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In addition to what others have said, there's also gstreamer and its suite of plugins. I find gstreamer a bit easier to work with, although both are very complex pieces of software and each have their own quirks.

If you're looking for audio production work, there's Ardour, although I haven't used it myself. http://ardour.org/

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Does gstreamer have a command-line interface in addition to the libraries?

Indeed it does; it's about as complex as ffmpeg, and in my opinion has a somewhat more intuitive interface for building up complicated pipelines of processing steps:

https://gstreamer.freedesktop.org/documentation/tools/index....

There is a "test tool" for gstreamer pipelines: gst-launch, but generally it's encouraged to run the gstreamer more as a library instead.

Example, if you have gstreamer libs installed:

gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink

You can use gst_parse_launch to create a pipeline using the launch syntax.

I've found this helpful to prototype with gst-launch-1.0 and then pull into a separate program down the road. I found it to be pretty hairy trying to create and link all the individual elements manually in complex pipelines.

https://gstreamer.freedesktop.org/documentation/gstreamer/gs...

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