let mkv streams use the range cache

.beads/interactions.jsonl

@@ -48,3 +48,4 @@
 {"id":"int-91b3db21","kind":"field_change","created_at":"2026-05-26T04:40:10.299245Z","actor":"dirtydishes","issue_id":"dreamio-mi1","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Used actual foreground VLC reads as prefetch follow signals on hits and changed foreground misses to fetch aligned chunks; added regression tests and updated the turn document."}}
 {"id":"int-ff0aeb09","kind":"field_change","created_at":"2026-05-26T04:47:44.48931Z","actor":"dirtydishes","issue_id":"dreamio-2hw","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Fixed stale local range-cache prefetch state after cached seek reads and documented the validation."}}
 {"id":"int-204223f5","kind":"field_change","created_at":"2026-05-26T04:56:13.920284Z","actor":"dirtydishes","issue_id":"dreamio-816","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Bypassed the local range cache for Matroska-family tail-index containers and added a regression test confirming MKV probes fall back to direct VLC playback without issuing cache probe requests."}}
+{"id":"int-b6f641ed","kind":"field_change","created_at":"2026-05-26T12:10:16.392655Z","actor":"dirtydishes","issue_id":"dreamio-3sw","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Removed the Matroska/WebM extension-level range-cache bypass and added a regression test proving MKV URLs use the cache when the origin advertises byte-range support."}}

.beads/issues.jsonl

@@ -1,5 +1,6 @@
 {"_type":"issue","id":"dreamio-mun","title":"fix vlc cache loopback port startup","description":"Device logs showed local-cache playback opening http://127.0.0.1:0, because the NWListener ephemeral port was read before the listener reached ready. Wait for the real assigned port before returning the local cache URL.","status":"closed","priority":0,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-25T22:32:41Z","created_by":"dirtydishes","updated_at":"2026-05-25T22:33:15Z","started_at":"2026-05-25T22:33:14Z","closed_at":"2026-05-25T22:33:15Z","close_reason":"Wait for NWListener ready state before returning the local cache URL; verified tests and simulator build.","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"_type":"issue","id":"dreamio-8cz","title":"fix stremio external subtitle loading regression","description":"After adding late subtitle forwarding for native playback, Stremio external subtitle loading is failing. Investigate the injected bridge and native subtitle forwarding path, then adjust behavior so Stremio can still load external subtitles while native playback receives late candidates.","status":"closed","priority":0,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-25T11:05:42Z","created_by":"dirtydishes","updated_at":"2026-05-25T11:07:35Z","started_at":"2026-05-25T11:05:55Z","closed_at":"2026-05-25T11:07:35Z","close_reason":"Hardened subtitle bridge network observers so non-text Stremio subtitle loads are not touched, and made parser traversal deterministic for metadata preservation.","dependency_count":0,"dependent_count":0,"comment_count":0}
+{"_type":"issue","id":"dreamio-3sw","title":"Fix VLC range cache fallback for tail-index MKV streams","description":"Video range caching currently refuses streams classified as tail-index containers, causing VLC playback to use direct mode and lose seek prefetch behavior. Investigate the probe logic and enable safe local range caching for these streams without breaking playback startup.","status":"closed","priority":1,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-26T12:05:20Z","created_by":"dirtydishes","updated_at":"2026-05-26T12:10:16Z","started_at":"2026-05-26T12:05:38Z","closed_at":"2026-05-26T12:10:16Z","close_reason":"Removed the Matroska/WebM extension-level range-cache bypass and added a regression test proving MKV URLs use the cache when the origin advertises byte-range support.","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"_type":"issue","id":"dreamio-816","title":"Fix local range cache playback buffering","description":"Normal VLC playback can stay in buffering after the local progressive HTTP range cache is enabled. Logs show VLC repeatedly probes header/tail MKV ranges through the loopback server while the cache foreground fetch path serializes 1 MB remote requests. Investigate and adjust the cache path so normal direct-file playback can start reliably.","status":"closed","priority":1,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-26T04:54:13Z","created_by":"dirtydishes","updated_at":"2026-05-26T04:56:14Z","started_at":"2026-05-26T04:54:17Z","closed_at":"2026-05-26T04:56:14Z","close_reason":"Bypassed the local range cache for Matroska-family tail-index containers and added a regression test confirming MKV probes fall back to direct VLC playback without issuing cache probe requests.","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"_type":"issue","id":"dreamio-2hw","title":"Fix range cache prefetch cursor after cached seek reads","description":"Skipping after the local range cache has warmed can leave prefetch following an older foreground cursor instead of the post-seek cached read position. Update the cache so cached foreground reads can reset the follow cursor and add regression coverage.","status":"closed","priority":1,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-26T04:45:44Z","created_by":"dirtydishes","updated_at":"2026-05-26T04:47:44Z","started_at":"2026-05-26T04:46:36Z","closed_at":"2026-05-26T04:47:44Z","close_reason":"Fixed stale local range-cache prefetch state after cached seek reads and documented the validation.","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"_type":"issue","id":"dreamio-mi1","title":"adapt vlc prefetch to actual post-seek reads","description":"Use real foreground VLC reads after a seek as a prefetch signal even when they are cache hits, and fetch aligned chunks for partial foreground misses so the cache warms ahead before VLC reaches the edge of retained data.","status":"closed","priority":1,"issue_type":"bug","assignee":"dirtydishes","owner":"dishes@dpdrm.com","created_at":"2026-05-26T04:38:14Z","created_by":"dirtydishes","updated_at":"2026-05-26T04:40:10Z","started_at":"2026-05-26T04:38:16Z","closed_at":"2026-05-26T04:40:10Z","close_reason":"Used actual foreground VLC reads as prefetch follow signals on hits and changed foreground misses to fetch aligned chunks; added regression tests and updated the turn document.","dependency_count":0,"dependent_count":0,"comment_count":0}

Dreamio/ProgressiveHTTPRangeCache.swift

@@ -272,10 +272,6 @@ final class HTTPRangeRemoteFetcher {
         guard !url.path.lowercased().hasSuffix(".m3u8") else {
             return HTTPRangeProbeResult(isCacheable: false, contentLength: nil, fallbackReason: "hls-playlist")
         }
-        guard !Self.shouldBypassCache(for: url) else {
-            return HTTPRangeProbeResult(isCacheable: false, contentLength: nil, fallbackReason: "tail-index-container")
-        }
-
         if let head = try? await response(for: request(method: "HEAD")),
            (200..<400).contains(head.statusCode) {
             let acceptsRanges = header("Accept-Ranges", in: head)?.lowercased().contains("bytes") == true
@@ -334,10 +330,6 @@ final class HTTPRangeRemoteFetcher {
         response.value(forHTTPHeaderField: name)
     }
 
-    private static func shouldBypassCache(for url: URL) -> Bool {
-        let extensionName = url.pathExtension.lowercased()
-        return ["mkv", "mk3d", "mka", "mks", "webm"].contains(extensionName)
-    }
 }
 
 enum HTTPRangeCacheError: Error {

Tests/StreamResolverTests.swift

@@ -43,7 +43,7 @@ struct StreamResolverTests {
         testRangeCacheForegroundMissFetchesAlignedChunks()
         await testRangeCacheForegroundMissReprioritizesPrefetch()
         await testRangeCacheHitFollowsActualPostSeekReadArea()
-        await testRangeProbeBypassesTailIndexContainers()
+        await testRangeProbeAllowsRangeCacheForMKVWhenServerSupportsRanges()
         await testRangeProbeFallsBackWhenServerIgnoresRange()
         await testRangeFetcherPreservesHeaders()
         print("StreamResolverTests passed")
@@ -541,17 +541,21 @@ struct StreamResolverTests {
         try? await Task.sleep(nanoseconds: 50_000_000)
     }
 
-    private static func testRangeProbeBypassesTailIndexContainers() async {
+    private static func testRangeProbeAllowsRangeCacheForMKVWhenServerSupportsRanges() async {
         var requestCount = 0
         MockURLProtocol.handler = { request in
             requestCount += 1
+            assertEqual(request.httpMethod, "HEAD")
             let response = HTTPURLResponse(
                 url: request.url!,
-                statusCode: 206,
+                statusCode: 200,
                 httpVersion: nil,
-                headerFields: ["Content-Range": "bytes 0-0/20"]
+                headerFields: [
+                    "Accept-Ranges": "bytes",
+                    "Content-Length": "20"
+                ]
             )!
-            return (Data([1]), response)
+            return (Data(), response)
         }
 
         let fetcher = HTTPRangeRemoteFetcher(
@@ -561,9 +565,10 @@ struct StreamResolverTests {
         )
         let probe = await fetcher.probe()
 
-        assertEqual(probe.isCacheable, false)
-        assertEqual(probe.fallbackReason, "tail-index-container")
-        assertEqual(requestCount, 0)
+        assertEqual(probe.isCacheable, true)
+        assertEqual(probe.contentLength, 20)
+        assertEqual(probe.fallbackReason, nil)
+        assertEqual(requestCount, 1)
         MockURLProtocol.handler = nil
     }