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I’ve been shopping for something that does a per-byte description of the content of visual media formats (jpeg, png, avi, mp4, etc). Anyone know of one?
by escapecharacter 2y ago
I’ve been shopping for something that does a per-byte description of the content of visual media formats (jpeg, png, avi, mp4, etc). Anyone know of one?
- freeone3000 2y agoThis sounds like the format specification? What are you looking for that is not a document?
- escapecharacter 2y agoI want to drop a specific image in, and have a reader that debugs this. Sometimes images don't follow specs exactly, or stretch them in fun ways, and sometimes this leads to inconsistent behaviour across platforms. Sometimes passing an image through a platform strips or reformats this data. The current context for me is I'm exploring various non-steganography approaches to embed metadata in photos. In the past, I've built custom formats to embed streaming data side-by-side: https://github.com/dustinfreeman/kriffer https://github.com/dustinfreeman/kriffer
- moritonal 2y agoReally impressed this site is still running. They'll have what you want https://formats.kaitai.io/ https://formats.kaitai.io/
- nayuki 2y agoI did PNG: https://www.nayuki.io/page/png-file-chunk-inspector https://www.nayuki.io/page/png-file-chunk-inspector