Replace Audio Track muxes your uploaded music or voiceover over the owned picture, drops the original soundtrack, and optionally offsets the new bed by ±ms before you cross-post.
What does replace audio write?
It keeps the video stream (copy when possible), maps your sidecar audio (MP3/M4A/WAV/AAC/OGG ≤10 MB) as AAC, and ends at the shorter of picture or bed with -shortest.
What does muxing licensed music or VO over picture change?
Replace audio produces licensed music or VO muxed over owned picture in one pass.
Concrete results of replace audio:
- Original soundtrack is dropped — no accidental rights bleed.
- Sidecar upload up to 10 MB (MP3/M4A/WAV) with optional ±ms offset.
- Picture stream stays; bed swaps without a desktop NLE.
What happens when temp beds ride into drafts?
Without replace, drafts carry shipping temp beds you meant to replace into a rights review.
What shipping replaceable audio early costs:
- Platforms hear the draft track.
- Editors re-mute and remux under publish pressure.
- Music clearance lands after the cut is already uploaded.
How do cleared beds unlock publish timelines?
A cleared bed on owned picture is picture-first posts that unlock approved audio before upload.
Why picture can move while music clears:
- Brand music clearance often lands after the picture is approved.
- Replace keeps the cut while swapping a cleared bed.
- Pairs with loudness normalize after the new track is locked.
- Without replace, risky audio rides into drafts by inertia.
Replace drops the original soundtrack; you must upload audio you are licensed to post.
When replace audio vs audio sync shift?
Use replace when the bed itself must change (licensed music/VO); use sync shift when the existing soundtrack only needs a millisecond timing nudge.
Related audio prep:
What does the new-track offset control?
Positive ms delays the replacement bed; negative advances it — for aligning music hits or VO to picture without a full NLE.
What replace audio does not do?
It does not duck under dialogue, stem-separate, or clear rights for you — you must upload audio you are licensed to post.
Replace audio swaps in licensed music or VO so the picture is ready for a clean cross-post.