Question 1

What does Volcengine Video Lip Sync do?

Accepted Answer

It takes an existing video and a target audio track, then regenerates the speaker's mouth movements so they match the new audio — useful for dubbing or re-voicing footage without reshooting.

Question 2

What's the difference between lite and basic mode?

Accepted Answer

`lite` mode is optimized for single-person, frontal-facing videos and processes faster. `basic` mode supports more complex scenes, including scene segmentation and speaker identification via `open_scenedet`.

Question 3

What video and audio formats are supported?

Accepted Answer

Video: MOV, MP4, or HDR, 360p–1080p resolution (above 1080p is compressed down), up to 500MB, 24–60fps, 1–30 Mbps bitrate. Audio: MP3, WAV, AAC, MP4-audio, or OGG, up to 10MB.

Question 4

What happens if the audio is longer or shorter than the video?

Accepted Answer

The output duration always follows the audio. If the video is shorter than the audio, it's looped (`align_audio`) — optionally in reverse (`align_audio_reverse`) — to fill the gap. If the video is longer, it's trimmed to the audio length.

Question 5

What does separate_vocal do?

Accepted Answer

When enabled, it runs vocal separation on the input audio to suppress background music or noise before using it to drive lip movement, improving sync accuracy on noisy tracks.

Question 6

What resolution and frame rate is the output video?

Accepted Answer

The generated video is returned as MP4 at 25fps, matching the input video's resolution up to 1080p.