[Mp4-tech] (no subject)

[Shankar Jayaraman]

Adam,
I'm giving pointers to the specific fields that you require.
The bitrate, width and height of the movie can be obtained from the 'esds' 
atom of the Video Track.
Look for the fields maxBitRate, avgBitRate, video_object_layer_width and 
video_object_layer_height within this atom.
Thanks,
Shankar.
>  ----- Original Message ----- 
>  From: Adam Potolsky
>  To: Mp4-Tech Mailing List
>  Sent: Wednesday, August 30, 2023 12:50 AM
>  Subject: [Mp4-tech] (no subject)
>
>
>  Good day,
>
>
>
>  I am in the process of creating some code to gather various forms of data 
> from MP4 files, as well as, mpeg4 media content. Thus far I have been 
> successful in parsing boxes to gather information like the title of the 
> content (if present), etc. The difficulty I am having now is in trying to 
> get more technical information such as the bitrate, and the height and 
> width of a movie. Through my searches I have not found a source that 
> describes how this kind of data can be extracted from a file. I assume 
> it's inside the 'mdat' box data, but trying to figure out what to expect 
> there form the thousands of pages of reference I have is very difficult. I 
> have also looked through several source code solutions and they have been 
> quite difficult to understand as they have lacked good source level 
> comments and are not self documenting.
>
>
>
>  Is there a good source for this kind of information? Or, alternately, can 
> anyone key me off to what I'm missing about how to read the various specs 
> and code I have? (I have ISO/IEC 14496-lots, The MPEG Handbook, mplayer, 
> the reference source from ISO, and more.)
>
>
>
>  Thank you very much in advance for any help you can be.
>
>  Adam Potolsky
>
>