How to check a video or audio codec
Select one local recording. The extension is shown separately from its detected format.
Select Analyze File. A local worker reads the chunks requested by the metadata parser.
Read summary cards and individual video, audio and subtitle tracks. Switch to Advanced View for all returned fields.
Review private metadata before copying information or downloading JSON / TXT. Your original file stays unchanged.
Check the codec inside an MP4 file
MP4 is a container, not a codec. A recording can contain AVC / H.264, HEVC / H.265 or another video format, together with AAC or another audio format. This inspector shows container metadata separately from each track’s codec and Codec ID. It does not choose a format from the filename.
Resolution, frame rate and multiple tracks
View width, height, display aspect ratio, reported frame rate and CFR / VFR mode when available. Video and audio bitrates are separate from overall bitrate. Each detected video, audio and subtitle track has its own card with available language and format fields. Advanced View retains extra fields, tags, color / HDR information and additional track types reported by the parser.
Private inspection with bounded local reads
MediaInfoLib runs in a dedicated browser worker and requests file slices rather than a complete copy of a large video. No audio/video decoder or encoder is used to rewrite the file. The parser assets download from this website on Analyze; the parser is not loaded on the homepage. Cancelling, selecting another file, or leaving the tool terminates the worker. File references and generated report URLs are released on clear or navigation.
What an inspection can and cannot tell you
The file picker and the parser report different things: file name, extension and byte size come from your local file; container and track fields come from MediaInfo. Some formats do not store bitrate, bit depth, language or frame rate mode, and some damaged files expose only partial metadata. No missing value is guessed. Inspection does not play every frame, verify every payload byte, or prove compatibility with a particular app.
To explore supported conversion options, open the corresponding converter and check its actual format/codec limits. Video Converter · Audio Converter