ffprobe - why total bitrate is greater than sum of video and audio bitrates? I have been working on video conversion. So, to find out video parameters I used ffprobe. However, when I run the command on an mp4 video file, I observe this:

 

Total bitrate: 3547 Kb/s 
Video bitrate: 3512 Kb/s
Audio bitrate: 32 Kb/s

Why total bitrate is 3 Kb/s more than the sum of audio and video bitrates?
I don't know for sure, but the total bitrate may be calculated as size / duration, which would include the container overhead. IOW the actual bit rate would be the sum of the two stream rates, with the container overhead shown as distributed over the entire length.