At this time, ART19 is an audio-only platform. We are investigating supporting video in the future as it gains more traction in the podcast space, but today it's not widely supported.
Listening apps that offer video components use their own video hosting, and do not ingest via 3rd party RSS feeds. We're closely monitoring the space though and will be sure to update our customers as things develop.
If you have further questions please reach out to support@art19.com