Calling external processes

Within your command-line application, you may need to call some external processes. Sometimes, there are Golang libraries offered for third-party tools that function as a wrapper. For example, Go CV, https://gocv.io/, is a Golang wrapper offered for OpenCV, an open source computer vision library. Then, there’s GoFFmpeg, https://github.com/xfrr/goffmpeg, which is a wrapper offered for FFmpeg, a library for recording, converting, and streaming audio and video files. Often, you need to install an underlying tool, such as OpenCV or FFmpeg, and then the library interacts with it. Calling these external processes then means importing the wrapper package and calling its methods within your code. Often, when you dive into the code, you’ll find that these libraries provide a wrapper for the C code.

Besides importing a wrapper for an external tool, you may call external applications using the os/exec Golang library. This is the main purpose of the...