Saturday Movie Extra: Guadalupe River At Alviso Slough Saturday Movie Extra: 20 seconds (more or less) of video from the world around me. This Saturday: Twenty seconds of the Guadalupe River where it joins Alviso Slough in Alviso, recorded in May 2012. The following music was used for this media project: Music: Aufwind by Sascha Ende Free download: https://filmmusic.io/song/170-aufwind License (CC BY 4.0): https://filmmusic.io/standard-license Enjoy. .