ffmpeg:tldr:2bc16

This command is using the ffmpeg software to manipulate video files. Let's break down each part of the command:

• ffmpeg: This is the executable command for the ffmpeg software, which is a powerful multimedia framework that can process audio and video files.

• -i ${frame_%d-jpg}: The -i option is used to specify the input file(s) or source. In this case, ${frame_%d-jpg} is a variable representing a pattern for input files. %d is a placeholder that will be replaced by sequential numbers, and -jpg indicates that the input files should have a .jpg extension. For example, if the pattern is frame_%d.jpg, it will match files like frame_1.jpg, frame_2.jpg, etc.

• -f image2: The -f option specifies the output format. In this case, image2 is used to indicate that the output format should be a series of individual image files.

• ${select}: This is likely another variable that represents some form of filtering or selection applied to the input frames. Without more context, it's not possible to determine its exact purpose.