drewnoakes/metadata-extractor

Detect incorrect makernote offsets

Open

#404 opened on Jun 5, 2019

View on GitHub
 (6 comments) (1 reaction) (2 assignees)Java (2,411 stars) (470 forks)batch import
format-maker-noteshelp wantedimage-queue

Description

[FEATURE REQUEST]

Copied from https://stackoverflow.com/q/56445656/432844

EXIFTool can detect when the offset of tags is incorrect

[ExifTool] Warning : [minor] Possibly incorrect maker notes offsets (fix by 1060?)

Can we detect incorrect offsets with metadata-extractor and ideally fix them in the same way?

Contributor guide

Tech stack
java
Domain
data
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaEXIF metadatamaker notes conceptmetadata extractor library structure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate how EXIFTool detects incorrect maker notes offsets, as referenced in the StackOverflow link. Explore the metadata extractor codebase to understand current maker notes parsing, focusing on ExifReader and MakerNotesDirectory classes. Determine if a similar offset fix (e.g., adjusting by 1060) can be applied. Review the linked SO thread for additional context and ensure the fix integrates cleanly with the library's existing architecture.