subprojects/gst-devtools/validate/data/scenarios/switch_audio_track.scenario

   1 description, summary="Change audio track at 5 second to the second audio track", min-audio-track=2, duration=10.0, min-media-duration=5.1
   2 switch-track, name=Next-audio-track, playback-time=5.0, type=audio, index=(string)+1
   3 stop, playback-time=10.0