft Windows 10 Pro 10.0.16299 Build 16299
DaVinci Resolve 15.0.1.003

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