gstreamer and ffmpeg can both fill the same niche, but not completely. gstreamer is plugin based while ffmpeg is monolithic. gstreamer has a plugin for ffmpeg, while the reverse is (or wasn't last i checked) isn't true.
You need pipewire, pulse, or plain alsa to actually play the audio streams. Not a lot of overlap most of the time with gstreamer or ffmpeg unless you're dealing with raw streams.
gstreamer and ffmpeg can both fill the same niche, but not completely. gstreamer is plugin based while ffmpeg is monolithic. gstreamer has a plugin for ffmpeg, while the reverse is (or wasn't last i checked) isn't true.
You need pipewire, pulse, or plain alsa to actually play the audio streams. Not a lot of overlap most of the time with gstreamer or ffmpeg unless you're dealing with raw streams.