.dirstamp adder alsa appsink appsrc audioconvert audiointerleave audiomixer audiorate audioresample audiotestsrc decodebin encodebin glbin glimagesink libvisual multifdsink multisocketsink opus videorate videotestsrc volume vorbisdec typefindfunctions textoverlay videoconvert videoscale videoscale-[1-6] vorbistag overlaycomposition playbin playbin-compressed playbin-complex playsink streamsynchronizer subparse rawaudioparse rawvideoparse urisourcebin