Per this email thread https://mail.xfce.org/pipermail/xfce/2019-November/036756.html additional details are needed for tumbler documentation here: https://docs.xfce.org/xfce/thunar/tumbler Image Thumbnailers JPEG-thumbnailer - Details missing. Please add, if known - Is that plugin still needed ? Pixbuf-thumbnailer as well supports jpeg. Is this plugin faster ? Video Thumbnailers Cover-thumbnailer Downloads video covers from omdbapi.com or themoviedb.org. See details below ffmpeg-thumbnailer - Details missing. Please add, if known - Requires package: ?? GStreamer-thumbnailer - Details missing. Please add, if known - Requires package: ?? Other Thumbnailers Font-thumbnailer - Details missing. Please add, if known -
Here you can check dependencies (most of them depend on GdkPixbuf but it's not really needed): https://git.xfce.org/xfce/tumbler/tree/acinclude.m4 And at each provider you may know the mime types of each thumbnailer: https://git.xfce.org/xfce/tumbler/tree/plugins/ffmpeg-thumbnailer/ffmpeg-thumbnailer-provider.c?id=a33a18e#n102 HTH
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