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Audio Slowly Drifts Out Of Sync After 10 Minutes Of A Long Podcast Recording

Solvedaudio-syncframe-ratevideo-editing7 replies · 419 views · started
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Accepted solution by Nell Eriksen — drift that grows over time is almost always variable frame rate (VFR). phones, screen recorders and some capture tools record VFR. check…
  1. Chen A.
    @chena631

    so annoyed rn this drift is ruining my project.. 😤 a long podcast recording, 10 minutes in, and voices are clearly out of sync:

    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

    i used teh free Resolve version. is it the recording, the settings, or the software?

    i'd like to fix this at teh source, so future recordings don't have teh same problem. any advice on settings is apprecaited. any help to stop the endless manual nudging is welcome. thx in advance!!

    1
  2. Silas Okafor
    @nimbusbuilder

    hmmmm quick q whats your timeline frame rate compared to the source?

    1 0 helpful
  4. Nell Eriksen
    @nell_buffer

    Convert VFR to constant frame rate (CFR) before editing: ffmpeg -i input.mp4 -vf fps=30 -c:v libx264 -crf 18 -c:a aac -b:a 192k output.mp4 (use the frame rate of your project). Or transcode to an intermediate like DNxHR at a fixed rate.

    37 0 helpful
  5. Emeka
    @emeka.iqbal

    oh ive been there lol make sure the timeline frame rate matches teh source. A 29.97 source on a 30 fps timeline or 25 vs 24 will cause slow drift.

    4 0 helpful
  6. Nell Eriksen
    @nell_buffer

    hmmmm quick q is resolve even worth bothering with or should i just leave it ?

    2 0 helpful
  7. Nell Eriksen
    @nell_buffer
    Accepted solution

    drift that grows over time is almost always variable frame rate (VFR). phones, screen recorders and some capture tools record VFR. check the file with a media info tool: 'Frame rate mode: Variable' confirms it. fingers crossed 🤞

    1 2 helpful
  8. Chen A.
    @chena631
    in reply to @nell_buffer

    @nell_buffer wowww ok changed OBS to constant frame rate and 48 kHz. new recordings stay in sync from start to finish. u guys are the best!!!

    2 9 helpful

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