Video Metadata Viewer

Container format, file size, duration, and — when present — video resolution, rotation and codec, plus audio codec, channel count and sample rate.

Yes. MP3, WAV, M4A, FLAC and others are supported — the video rows simply do not appear when there is no video track.

They are the exact codec profiles inside the file. "avc1" is H.264 video and "mp4a.40.2" is AAC audio — the pair a normal MP4 uses and the one that plays almost everywhere. Other prefixes tell you why a file might be picky: "hvc1" or "hev1" is HEVC (H.265), "vp09" is VP9, "av01" is AV1 — newer codecs some players and editors do not accept yet. When a file will not play or upload, this string is usually the reason, and it points you at which converter to run.

Often, yes. The three things that trip up players and upload forms are the container (the .mov or .mkv wrapper), the video codec and the audio codec — and this shows all three at once. If a site rejects your video, compare what it reads here against what that site accepts: an unusual container points you at a convert-to-MP4 tool, a newer codec like HEVC or AV1 explains an "unsupported" error, and a missing audio codec line explains silent playback.

No — it only reads the headers and reports what is there; your file is never modified and never uploaded. Think of it as the diagnosis, not the repair: once you know the container and codecs, the matching converter (MOV/MKV/WebM to MP4, or an audio converter) is what actually changes the file. Reading the headers is instant because it does not decode the whole thing, just the small index at the start.