Watch a Downloaded Video with Live Translated Subtitles on Mac (VLC, IINA, QuickTime)
You have an MP4 or MKV in a language you don't speak and no subtitle file. Here is what VLC 3.0.23, IINA, and QuickTime Player can and cannot do, what Apple's built-in Live Captions covers, and how to read original and translated captions while any Mac player plays the file — with the honest limits.
2026-09-18 · 8 minThe short answer
There are three realistic routes for a video file with no subtitles in your language. First, look for a subtitle file: for released films and series one usually exists, and VLC and IINA can load it or search online subtitle databases for you; a human-made subtitle track beats any live recognition. Second, if the video's spoken language is one of the eight that Apple's built-in Live Captions supports and reading it in that same language is enough, turn on Live Captions and it will transcribe whatever the player outputs. Third, if you need a translation, or the language is not on Apple's list, run Alison Workspace: it listens to whatever your Mac plays and shows each recognized sentence with its translation in a floating window over VLC, IINA, QuickTime Player, or a browser. What does not exist yet is a Mac player that translates the audio track itself. The VLC build offered on videolan.org for macOS is still 3.0.23, and the on-device AI subtitle feature VideoLAN demonstrated for VLC 4 in January 2025 had not shipped as of September 17, 2026.
What VLC, IINA, and QuickTime Player actually do with subtitles
All three play subtitle tracks; none of them create one from speech. VLC opens an .srt or .ass file placed next to the video with the same file name, lets you add one from the Subtitle menu, offers a subtitle delay setting when the timing drifts, and can search online subtitle providers through its extensions. Its announced automatic subtitles and live translation belong to the unreleased VLC 4 line; the stable download at the time of writing is 3.0.23, which runs on macOS 10.7.5 or later on Intel and Apple-silicon Macs. IINA, a free open-source player for macOS, lists Online Subtitles among its features and requires macOS 12 on Apple-silicon Macs. QuickTime Player is the strictest: Apple's guide says that if a movie has subtitles or captions, QuickTime Player can display them via View > Subtitles, and closed captioning only appears when captions are embedded in the CEA-608 format. In every case the translation problem remains yours.
Route one: find a subtitle file before anything else
A subtitle track written by a person, in your language, is the best experience you can get: exact timing, proper names spelled correctly, idioms rendered sensibly. For commercially released content, check whether the file already carries embedded tracks (VLC: Subtitle > Sub Track; IINA: the subtitle menu; QuickTime: View > Subtitles), then try the online subtitle search built into VLC or IINA. Name the downloaded .srt exactly like the video file so the player picks it up automatically, and use the player's subtitle delay controls if the timing drifts. This route fails for the material people most often ask about: a lecture recording, a family video, a conference talk, a downloaded livestream, a client's screen recording, or an obscure upload. When no track exists and nobody is going to write one, you are left with live recognition — routes two and three.
Route two: Apple's built-in Live Captions for playback
Every Apple-silicon Mac includes Live Captions under System Settings, Accessibility, Live Captions. By default it transcribes audio from all apps, so whatever VLC, IINA, or QuickTime Player is outputting becomes text, and Apple says the audio is processed on device. On Apple's macOS feature-availability page for the current release, macOS 27 (checked September 17, 2026), the supported languages are Cantonese, English (Australia, Canada, India, Singapore, UK, US), French (Canada, France), German, Japanese, Korean, Mandarin Chinese (China mainland, Taiwan), and Spanish (Mexico, Spain, US). It does not translate: a Japanese film yields Japanese text. Apple also notes that accuracy may vary and that Live Captions should not be relied upon in high-risk or emergency situations. If the film is in one of those languages and you can read it, this is free and needs only the one-time language download.
Route three: original plus translation over any player with Alison Workspace
Alison Workspace does not open the video file. It reads the audio your Mac is playing, so it works identically with VLC, IINA, QuickTime Player, or a browser tab, with no plugin per player. Open the video, start Alison, allow the Screen & System Audio Recording permission that macOS requests, choose the language spoken in the video and the language you want to read, and press play. A floating window shows the recognized sentence on one line and its translation beneath it; you can drag and resize it, set it to click-through so it never steals a click from the player, and adjust font, size, colors, and background. Recognition covers 100 spoken languages; translation offers up to 21 target languages depending on the Apple language resources available on your Mac. After the one-time download of those resources, capture, recognition, and translation run on the Mac and nothing is uploaded. It requires macOS 15 or later on an Apple-silicon Mac, and new users get 120 minutes of listening free before deciding.
Getting better results from a file
Live recognition is only as good as the dialogue it hears. Clear speech with little background music transcribes well; action scenes, songs, whispering, dialects, and several people talking at once do not. Choose the exact spoken language instead of automatic detection when you know it, and add recurring names, places, or technical terms to Alison's custom dictionary and hot words so they come out spelled the way you expect. Because the captions follow the audio as it plays, you can pause the player to catch up and rewind a few seconds to hear a line again; the captions simply run again with it. Normal playback speed gives the most readable translation. The captions come from the digital playback signal, so speakers, wired headphones, and Bluetooth headphones all work; test your usual setup once with a one-minute clip before starting a two-hour film. Captions stop while the display is asleep.
What this is not: no synced subtitle file, and some content stays off limits
Alison is a reading aid, not a subtitle generator. It does not produce an .srt that lines up with the video's own timeline. The session history can be exported as text or as an SRT file, but the timestamps in that export count from the moment you pressed Start, not from the video's timecode, so they only match if you start both together and never pause. If you need a properly timed, editable subtitle track to keep or share, use a file-based transcription tool for that job. Films bought from online stores may be protected so that their audio is not exposed to capture, and their terms may prohibit it; test with a permitted file rather than assuming. Finally, a live translation of spoken dialogue is not a professional subtitle translation: idioms, jokes, and wordplay lose nuance, and important facts should be checked against the original line, which is why Alison keeps it visible.
Which route to choose
If a subtitle file in your language exists, load it and stop reading. If the video's language is one of Apple's eight Live Captions languages and reading the original is enough, use Live Captions: it is free and already installed. If you need a translation, if the language is not on that list — Portuguese, Italian, Arabic, Hindi, Indonesian, Vietnamese, Turkish, and Thai are all absent, for example — or if you want one caption window that follows you from VLC to IINA to a browser, Alison Workspace is the tool for the job, within the limits above. If what you really need is a subtitle file to keep, translate, or share, that is a transcription task rather than a live-caption task. Whatever you choose, run a one-minute test with your own file and your own language pair first; the cost of finding out during the opening scene is much lower than finding out an hour in.
Official VideoLAN, IINA, and Apple sources checked September 17, 2026
VideoLAN — VLC media player for macOS (current version and requirements)
IINA — official site (feature list and macOS requirements)
Apple Support — Show subtitles or captions in QuickTime Player on Mac
Apple — macOS Feature Availability (Live Captions languages and regions)
Apple Support — Get captions of spoken and computer audio on Mac
Frequently asked questions
Can VLC generate subtitles automatically on a Mac?
Not in the current release. The macOS build offered on videolan.org is VLC 3.0.23, which plays subtitle files and can search online subtitle providers but does not transcribe or translate speech. VideoLAN demonstrated on-device AI subtitles for VLC 4 in January 2025; as of September 17, 2026 that version had not been released as a stable build.
Can Apple's Live Captions translate a video playing in VLC or IINA?
No. macOS Live Captions transcribes the audio of any app in the language being spoken, in the eight languages Apple lists for the current macOS release. It does not translate into another language.
Does Alison Workspace open or upload the video file?
No. It never touches the file. It listens to the audio your Mac is playing through the player you already use, and after the one-time download of language resources, recognition and translation run on the Mac. Nothing is uploaded.
Will I get an SRT file I can keep?
Not one synced to the video. The session history can be exported as text or SRT, but its timestamps count from when you pressed Start, not from the video's timecode. For a properly timed subtitle track to keep or share, use a file-based transcription tool.
Which languages can it recognize and translate?
Recognition offers 101 choices covering 100 spoken languages. Translation offers up to 21 target languages, depending on the Apple language resources available on your Mac; the app checks what is installed and lists the targets it can use.
Does it work with films from the Apple TV app or other stores?
Not necessarily. Protected content may not expose its audio to capture, and store terms may prohibit it. Test with a permitted file, and respect the terms of the service you bought the film from.