请问如何批量地识别所下载的音视频文件是音频还是视频？

[zhiyuanzhai]

通过 Bilibili-Evolved 下载插件，我批量下载了一套网络课程。初步格式转换后的文件列表如下：

$ ls
10223034_da3-1-100024.mp4  10234880_da3-1-30280.mp4   10786315_da3-1-30066.mp4	 12069151_fh1-1-30066.mp4  12120241_da3-1-30280.mp4  12239935_fh1-1-30066.mp4
10223034_da3-1-30280.mp4   10234881_da3-1-30066.mp4   10786315_da3-1-30280.mp4	 12069152_da3-1-30280.mp4  12120241_fh1-1-30066.mp4  12239937_da3-1-30280.mp4
10223035_da3-1-100024.mp4  10234881_da3-1-30280.mp4   10786316_da3-1-30066.mp4	 12069152_fh1-1-30066.mp4  12120242_da3-1-30280.mp4  12239937_fh1-1-30066.mp4
10223035_da3-1-30280.mp4   10250546_da3-1-30066.mp4   10786316_da3-1-30280.mp4	 12069153_da3-1-30064.mp4  12120242_fh1-1-30066.mp4  12239938_da3-1-30280.mp4
10223036_da3-1-100024.mp4  10250546_da3-1-30280.mp4   10798269_da3-1-30066.mp4	 12069153_da3-1-30280.mp4  12120243_da3-1-30280.mp4  12239938_fh1-1-30066.mp4
10223036_da3-1-30280.mp4   10250547_da3-1-30066.mp4   10798269_da3-1-30280.mp4	 12069154_da3-1-30066.mp4  12120243_fh1-1-30066.mp4  12239939_da3-1-30280.mp4
10223037_da3-1-100024.mp4  10250547_da3-1-30280.mp4   10798270_da3-1-30066.mp4	 12069154_da3-1-30280.mp4  12120244_da3-1-30280.mp4  12239939_fh1-1-30066.mp4
10223037_da3-1-30280.mp4   10250548_da3-1-100024.mp4  10798270_da3-1-30280.mp4	 12069155_da3-1-30066.mp4  12120244_fh1-1-30066.mp4  12239940_da3-1-30280.mp4
10223038_da3-1-100024.mp4  10250548_da3-1-30280.mp4   10798271_da3-1-100024.mp4  12069155_da3-1-30280.mp4  12120245_da3-1-30280.mp4  12239940_fh1-1-30066.mp4
10223038_da3-1-30216.mp4   10250549_da3-1-30066.mp4   10798271_da3-1-30216.mp4	 12073370_da3-1-30280.mp4  12120245_fh1-1-30066.mp4  12239941_da3-1-30280.mp4
10224765_da3-1-30280.mp4   10250549_da3-1-30280.mp4   10820606_da3-1-30066.mp4	 12073370_fh1-1-30066.mp4  12120246_da3-1-30280.mp4  12239941_fh1-1-30066.mp4
10224765_fh1-1-30066.mp4   10275588_da3-1-30280.mp4   10820606_da3-1-30280.mp4	 12073371_da3-1-30280.mp4  12120246_fh1-1-30066.mp4  12250061_da3-1-30280.mp4
10224766_da3-1-30280.mp4   10275588_fh1-1-30066.mp4   10820607_da3-1-30066.mp4	 12073371_fh1-1-30066.mp4  12120247_da3-1-30280.mp4  12250061_fh1-1-30066.mp4
10224766_fh1-1-30066.mp4   10275589_da3-1-30280.mp4   10820607_da3-1-30280.mp4	 12073372_da3-1-30280.mp4  12120247_fh1-1-30066.mp4  12372738_da3-1-30064.mp4
10224767_da3-1-30280.mp4   10275589_fh1-1-30066.mp4   12052537_da7-1-30066.mp4	 12073372_fh1-1-30066.mp4  12120248_da3-1-30280.mp4  12372738_da3-1-30280.mp4
10224767_fh1-1-30066.mp4   10276726_da3-1-30066.mp4   12052537_da7-1-30280.mp4	 12073373_da3-1-30280.mp4  12120248_fh1-1-30066.mp4  12372739_da3-1-30280.mp4
10224768_da3-1-30066.mp4   10276726_da3-1-30280.mp4   12052538_da3-1-30280.mp4	 12073373_fh1-1-30066.mp4  12120249_da3-1-30280.mp4  12372739_fh1-1-30066.mp4
10224768_da3-1-30280.mp4   10286504_da3-1-30280.mp4   12052538_fh1-1-30066.mp4	 12073374_da3-1-30280.mp4  12120249_fh1-1-30066.mp4  12372740_da3-1-30064.mp4
10224769_da3-1-30280.mp4   10286504_fh1-1-30066.mp4   12052539_da3-1-30280.mp4	 12073374_fh1-1-30066.mp4  12120250_da3-1-30280.mp4  12372740_da3-1-30280.mp4
10224769_fh1-1-30066.mp4   10780934_da3-1-30066.mp4   12052539_fh1-1-30066.mp4	 12073375_da3-1-30280.mp4  12120250_fh1-1-30066.mp4  12372741_da3-1-30066.mp4
10234877_da3-1-30280.mp4   10780934_da3-1-30280.mp4   12069148_da3-1-30280.mp4	 12073375_fh1-1-30066.mp4  12239932_da3-1-30280.mp4  12372741_da3-1-30280.mp4
10234877_fh1-1-30066.mp4   10780935_da3-1-30066.mp4   12069148_fh1-1-30066.mp4	 12073376_da3-1-30280.mp4  12239932_fh1-1-30066.mp4  12372742_da3-1-30280.mp4
10234878_da3-1-30216.mp4   10780935_da3-1-30280.mp4   12069149_da3-1-30064.mp4	 12073376_fh1-1-30066.mp4  12239933_da3-1-30280.mp4  12372742_fh1-1-30066.mp4
10234878_fh1-1-30066.mp4   10780936_da3-1-30066.mp4   12069149_da3-1-30280.mp4	 12073932_da3-1-30280.mp4  12239933_fh1-1-30066.mp4  13469977_da3-1-30066.mp4
10234879_da3-1-30280.mp4   10780936_da3-1-30280.mp4   12069150_da3-1-100024.mp4  12073932_fh1-1-30066.mp4  12239934_da3-1-30280.mp4  13469977_da3-1-30280.mp4
10234879_fh1-1-30066.mp4   10780937_da3-1-30066.mp4   12069150_da3-1-30280.mp4	 12120240_da7-1-30064.mp4  12239934_fh1-1-30066.mp4
10234880_da3-1-100024.mp4  10780937_da3-1-30280.mp4   12069151_da3-1-30280.mp4	 12120240_da7-1-30280.mp4  12239935_da3-1-30280.mp4

接下来需要进行一个音视频的合并。目前可以逐一查看并分辨这些文件到底哪些是视频哪些是音频，但不清楚如何批量地识别这些文件并进行合并操作，希望就这一点请教诸位大佬。Thanks!