sub2srt is a Python script designed to help you convert subtitle files that use the .sub file format to the .srt standard. First, you need to open a Terminal window and navigate to the project's folder. The next step is to run the sub2srt Python script and get the usage details: sub2srt-python input.sub output.srt fps. Then, you need to employ the command line to run the script and then provide the appropriate parameters. When all settings are done, the sub2srt script will produce the desired .srt file.
