MobileRead Forums - View Single Post - Upgraded to Calibre 4 and all my book covers are gone.

kovidgoyal · 10-08-2019, 05:33 AM

Yeah 3.x is a different, much older version of Qt. So it's not surprising. I doubt 4.1 will help, there were no Qt image plugins or build changes.

You could try getting some debug output using the environment variable QT_DEBUG_PLUGINS=1 to see why Qt is failing to load its image plugins on your system.

Something like

Code:

set QT_DEBUG_PLUGINS=1
calibre-debug -c "from PyQt5.Qt import *; app = QApplication([]); print(QImageReader.supportedImageFormats())"

10-08-2019, 05:33 AM	#29
kovidgoyal creator of calibre Posts: 45,432 Karma: 27757438 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yeah 3.x is a different, much older version of Qt. So it's not surprising. I doubt 4.1 will help, there were no Qt image plugins or build changes. You could try getting some debug output using the environment variable QT_DEBUG_PLUGINS=1 to see why Qt is failing to load its image plugins on your system. Something like Code: set QT_DEBUG_PLUGINS=1 calibre-debug -c "from PyQt5.Qt import *; app = QApplication([]); print(QImageReader.supportedImageFormats())"