Video Dubbing Quick Start

What to prepare before you begin

• A folder that contains both videos and subtitles, preferably with the same batch grouped together
• Keep video and subtitle filenames aligned as much as possible, for example episode01.mp4 with episode01.srt
• Common video formats: .mp4, .mkv, .avi, .mov, .webm
• Common subtitle formats: .srt, .ass, .vtt

Step 1: Choose the media folder and check matching results

Open the “Video Dubbing” page in NativeVid, click “Choose Folder”, and select the directory that contains your videos and subtitles.

1. The system automatically scans video and subtitle files
2. It matches them by filename automatically, and matched items appear right away
3. For videos without a matched subtitle, you can manually assign the correct subtitle in the list
4. If duplicate files are detected, the system moves the duplicates into the _duplicates folder

After task creation, the default output directory is automatically set to the dubbed subfolder of the current folder, so no extra setup is needed.

Step 2: Set translation and audio-track options

Before submitting the task, decide whether this run needs translation and whether you want to keep background music.

1. Choose source and target languages

If the subtitles are still in the source language, choose the correct source and target languages; translation, voice loading, and output naming will all use this language pair.

2. Whether to skip translation

If the uploaded subtitles are already in the target language, for example you already have English subtitles and only want English dubbing, enable “Skip Translation” so the system uses the uploaded subtitles directly as dubbing text.

3. Whether to enable terminology review

When the video contains names, brands, or technical terms, enable terminology review. This lets you confirm high-frequency terms before translation actually begins, reducing line-by-line rework later.

4. Whether to enable background music separation

If you want to keep parts of the original accompaniment, drums, or ambient bed beneath the new dub, enable “Background Music Separation”. After enabling it, select at least one track to preserve, such as drums, bass, other accompaniment, guitar, or piano.

Step 3: Create roles and assign subtitles

Once the task enters “Role Assignment”, do not rush into voice selection. First clarify the speaker structure.

1. Create roles in the left-side role library, such as “Narrator”, “Host”, or “Guest A”
2. Assign a color to each role so it is easy to spot in the subtitle list
3. Click subtitle lines to assign roles. Single-line selection and drag-based continuous labeling are both supported
4. Frequently used roles can be switched quickly with shortcuts
5. For clearly unassigned lines that belong to the same speaker, use “Assign All Unlabeled” for bulk processing

Step 4: Choose a voice for each role and start dubbing

On the “Role Voices” page, the system only shows roles that already have subtitle lines assigned.

1. Click a role on the left to view the available voices for that role in the target language
2. Use the search box plus gender and age filters to narrow the list
3. Preview suitable voices and confirm whether the tone fits the content
4. Save the configuration after selecting voices for all roles
5. Click “Start Dubbing”, and the system generates speech in batch by subtitle line

Step 5: Fix problematic lines on the dubbing review page

Once you enter “Dubbing Review”, you can see both file-level progress and line-level status.

1. Check dubbing progress, completed count, and failure state for each video file
2. Use single-line preview to check whether a line sounds natural
3. If a line is too long, too short, or sounds unnatural, edit the translated text directly
4. Click “Regenerate” to redo only that line instead of rerunning the whole section
5. If there are failures, use “Batch Retry Failed Items” to continue generating

Step 6: Compose the video and review the final output

When all files finish dubbing, you can start “Compose Video”.

1. Click “Compose Video” on the review page
2. Wait for the system to perform audio-video alignment based on subtitle timing, dub duration, and preserved tracks
3. Open “Video Preview” to inspect the composed files
4. Use the preview page to toggle subtitles, adjust playback speed, and drag subtitle position for checks
5. Once everything looks right, open the output folder and collect the final video and subtitle files

The default output is usually located in the dubbed folder under the original media directory, with common filenames such as original-video.target-language.mp4 and original-subtitle.target-language.srt.