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audio slowly drifts out of sync after 30 minutes of phone footage 😭

Solvedaudio-syncframe-ratevideo-editing8 replies · 224 views · started
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Accepted solution by Nico — hmmm in screen recording software like OBS, set a constant frame rate and match the audio sample rate (48 kHz) to the project.. lol…
  1. Daria Weber
    @daria_proxy

    im literally losing my mind here i recorded phone footage and dropped it into the free Resolve version... eevrythings perfectly in sync at the start, but after 30 minutes the audio is noticeably bheind:

    Timeline 1 | 30 fps | 48 kHz

    Timeline 1   |   30 fps   |   48 kHz
A1  camera
A2  recorder   +8 fr   +16 fr
Clap marks line up at the start, then slowly drift apart

    Cutting and nudging every few minutes is driving me crazy 😤 Is there a real fix for this?

    i've tried re-importing the clip and restarting the editor, the drift is identical every time, slowly growing as the clip goes on... i can post media info details if that helps.

    7
  2. Erik Grant
    @quietworks

    wait is the audio from the same device, or recorded separately??

    0 1 helpful
  4. Cleo Castillo
    @ccastillo-3rg

    hmmm drift that grows over time is almost always variable frame rate (VFR). Phones, screen recorders and some capture tools record VFR. Check teh file with a media info tool: Frame rate mode: Variable confirms it. lmk how it goes

    0 1 helpful
  5. Wes T.
    @wes_loose

    @wes_loose nah thats not it, minuets has nothing to do with it

    1 0 helpful
  6. Malik
    @mkim_0

    yeahhh for long recordings, check teh audio sample rate in teh clip attributes. A 44.1 kHz file interpreted as 48 kHz will drift steadily. fingers crossed 🤞

    thumbsup

    5 0 helpful
  7. Nico
    @nfischer
    Accepted solution

    hmmm in screen recording software like OBS, set a constant frame rate and match the audio sample rate (48 kHz) to the project.. lol mismatched sample rates can also cause drift.

    2 9 helpful
  8. Wes T.
    @wes_loose
    in reply to @nfischer

    re-encoding with FFmpeg to H.264 works, but for heavy editing Id transcode to an intermediate codec instead to avoid generation loss. idk maybe im wrong lol

    39 0 helpful
  9. Daria Weber
    @daria_proxy
    in reply to @nfischer

    @nfischer omggg matching teh timeline to 29.97 fixed it... cant believe it was that small a difference. thank u thank u thank u

    party

    0 0 helpful

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