I use a program called ImageWalker which is free and is a great little app for batch processing images, coversions, rename, resize, rotate and tons more, plus will allow you to create custom actions so you can do what you want to batch images.
Theres a bit of code in the jpg that tells it the rotation. Some programs rotate images by simply editing the orientation value and leaving the compression intact. Whereas other programs re-compress the image completely
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