How to use the video info viewer
- Drop a video onto the box or click to choose one.
- For AVI, WMV, FLV, MPG, OGV and other rare formats, tick Allow the ffmpeg fallback for rare formats (≈30 MB, loaded once). Common files such as MP4, MOV, WebM and MKV do not need it.
- Press Read details.
- Read the summary (duration, resolution, frame rate and size) and the All details table below it. Press CSV to save the table.
What it does and when to use it
Before you upload, edit or archive a video, it helps to know exactly what it is. The viewer answers questions such as: is this H.264 or HEVC? Is it really 60 fps? Is it HDR? How many audio channels does it have? Why does an upload form reject it? It also shows title, artist, comment, genre and date tags when the file has them.
Use the numbers to choose settings in other tools. The bitrate tells you where to start in the video bitrate changer, the frame rate guides the video frame rate changer, and the resolution helps you pick a size in the video resizer. If a file is not decodable here, try the video converter with its ffmpeg fallback allowed.
How it works
For common formats, Mediabunny reads the container’s headers in your browser and asks each track for its codec, size, rotation and sample rate. The table shows:
- Overall bitrate = file size in bits ÷ duration in seconds.
- Frame rate = the average number of video packets per second in the sample read.
- Video and audio bitrate = the average data rate of each track in that sample.
- HDR and Decodable in this browser come from the browser’s own media checks.
For rare formats, and only if you tick the box, ffmpeg.wasm (version 0.12.10) is fetched from cdn.jsdelivr.net and runs on your device, listing the lines ffmpeg prints for the input.
Worked examples
- A phone video: an MP4 shows Video codec AVC with its codec string, Resolution 1080×1920 (stored 1920×1080, rotated 90°), a frame rate close to 30 fps, and Audio codec AAC with 2 channels at 48,000 Hz.
- Overall bitrate: a 45,000,000-byte file that lasts 60 seconds gives 45,000,000 × 8 ÷ 60 = 6,000,000 bits per second, shown as 6,000 kbps.
- An AVI with the box unticked: the tool explains that this file needs the ffmpeg fallback instead of reading it.
Limits and tips
- Frame rate is an average. Phone videos often have a variable frame rate, so 29.97 or 59.94 may show as a slightly different figure.
- The ffmpeg summary is plainer than the table and is text only, with a download button.
- Damaged or partly downloaded files may show no duration or fail to open.
Frequently asked questions
What does "Decodable in this browser" mean?
Why does the Frames figure look too low?
Why does the resolution say "stored 1920×1080, rotated 90°"?
How do I read an AVI, WMV or FLV file?
Is my video uploaded?
How do we know nothing is uploaded? Test it yourself on the privacy proof page.