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I am writing some code to parse MP4 files ...
Is there a free source to get documentation on the MP4 File Format Specification. So far I have only found an ISO document which I would need to purchase ISO PDF. Is MP4 Not an open standard ?
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Here's the specification of the ISO base format, and here is the MP4 file format specification, both defined as part of the ISO/IEC 14496 standard.
Also take a look at the QuickTime MP4 specification. It has a very clear explanation.
The latest ISO doc is ISO/IEC 14496-12:2015. And you can download it at Licence Agreement... for free.
"ISO 14496-1 Media Format" gives a detailed description of the MP4 layout: