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An extension is only the beginning
A container holds separate streams. Two files with the same extension can carry different audio codecs, several language tracks or damaged timestamps. The local inspection result is more useful than a claim that every file with a familiar extension will work. SubLunio shows available audio choices before extracting the selected track.
Large files are read in chunks
A movie over 2 GB does not need to fit into browser memory. The web workflow reads portions of the source file and keeps prepared audio in local storage. Duration limits and free disk space still matter. The desktop queue provides another workflow for folders and repeated processing, using the same account credit.
A playable subtitle does not require browser video playback
Some containers or video codecs cannot play smoothly in your browser even when the audio can be extracted. In that case, the preview displays subtitle text with timestamps instead of a video player. The exported SRT, VTT and ASS files can then accompany your original video in a compatible player.
Review the result before continuing
Start with a preview, listen to the selected speech and confirm the target language. Choose from 110+ subtitle languages, independently of the source recognition menu. For files with multiple soundtracks, verify that you selected the dialogue rather than commentary. Encrypted media is not decrypted, and damaged files may require repair before processing.
Subtitle file formats and video output capabilities
SRT, VTT and ASS are separate subtitle file formats; MP4 and MKV are video container formats. Exporting a subtitle file does not mean it preserves every preview style. For example, SRT does not guarantee preservation of colors and opacity.
Desktop checks playback, burned-in export and subtitle-track embedding separately. A file that supports subtitle generation may not support embedded tracks. Only available export methods are offered.