Drop a media file and read its key facts: container, duration, video codec with resolution and frame rate, audio codec with channels and sample rate, and the overall bit rate — the fields MediaInfo shows, in a browser tab.
The bytes are parsed locally: MP4/MOV via ISO-BMFF box walking, WebM/MKV via EBML elements, WAV via RIFF chunks. Unknown containers fall back to what the browser itself can decode. Nothing is uploaded, ever.
Frequently asked questions
Which containers are supported?
MP4, MOV and M4V (ISO-BMFF), WebM and MKV (EBML), and WAV (RIFF). Others (avi, flv…) fall back to browser metadata: dimensions and duration, but no codec string.
Why is the frame rate sometimes missing?
It is computed from the sample-to-timestamp table (stts); variable-frame-rate or edited files may produce no clean table, and the field is simply left out rather than guessed.
中文说明
拖入媒体文件读取关键信息：容器、时长、视频编码与分辨率帧率、音频编码与声道采样率、总码率——相当于浏览器里的 MediaInfo。
字节全程本地解析：MP4/MOV 走 ISO-BMFF box 遍历，WebM/MKV 走 EBML 元素，WAV 读 RIFF 块；未知容器由浏览器解码兜底。文件绝不上传。
常见问题
支持哪些容器？
MP4、MOV、M4V（ISO-BMFF），WebM 与 MKV（EBML），以及 WAV（RIFF）。其他（avi、flv……）走浏览器元数据兜底：有分辨率和时长，但没有编码名。
为什么有时没有帧率？
帧率由采样-时间戳表（stts）计算；可变帧率或剪辑过的文件可能没有干净的时间表，此时宁缺毋滥。