Is this the bitrate written in the header?
No. It is computed from packet sizes and timestamps.
Check a video’s real bitrate
Measure average video and audio bitrate from actual packets. Useful before a delivery, an upload cap, or a “why is this file huge” check.
Frequently asked questions
Why not just divide file size by duration?
That mixes video, audio, subtitles, and container overhead. Per-track averages are more useful.
Do you upload my video?
No. Packets are read locally.
How many packets are inspected?
About 512 per track — enough for a stable average on typical clips.
Can I see FPS here too?
Use the FPS checker for the lattice. This page is only about bits per second.
What if there is no video track?
Audio-only files still get an audio bitrate.