MP4 is video plus an audio track
MP4 is the default container for screen recordings, phone video, webinars, and most exported footage. Inside it sits a video stream and at least one audio track, and transcription only needs that audio, which FastScribe separates out for you automatically on upload.
You do not need a separate tool to demux or convert the file. Drop the MP4 in the box above and the system reads the audio track directly, so a screen recording of a meeting becomes searchable text without any manual prep.
What you can do with the transcript
A written version of a video is far easier to skim, quote, and repurpose than scrubbing a timeline. Turn a recorded talk into notes, pull a pull-quote for social, or build a searchable archive of everything that was said on screen.
For captions, export SRT or VTT and load them back into your player or editor, where the timestamps drop each line onto the right frames. Choose TXT for a plain read or DOCX on Pro when you want a formatted document.
Frequently asked questions
Do I need to extract the audio from my MP4 first?
No. FastScribe pulls the audio track out of the MP4 for you during upload, so you can send the whole video file and still get clean text back.
Can I caption the MP4 with the transcript?
Yes. Export SRT or VTT and the timestamps line each caption up with the video, so you can drop the subtitle file straight into your editor or player.
How long an MP4 can I upload?
The free first file allows ten minutes, a free account up to thirty minutes, and Pro handles video up to five hours and two gigabytes for full webinars or recordings.