How do I accurately convert my M4V files to closed captions? 
Sonix uses the latest automated transcription technology to convert your video files (*.m4v) to closed captions. Follow these six steps and see how magical it is:
Step 1
Sign up for a free Sonix trial account—includes 30 minutes of free M4V to captions conversion.
Step 2
Upload the iTunes Video File file(s) (*.M4V) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Step 3
Choose the language spoken in the uploaded M4V file. We support over 50 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.
Step 4
Sonix will then automatically transcribe the audio from your M4V file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.
Step 5
Use the Sonix AudioText Editor to polish your transcript before we convert it to a caption file. Simply type in your browser to correct any words in your transcript.
Step 6
Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the closed caption version of your M4V file. You can also adjust the character length and time duration length of each caption.
That's it! Your M4V file has now been converted to closed captioning and is ready for the next step in your workflow!
Thousands of customers create closed captions from their M4V files with Sonix 
Frequently Asked Questions for iTunes Video File (*.M4V) to subtitle 
What is a M4V file?
M4V files were developed by Apple and are very similar to the MP4 file format. However, a file with the M4V file extension is called an iTunes Video file (MPEG-4 video file). Some of the M4V files that you’ll encounter may have DRM copyright protection to prevent unauthorized distribution and copying of the video. These files are typically downloaded from iTunes. You can try uploading them to Sonix and we’ll only be able to transcribe M4V files that do not have DRM protection.
Does Sonix transcribe video files with a *.M4V file extension?
Yes, Sonix does automatically transcribe video files with a .M4V file extension. Sonix is an online video to text converter. Convert any audio (mp3, m4a, wav, ...) or video (m4v, mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.M4V files and converts them to text in a subtitle format.
Know anyone who needs to convert iTunes Video File (.M4V) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert M4V to subtitle.
Other ways to convert your M4V video files with Sonix
M4V to text
Use the most accurate speech-to-text technology to convert files: M4V to text.
M4V to docx
Accurately transcribe your M4V file to Microsoft Word Format (docx) so you can bring the transcript into your workflow.
M4V to PDF
Easily transcribe your M4V file to Adobe's Portable Document Format (pdf) so you can share them with colleagues.
M4V to subtitles
Create subtitles for your M4V files to make them more accessible for your audience.
M4V to srt
Quickly create subtitles from your M4V files and save them as SRTs, one of the most widely supported subtitle formats.
M4V to VTT
Create more advanced captions for your M4V files by using the latest caption format VTT (Video Text Tracks).
Add subtitles to M4V files
Quickly and easily add subtitles to your MP4 video files with the power of automated transcription.
Create closed captions from your iTunes Video File files with Sonix 
Sonix automatically transcribes and translates your audio/video files in 50+ languages. Easily search, edit, and share your media files. Sonix is an online, fully-automated speech to text service that quickly converts iTunes Video File files to captions. Fast, accurate, and affordable. Millions of users from all over the world.
Includes 30 minutes of free transcription
