Item 1 - Minimal Valid
Tests the minimum required attributes for alternateEnclosure: only type (required) and a single source element. No optional attributes are included.
v4vmusic.com Alternate Enclosure Test Feed
A collection of items with various permutations of the podcast:alternateEnclosure tag for testing purposes
Subscribe:.rss.atom.json.md.m3u.pls
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Item 2 - Full Audio All Attributes
Tests all optional attributes (length, bitrate, title, rel, codecs, default) with multiple alternateEnclosure elements offering different audio codecs (MP3, Opus, AAC) and quality levels.
Item 3 - Audio/Video Mixed
Tests the primary use case of allowing apps to switch between audio and video playback. All alternateEnclosures share rel="default" to indicate they are the same content in different formats. Includes height attribute for video resolution selection.
Item 4 - Multi-Language
Tests the lang attribute (BCP 47 language tags) with the same content available in English, Spanish, and German. Apps should use this to offer language selection.
Item 5 - Alternative Transports
Tests multiple podcast:source elements within a single alternateEnclosure, offering the same file via different transport protocols: HTTPS, IPFS, and BitTorrent. The torrent source uses contentType attribute. NOTEL THIS IS NOT SET UP YET FOR IPFS OR TORRENT
Item 6 - Companion Content
Tests the rel attribute to provide companion content that is NOT the same as the main enclosure. Different rel values (commentary, instrumental, acapella) indicate supplementary tracks that apps can offer alongside the main content.
Item 7 - Edge Cases
Tests edge cases: FLAC lossless audio format, WebM audio-only container, and intentionally omitting the recommended length attribute to verify parser resilience.
Item 8 - Video Main with Audio Alternate
Tests the reverse of Item 3: video as the main enclosure with audio as the alternate. Common for video-first creators who want audio-only apps to have a fallback. Uses the same media files as Item 3 with roles reversed.
Item 9 - Video Only
Tests a video-only item with no alternateEnclosure elements. Verifies parser handling of video-primary content without any alternatives offered.