Container and codec are separate details
A container such as MKV or MP4 can hold different video, audio and subtitle codecs. Inspecting both helps explain compatibility and conversion behavior.
Media tools
Media Info & Codec Inspector
See which container, codecs and streams a media file actually contains before you convert, extract or troubleshoot it.
Your selected media bytes are processed in your browser and are not uploaded to Voice2Sub.
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Use the report for troubleshooting
Copy the readable summary for quick checks or download the raw JSON when you need the underlying probe data.
How to use this tool
- Choose a local media file and let the inspector read its tracks.
- Select the required track and output mode when applicable.
- Run the operation and inspect the report or verified download.
Supported input and output
- Input
- Local media file
- Output
- Inspection report
Questions about this tool
Why is the extension different from the detected container?
A file name can be changed without changing its contents. The detected container and stream facts are more useful than the extension alone.
Do my files or text leave this device?
Your source content is processed in this browser, not uploaded for processing. The browser may download a processing engine from Voice2Sub’s CDN. Those engine requests do not contain your source file.
Need subtitles created automatically from audio or video?Voice2Sub can transcribe spoken audio when you need a complete subtitle workflow instead of a file utility.
Download Voice2Sub →