How to select parts of a RealMedia stream from the command-line
If you want to play a sub-selection of a RealAudio or RealVideo stream, given a pair of start and end times, you can use URL syntax, with start and end parameters. For example:
realplay 'rtsp://real.npr.na-central.speedera.net/real.npr.na-central/news/20040830_news_rnc02.rm?start=39:53&end=41:21'