SyncTime for Mac is a professional tool designed specifically for video post-production, podcast production, and multimedia content creators. Its core function is to efficiently and accurately synchronize video footage shot from multiple camera angles with independently recorded audio files (such as audio from external recorders or lavalier microphones). By analyzing audio waveforms, it automatically aligns audio tracks, solving the audio-video delay issues caused by device desynchronization during shooting, greatly improving the workflow efficiency of post-production.

I. Detailed Explanation of the Core Interface and Workspace

SyncTime’s interface design is clean and intuitive, mainly divided into four core areas:

Media Library Panel (Left Side): Used for importing and managing all video and audio assets. You can create asset bins here and view detailed information about files (such as duration and sample rate).
Preview Window (Top Center): Plays the selected video or audio file, providing basic playback controls (play, pause, skip).
Waveform Analysis Panel (Bottom Center): This is the core workspace of the software. Imported audio files will be displayed here as visualized waveforms. You can zoom in and out (Command + +/-) to view waveform details, providing a reference for manual alignment.
Synchronization Queue and Output Settings Panel (Right Side):
- Synchronization Queue: Displays the clip groups awaiting synchronization in a list format. Each clip group contains one “reference” file and one or more “sync” files.
- Output Settings: Configure parameters for the generated files after synchronization, such as format, codec, resolution, and save path.

II. Complete Workflow: From Creation to Export

Step 1: Create a New Project and Import Media

Method: After launching SyncTime, the software will automatically create an untitled project. You can start importing media right away.

Click the “+” button in the upper-left corner of the Media Library panel, or use the shortcut Command + I, to select the video and audio files you need to sync from Finder.
You can also drag and drop files directly from Finder into the Media Library panel.

Tip: It is recommended to place media from the same scene that need to be synced together. Video files usually contain a built-in audio track, while WAV/AIFF files recorded with a separate recorder will serve as high-quality reference audio tracks.

Step 2: Create a Sync Clip Group

Method: In the Media Library, select the files you want to sync.

First, select the file with the best audio quality (usually an external recorder file) as the “Reference” file. Right-click on it and select “Set as Reference Clip”.
Then, hold down the Command key and click to select one or more video files that need to be synced with the reference file.
Right-click the selected file and choose “Synchronize with Reference Clip.” A synchronized clip group will then be created in the sync queue on the right.

Step 3: Run Sync Analysis

Method: In the sync queue on the right, you will see the clip group you just created.

The software will usually begin analyzing the waveforms and aligning them automatically. If it does not start, click the “Sync” button next to the clip group.
Once analysis is complete, the status bar will show “Synced.” In the waveform panel, you can see that the reference audio track (blue) and the video’s built-in audio track (orange) are precisely aligned.
Click the play button in the preview window to check whether the sync result is accurate.

Step 4: Fine-Tune and Check (If Needed)

Method: If the automatic sync is slightly off, you can adjust it manually.

In the sync queue, click the video file that needs adjustment.
In the waveform panel, move the mouse pointer over the orange waveform (the video audio track), and the cursor will change to a left-right arrow.
Hold down the left mouse button and drag the orange waveform left or right so that it aligns exactly with the blue reference waveform at key points (such as claps or the start of dialogue). You can also use the arrow keys for frame-by-frame fine-tuning.

Step 5: Configure Output Settings and Export

Method: Once synchronization is confirmed, prepare to export the final product.

At the top of the right panel, switch to the “Output Settings” tab.
Set the output format (e.g., QuickTime Movie), video codec (e.g., ProRes 422), and audio (typically choose 16-bit or 24-bit linear PCM).
In the “Output To” option, select the save folder.
Finally, click the large “Export All” button below the sync queue, or use the shortcut Command + E, to begin rendering and exporting.
Once the export is complete, the status will update, and you can find the new video file with synchronized audio in the specified folder.

III. Advanced Tips for Common Features

Batch Synchronization: You can create multiple sync edit groups. For example, to sync multiple camera angles to a single reference audio, simply establish synchronization relationships between multiple video files and one reference file simultaneously.
Replace Reference Audio Track: The exported video will use the high-quality reference audio track to replace its original low-quality built-in audio track, achieving audio quality upgrade.
Waveform Zoom and Navigation: In the waveform panel, use Command + Mouse Scroll Wheel to quickly zoom the waveform horizontally. Use Spacebar + Drag to pan and view the waveform.
Project Saving: Use Command + S to save the project file (.synctime) so you can modify or re-export it later.

IV. Common Issues and Solutions

Symptom	Possible Cause	Solution
Sync failure or inaccurate alignment	1. The ambient sound in the source clips is completely different (e.g., one is very quiet while the other is noisy). 2. The audio is severely clipped or distorted.	1. Try recording a clear “clapperboard” sound or sync point during shooting so the software can identify it more easily. 2. Find a recognizable common peak in the waveform panel (such as a cough) and manually drag to align.
Exported file size is too large	Lossless or high-bitrate encoding (such as ProRes 4444) is selected in the output settings.	Based on your subsequent editing needs, choose an encoding in the output settings that balances quality and file size, such as ProRes 422 LT or H.264.
The software cannot import certain file formats	The file format or codec is too unusual and is not supported.	Use QuickTime Player or third-party transcoding software (such as HandBrake) to first convert the source material to a common intermediate format (such as ProRes, H.264), then import it into SyncTime.
Playback preview stutters	The original source resolution is too high (such as 4K/8K), or the computer’s performance is insufficient.	Lower the playback resolution in the lower-right corner of the preview window (for example, set it to 1/2 or 1/4) to ensure a smooth preview experience.

V. Keyboard Shortcuts Summary

Function	Mac Shortcut	Description
Import Files	`Command + I`	Open the Import Files dialog
Save Project	`Command + S`	Save the current project
Export All	`Command + E`	Start exporting all clips in the sync queue
Play/Pause	`Spacebar`	Control playback in the preview window
Zoom In Waveform	`Command + =` or `Command + Scroll Up`	Horizontally zoom in the waveform view
Zoom Out Waveform	`Command + -` or `Command + Scroll Down`	Horizontally zoom out the waveform view
Manual Nudge (Left)	`Left Arrow Key`	Move the selected clip left by one frame
Manual Nudge (Right)	`Right Arrow Key`	Move the selected clip right by one frame
Select All	`Command + A`	Select all items in the media library or queue