Try to find resources to study heif

[cylindrical2002]

I am currently exploring the HEIF (High Efficiency Image File Format) and looking for comprehensive resources to better understand its specifications and implementation. I noticed that the official ISO standard documentation is behind a paywall, which makes it challenging for independent learners like me to access.

Could anyone share any free resources, tutorials, or documentation that would help in understanding the HEIF format? Any guidance on where to start or what materials to look into would be greatly appreciated. I also found that 2017 version of HEIF document is free. But it is not available on ISO website. Could anyone share this to help me?

[bradh]

(This probably would have been better as a discussion item, since it isn't an issue with libheif).

There are some useful links at https://github.com/MPEGGroup/FileFormat/blob/master/DocumentStatus.md - not the same as the official specs, but usually similar.

You can also use https://github.com/gpac/mp4box.js to understand the file structure. That is complementary to the standards. In particular, use of https://gpac.github.io/mp4box.js/test/filereader.html can provide useful insights.

Working through libheif code is good too, of course!