From 77eea010a6830b69ceb00a3a8622a0f74ab5906f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 19 Apr 2026 09:31:33 +0000
Subject: [PATCH] Tidy DASH fallback and error matching per validation feedback

Agent-Logs-Url: https://github.com/19JVJeffery/tiddl-gui/sessions/5e0218fc-7235-4e8b-8e82-52759274b754

Co-authored-by: 19JVJeffery <94115228+19JVJeffery@users.noreply.github.com>
---
 web/js/download.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/web/js/download.js b/web/js/download.js
index f5f61ca..81f5d48 100644
--- a/web/js/download.js
+++ b/web/js/download.js
@@ -45,7 +45,7 @@ function parseDashManifest(manifest) {
   const segTpl = pick("SegmentTemplate");
   const urlTemplate = segTpl?.getAttribute("media") || "";
   const initTemplate = segTpl?.getAttribute("initialization") || "";
-  const startNumber = Math.max(parseInt(segTpl?.getAttribute("startNumber") || "1", 10) || 1, 1);
+  const startNumber = parseInt(segTpl?.getAttribute("startNumber") || "1", 10) || 1;
 
   const timeline = doc.getElementsByTagNameNS(NS, "S").length
     ? [...doc.getElementsByTagNameNS(NS, "S")]
@@ -56,6 +56,7 @@ function parseDashManifest(manifest) {
     const r = el.getAttribute("r");
     if (r) segmentCount += parseInt(r, 10);
   }
+  // Some manifests omit SegmentTimeline; fall back to one media segment.
   if (!segmentCount) segmentCount = 1;
 
   const baseUrl = (pick("BaseURL")?.textContent || "").trim();
@@ -983,7 +984,7 @@ function shouldTryQualityFallback(err) {
   const msg = String(err?.message || "").toLowerCase();
   if (!msg) return false;
   if (msg.includes("not authenticated")) return false;
-  return /403|404|quality|not available|not found|unsupported|forbidden/.test(msg);
+  return /403|404|quality|not available|not found|unsupported/.test(msg);
 }
 
 async function getTrackStreamWithFallback(trackId, requestedQuality, onProgress) {