OT: MediaInfo question

BobMoyer wrote on 8/6/2014, 10:44 AM

I recently opened a video file via MediaInfo and I have a question or two about the results of its analysis:

Under 'General', it lists "Overall bit rate" as 570 Mbps and "Maximum Overall bit rate as 28.0 Mbps

Under 'Video', it lists "Overall bit rate as 547 Mbps and "Maximum bit rate as 25.0 Mbps

This is for a .mts file 1920x1080/60i/59.940 fps.

I was just curious as to why there is a difference between the listed values.

Bob

Comments

NormanPCN wrote on 8/6/2014, 11:58 AM

Overall is the sum of the audio and video bitrates.

I have not seen the "overall" word used in the video section. Only in the general section.

BobMoyer wrote on 8/6/2014, 2:58 PM

Thank you for your response. Being an amateur, I appreciate the information.

Bob

amendegw wrote on 8/6/2014, 3:38 PM

Hmmm... the Overall Bit Rate is reported as over 20 times the maximum? That's strange, I would think the maximum should always be greater than or equal to the the overall.

...Jerry

farss wrote on 8/6/2014, 3:51 PM

I think "Overall bit rate" should read "Average Overall Bit Rate", just to be clear.

Bob.

John_Cline wrote on 8/6/2014, 4:44 PM

Since MediaInfo doesn't actually read all the data in a file, it ends up looking at the field in the header to see what the encoder wrote as the maximum encoded bit rate (sometimes this value can be wildly inaccurate) and then for average bit rate it takes the file size in bytes, subtracts the size of the audio portion of the file, and divides it by the length of the file in seconds. If you really want to know the maximum and average bit rate of the video portion of a file, use the bitrate viewer linked below, it actually decodes the video. It works mostly on files encoded using MPEG2 and h.264/MP4.

http://www.videohelp.com/tools/Bitrate-Viewer-2