File Juicer
File Juicer for macOS
Overview of Formats

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

ram, ra, rmvb - Real Audio and Video

Real's format does not contain any of the formats File Juicer recognizes.
Audio Hijack can record audio from any application.
To convert Real Audio files to other formats you can try ffmpegX which can handle many video formats.
Important: ffmpegX rely on other tools you should download, and reallib is needed to handle Real's files.