Codex App: Clicking on mp4 video files opens them up in diff as garbage text
Resolved 💬 3 comments Opened Apr 11, 2026 by nelsonjchen Closed Apr 25, 2026
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of the Codex App are you using (From “About Codex” dialog)?
Version 26.409.20454 (1462)
What subscription do you have?
Pro 20X
What platform is your computer?
Darwin 25.3.0 arm64 arm
What issue are you seeing?
Clicking a MP4 mentioned in the conversation shows this garbage text data from the binary.
<img width="691" height="660" alt="Image" src="https://github.com/user-attachments/assets/2387e2c0-3a6b-42fe-ac34-b95e47a584cd" />
As a contrast, clicking an image metioned in the conversation shows an image decoded correctly.
What steps can reproduce the bug?
Have Codex generate a MP4 of some sort from a task and mention it. Click on the mp4 file in the task conversation. Get binary text garbage.
What is the expected behavior?
In the past, it opened it in Finder so I could view it or maybe QuickTime or something, idk. Whatever it did, it didn't show garbage.
Additional information
_No response_
3 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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Checked those. Nope.
This was just a really, really recently released Codex version.
Not a thing anymore in the current GUI.