  Video podcast teasers are short videos that can be shared on social media
platforms to capture interest in the full episodes of a video podcast. These
teasers enable long-form podcasters to reach new audiences and gain new
followers. However, creating a compelling teaser from an hour-long episode is
challenging. Selecting interesting clips requires significant mental effort;
editing the chosen clips into a cohesive, well-produced teaser is
time-consuming. To support the creation of video podcast teasers, we first
investigate what makes a good teaser. We combine insights from both audience
comments and creator interviews to determine a set of essential ingredients. We
also identify a common workflow shared by creators during the process. Based on
these findings, we introduce a human-AI co-creative tool called PodReels to
assist video podcasters in creating teasers. Our user study shows that PodReels
significantly reduces creators' mental demand and improves their efficiency in
producing video podcast teasers.
