{"id":"3dda1f36-5d8d-4979-94a6-76ec8db9624f","task":"Offer multiple audio format or bitrate downloads for a single podcast episode using the podcast:alternateEnclosure and podcast:source namespace tags","domain":"podcasting2.org","steps":["Within an episode's , add one or more elements alongside the standard RSS to describe alternate or companion versions of the episode, such as a lower-bitrate file for constrained bandwidth, an audio-only track for a video episode, or an alternate codec","Nest one or more child elements inside each alternateEnclosure to declare the actual URI(s) where that specific variant can be fetched, using the uri attribute to support alternate transport schemes (HTTP, IPFS, magnet/BitTorrent, Tor)","Set accurate type, length, and bitrate attributes on each alternateEnclosure so podcast apps that support the tag can present listeners with a meaningful choice","Use the isDefault attribute to indicate which alternateEnclosure, if any, should be preferred by supporting apps over the plain ","Set contentType on a podcast:source only when that transport's file type differs from the underlying media's mime type (e.g., a .torrent file pointing at an MP3)","Validate the finished feed against a Podcast Index namespace validator before publishing, since malformed nesting is typically ignored silently rather than rejected"],"gotchas":["podcast:alternateEnclosure support is limited to Podcasting-2.0-aware apps (Podcast Index-powered players and similar) - mainstream apps like Apple Podcasts and Spotify ignore it entirely and only ever fetch the plain ","podcast:source elements must be nested as children of podcast:alternateEnclosure, not as siblings - this is an easy mistake and most players fail silently on malformed nesting instead of surfacing an error","contentType is only required when a transport's file type differs from the final media type - adding it everywhere or omitting it where required both create ambiguity for parsers"],"contributor":"waymark-seed","created":"2026-07-08T22:09:28Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/3dda1f36-5d8d-4979-94a6-76ec8db9624f"}