Create a CDN resource for video streaming

• You need transcoding (raw RTMP/SRT input)
• You want automatic quality ladder generation (ABR)
• You’re streaming from encoders (OBS, vMix, hardware encoders)
• You need DVR (pause/rewind) or recording features
• You want an all-in-one hosted solution

• Origin type: Storage
• Storage: Select your Gcore Storage bucket
• Path (optional): /videos if VOD files are in a subfolder

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Step 1: Enable “Always online” (Recommended)

1. Go to CDN Resource > Cache
2. Enable “Always online” with these settings:
   • Check error (serve stale cache if origin returns errors)
   • Check timeout (serve stale cache if origin times out)
   • ⚠️ Uncheck “updating” (important - conflicts with internal optimizations)

• If origin goes down, viewers can still watch cached videos
• Prevents “origin unavailable” errors from affecting users
• Especially important for high-traffic VOD platforms

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Step 2: Set long-term cache for all content

1. Still in CDN Resource > Cache
2. Set CDN cache expiry time: 1 year (31536000 seconds)
   • This caches all successful responses (2xx, 3xx) for 1 year
   • VOD content doesn’t change, so aggressive caching is safe
3. Set Custom cache time for 404 errors: 1 second
   • Protects origin from repeated requests for non-existent files

• VOD files never change once uploaded
• Maximum cache efficiency = minimum origin load
• Can be purged manually if needed

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Step 3 (Optional): Large file optimization (for MP4)

1. Go to CDN Resource > Content
2. Enable Large files delivery optimization
   • Enables HTTP range requests for seeking
   • Important: Your origin must support Range requests
   • Note: Enabling this will invalidate existing cache

• Origin server supports HTTP Range Request (Content-Range headers)
• If using origin group, files must have identical Content-Length and ETag across all origins
• Do not enable GZIP compression when using large file optimization

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Step 4 (Optional): Query string handling

1. Go to CDN Resource > Cache
2. Enable Ignore query string if:
   • Your VOD URLs don’t use query parameters for logic
   • You want to cache video.mp4?ref=email and video.mp4?ref=social as the same file
3. Ask customer first - they may have analytics or tracking in query params

• Manifests: .m3u8, .mpd
• Segments: .ts, .m4s, .m4v, .m4a, .m4i
• Progressive: .mp4, .webm
• Subtitles: .vtt, .webvtt, .ttml

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What is Chunked-Proxy?

• Immediate distribution: CDN edge sends bytes to viewers while receiving from origin
• Protocol optimization: Uses Chunked Transfer Encoding (HTTP/1.1) and Framing (HTTP/2/3)
• 2-4 second latency: Achieves true low-latency for LL-DASH streams

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Request Chunked-Proxy activation

1. Contact Gcore Support or your account manager
2. Request Chunked-Proxy module activation for your CDN resource
3. Provide:
   • Your CDN resource ID or domain
   • Confirmation that you’re using LL-DASH with CMAF segments
   • Your origin transcoder details (Wowza, Nginx-RTMP, etc.)

• Your LL-DASH streams will achieve 2-4 second latency
• CDN will stream chunks immediately as they’re received from origin

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Cache configuration

• Pattern: ^/.+\.mpd$ (for DASH manifest files instead of .m3u8)

• Manifests: .mpd
• Segments: .m4s, .m4v, .m4a, .cmfv, .cmfa
• Initialization: .mp4 (init segments)

1. Fully custom cache settings, contact the support team for more information