Unpack a Video
Take the container apart: audio, subtitles and a poster frame.
Take the container apart: audio, subtitles and a poster frame. Free, with no sign-up, no watermark and no upload: it all runs in your browser.
What Unpack a Video is for
For getting at what is inside a container rather than converting it: the soundtrack, the subtitle tracks and a poster frame, each as its own file.
Worth knowing
A video file is a box holding several streams. This opens it and hands you what is inside, copying rather than re-encoding wherever it can.
How to use it
- Add your files. Drop them on the page or choose them. They stay on your device.
- Set the output format and quality. The defaults suit most files.
- Press convert and save the results, individually or as one ZIP.
Questions
What is actually inside a video file?
A container holding separate streams: one or more video tracks, one or more audio tracks, often subtitles, and metadata describing how they line up. The extension names the container, not what is in it.
Is the audio re-encoded?
Not if it can be avoided. The soundtrack is copied out bit for bit into whichever container suits its codec, so nothing is lost. An MP3 is added only when the original codec is one that little software opens.
Why is there no subtitle file?
Because the video has no subtitle track. Captions burned into the picture are part of the image and cannot be separated out.
Where does the poster frame come from?
A third of the way into the clip, which is almost always more representative than the first frame, since videos so often open on black.