我对 HEIC 缩略图有疑问。
我可以heic通过图像查看器打开文件，但是无法显示缩略图。
当我尝试heif-thumbnailer通过运行安装时
sudo apt-get install heif-thumbnailer
我收到以下消息：
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
heif-thumbnailer : Depends: libheif1 (= 1.9.1-1~ppa1~ubuntu20.04.1) but it is not going to …我有一个偶数页的pdf文档，比如2n，我想将它分成n个文档，比如pages1_2.pdf，pages3_4.pdf，.....，pages2n-1_2n.pdf，每个文档由 2 个连续的页面组成。更准确地说，对于区间 {1..2n} 中的任何 i，第 i 个文件应由原始文档的第 2i-1 页和第 2i 页组成。
pdftk 似乎没有专用函数，但 for 循环可以实现这一点。
你能帮我写正确的剧本吗？先感谢您