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Possibly? Who knows? Parsers are complex and I doubt ffmpeg relies on file extensions to figure out the format.

It does not, that's covered in the original article.

It does not what? Can you share quotes from the article or the translated article source you read?

Confusion:

Are you saying that ffmpeg doesn't detect file by extension?

or

Are you saying that ffmpeg won't execute the malicious code if it's found appended to a valid video?