jamakgo — ai video subtitle studio
AI transcribes the Japanese audio into subtitles, then translates them into English or any language you want. A free Windows subtitle studio — extract embedded subtitles from MKV/MP4, edit on the timeline, and burn subtitles in.
Probes MKV/MP4 streams and extracts embedded SRT / ASS / SSA / VTT subtitles, or saves them in their original format. image subtitles not supported
Ten Japanese-specialized models — Whisper, Parakeet, SenseVoice, Qwen3-ASR and more. Silero VAD segments speech, and GPU acceleration transcribes a 24-minute video in tens of seconds.
Translate with DeepL or local NLLB. Japanese→Korean is the default and can be switched to any language such as English. Timestamps and speaker info are preserved, and API keys are stored only in a local file.
Timeline editing synced with the video preview — split, merge, retime, search & batch replace — plus SRT / ASS / VTT export and subtitle burn-in.
Run the same video across engines and compare CER/WER, reading CER, RTF, VRAM. A diff view shows per-sentence, character-level differences between models.
Open a video file or import a subtitle file directly. Embedded subtitle tracks are listed in a table.
For videos without subtitles, pick an engine to transcribe the Japanese audio. Timestamp alignment refines segment boundaries.
Japanese→Korean is the default and can be changed to any language. Edit source and translated text side by side per cue.
After review, export to SRT/ASS/VTT or burn subtitles into the video.
latest v0.13.2 · single exe 13.2MB
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