Prepare the picture and sound
Two inputs, one video result
Have your picture source ready in Photos or Files, plus either an audio file in Files or a second video in Photos that supplies the sound. Selecting the first video does not also select the second source. The example below uses audio from another Photos video and produces a roughly six-second video.
Decide whether you need a timeline editor
This tool selects a sound source but has no controls for track balance, a delayed start, looping, or trimming the audio. If you need narration over music or a sound that begins several seconds into the video, prepare that soundtrack separately before importing it.
Check the beginning and the ending
Prepare source lengths for the section you need. Do not assume that a short soundtrack will loop or that longer audio will extend the picture. Play the exported video to check the selected sound, synchronization, volume, and the final seconds before saving.
01
Open Merge Audio and Video in Process
In ClipDock, open the Process tab and tap Merge Audio and Video. Start with the video whose picture you want to keep; choose the sound source afterward.
02
Choose the video to process
In Select Video, tap Choose from Photos or Choose from Files and select your video. You can import a video even when the download list is empty.
03
Choose the video source first
Import the video whose picture you want to retain. The card shows its preview, dimensions, and duration. Audio Source initially reads Not Selected.
Picture and audio sources are separate
Choose which file supplies the picture before selecting sound. A visible video preview does not mean the audio source has been set.
04
Choose the audio source
Tap Audio Source. The dialog offers Choose from Files and Extract audio from Photos video.
Choose from Files
Select a prepared audio file through the system file picker.
Extract audio from Photos video
This takes sound from a Photos video. The example selects another video here without first exporting an independent audio file.
05
Confirm the source and merge
Audio Source now shows the selected filename. Check it and tap Start Processing.
No additional mixing controls are shown
Audio Source selects the sound input. This page has no separate mixing levels, timing offset, looping, or audio-trim controls. Prepare your sources first if you need those adjustments, and listen to the export.
06
Check the result, then save or keep processing
Play the merged video before saving. Check the audio source, initial sync, volume, and ending, especially when the source files have different durations.
Preview and save
Play the result and check picture, duration, and sound, then tap Save to Photos. The first save may require permission to add photos and videos. After the success message, check the file in Photos.
What the other buttons do
Keep Processing takes the result into tool selection. Share File opens sharing options. Done closes the result page; it does not save to Photos.
Troubleshooting
Sound is out of sync or the ending is wrong
If the wrong sound plays, reopen Audio Source and check the selected filename. If the sound starts at the wrong moment or ends too soon, prepare the source media separately and merge again: this screen has no timing-offset, looping, or audio-trim controls. Check the export before saving it.
Frequently asked questions
Must I extract audio first?
No. Choose Extract audio from Photos video to use sound directly from another video.
Can I adjust the ratio of two audio tracks?
This page does not provide mixing-ratio or multi-track controls. Prepare the audio separately if you need to mix tracks.
Try it on your device
ClipDock is free to download, with in-app purchases. Features and available options depend on the current app version.
Download on the App Store