.m4v format is not supported.
When we create an .epub3 book for Apple devices, we use the .m4v format to store our videos in the assets. Calibre after 1.23 suddenly supported this format until 1.27 .
I just cannot understand why in 2014 Calibre, an amazing program, is not able to function under the simple needs of an .epub3 .
Thank you.
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