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Detect file by mime type - not filename extension #149

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@T-3B

Hello!
I wanted to know it would be possible for ECT to detect the file type from the mime type (file --mime-type), instead of relying on the filename extension ?

It is not uncommon to see a "file.png" which is actually a JPG (and vice versa). ECT will try to optimize it as a PNG, but fails and displays decoding error 28: incorrect PNG signature, it's no PNG or corrupted.
I would like to have a way to still optimize these files, which have an incorrect filename extension. Either by forcing ECT to use JPG optimizer --force-jpg, or (preferably) by having ECT detect file types from mime types.

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