Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "How to Record Video in Linux With ffmpeg" video.

  1. 10:43 Tip: the “-y” option tells it to overwrite an existing output file without asking. Yeah, it can be dangerous ...
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  2. 3:49 FFmpeg is actually a suite of tools. Besides the “ffmpeg” executable, there is also “ffprobe” for analyzing the structure of media files, and “ffplay”, which is a basic command-line-based media player. Plus there are a bunch of underlying libraries (libavfilter, libavcodec, libavformat, libswscale etc), that apps can link directly against. Myself, I have written a few programs that made use of FFmpeg. In every case so far, it was easier to spawn the standard FFmpeg executables and feed them suitable command lines, than to try to make use of the libraries myself.
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  3. Like all good reference material, it is not to be read in one sitting. It is something you come back to, from time to time. And each time, you learn something new. That being said, I still can’t quite get my head around filtergraphs ...
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  4. “On top of the operating system is the rest of the system software. Here we find the command interpreter (shell), window systems, compilers, editors, and similar application-independent programs. It is important to realize that these programs are definitely not part of the operating system, even though they are typically supplied preinstalled by the computer manufacturer, or in a package with the operating system if it is installed after purchase. This is a crucial, but subtle, point. The operating system is (usually) that portion of the software that runs in kernel mode or supervisor mode. It is protected from user tampering by the hardware ...” -- Tanenbaum & Woodhull, “Operating Systems Design And Implementation”, third edition, page 3 That is the well-known “MINIX Book”, by the way. So you see, by that definition, Linux is very definitely an ”operating system”.
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