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Forums DaVinci Resolve Audio clip plays faster in Edit track, but normal speed in preview and fairlight

  • Audio clip plays faster in Edit track, but normal speed in preview and fairlight

  • Karl Buhl

    January 26, 2022 at 2:26 am

    I imported a stereo audio music clip into DVR Studio 17. The audio clip plays normal speed outside of DVR as a .WAV file or .MP3 file. The clip plays normal speed in the edit preview window of DVR (upper-left corner of the edit tab). The audio clip plays normal speed in the fairlight tab.

    However, when I paste the audio clip into an edit track (this clip is on its own separate track, and the track is configured as stereo), and then I play it along with the existing video clips in the edit tab, this audio clip plays normal speed for about 1-second—and then it speeds up to maybe about 1.25x of normal speed.

    The video plays at normal speed. The graphical wave forms of the audio clip are not compressed / have not changed when the audio playback speeds up. I have deleted and re-added the stereo audio track in the edit tab. I have re-imported the clip both as a .WAV and .MP3. Unable to fix it.

    This sounds like a sampling issue. But I am mystified why the audio clip plays back at normal speed in some modules of DVR 17, but then plays back at a faster rate when the audio clip has been pasted into an edit track.

    Has anyone seen this behavior before? Any suggestions to fix?

    Thank you,

    Karl Buhl

  • Michael Gissing

    January 26, 2022 at 6:50 am

    My guess is a mismatch in sample rate which doesn’t affect preview but it can’t sample rate convert on the fly when the clip is in the timeline. Look at the clip details to see if the sample rate matches your sequence. Personally I would convert the clip to be wav and matching the sample rate of the project which should be 48khz

  • Karl Buhl

    January 28, 2022 at 1:42 am

    Hi Michael. Thanks for your suggestion.

    The audio clip was originally sampled at 44.1. I used Audacity to resample up to 48 (Audacity makes re-sampling very easy.) The problem continued with the up-sampled 48 kHz clip.

    I added a separate audio track for this new 48 kHz clip, used the audio waveforms to visually sync with the video, and ran a sample render. The audio rendered normal speed perfectly in sync with the audio. Very strange.

    Do you think the bit depth would impact this? I think the re-sampled clip was @ 32-bit variable instead of 24-bit.

    I’d like to eventually figure out the problem, but at this point I probably won’t spend the time to chase it.

    Thanks for your assistance.

    Cheers,

  • Michael Gissing

    January 28, 2022 at 3:15 am

    Audacity defaults to 32 bit float which is not what you want. Stick to 24 or 16 bit. If you want a much better batch SR converter then try this free one from Voxengo. https://www.voxengo.com/product/r8brain/

    Also check out their plugins. I use their EQ and dynamics plugins a lot.

  • Karl Buhl

    January 31, 2022 at 3:30 am

    Michael—I purchased the pro version of the Voxengo resampling software (I like to support boutique developers), converted the audio clip from 44.1 / 16-bit to 48 / 24-bit—and I still had the same problem. At that point it should have worked, so I concluded that the DaVinci file was corrupted.

    I deleted the file, started from scratch, imported the re-sampled audio clip, and everything was fine. Not sure how the DVR file got corrupted, but that was the problem.

    Thank you for the intro to Voxengo. Does his plugins work with fairlight, or only with DAWs? Does his plugins work with Studio One?

    Thanks again,

    Cheers,

    Karl

  • John Fishback

    January 31, 2022 at 4:59 am

    Fairlight uses Audio Units and VST audio plugins. Most audio plugins offer both AU and VST options when installing.

  • Michael Gissing

    February 3, 2022 at 3:27 am

    Voxengo make plugins in all the normal formats for DAWs. I use the VST3 versions in Fairlight running under Win10 OS and they work perfectly. They also come in AU format which should work on Mac OS. I’m pretty sure they work properly on both Win & Mac OS

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