How to subtitle a video that switches language mid-conversation
Upload the footage and give Vizard Agent the rule: which language gets subtitled into which. Vizard Agent transcribes everything, finds where each language starts and stops, reads the structure of the bilingual passages, and subtitles each stretch in the language its own speaker was not using.
What do you type into Vizard Agent?
State the rule as a pair. Vizard Agent applies it per passage rather than per file, so "English subtitles on the Arabic speech and Arabic subtitles on the English speech" is a complete instruction. You don't need to mark the switches or give timestamps, because Vizard Agent locates the boundaries itself.
Prompt
What does Vizard Agent actually do?
The subtitle language has to change whenever the spoken language does, so the rule is applied per passage rather than as one setting. A transcript of mixed speech isn't automatically labelled by language, so finding where the switches fall is a deliberate search, not something that falls out of the transcription. In the session behind this article it:
- Checked the project history and files, downloaded the source video, retrying when the first attempt failed, and inspected the downloaded file.
- Transcribed and surveyed the footage, looked at frames across the video and read the visual shot log.
- Checked and saved the transcript's structure, then searched it specifically for the Arabic passages before reading it through to the end.
- Loaded the clip-repurposing playbook and checked the caption, effect and auto-reframe options.
- Examined the candidate moments and the bilingual conversation specifically, read its breakdown, then checked the framing of each candidate.
When does this not work well?
Mixed-language speech is considerably harder to transcribe accurately than either language alone. Mid-sentence switching is hardest, because a rule per passage struggles with a rule per word. Right-to-left scripts need typefaces that are actually installed, and translation is interpretation: idioms rarely survive a subtitle intact.
Common questions
Do I have to mark where the language changes? No. Vizard Agent searches the transcript for each language and locates the boundaries.
Will right-to-left text display correctly? Yes, provided a supporting typeface exists. Vizard Agent checks before rendering.
What if someone switches mid-sentence? That is the hard case. Vizard Agent handles passages cleanly and will flag the messy ones.