diff --git a/server/server.js b/server/server.js
index 962a895..743a6dd 100644
--- a/server/server.js
+++ b/server/server.js
@@ -347,6 +347,12 @@ async function resolveStreams(videoId) {
   let soonest = Infinity;
   for (const f of raw) {
     if (!f.url) continue;
+    // Only keep direct https byte streams. Newer yt-dlp also surfaces HLS
+    // (m3u8/m3u8_native) and DASH-segment formats whose `url` is a manifest,
+    // not media bytes — proxying those hands the <video> element an m3u8 it
+    // can't play (Chrome) and defeats Range seeking (416). https formats are
+    // exactly the ones the dual-stream engine relied on before this change.
+    if (f.protocol && f.protocol !== 'https') continue;
     const exp = parseExpiry(f.url);
     if (exp) soonest = Math.min(soonest, exp);
     formats.push({
@@ -392,7 +398,7 @@ function pickFormat(formats, { formatId, wantAudio, wantHeight }) {
   }
   if (wantAudio) return pickBestAudio(formats);
   if (wantHeight) {
-    for (const wantProg of [true, false]) {
+    for (const wantProg of [false, true]) {
       for (const f of formats) {
         if (!isVideoFmt(f)) continue;
         if (isAudioFmt(f) !== wantProg) continue;
@@ -417,12 +423,15 @@ app.get('/api/streams', async (c) => {
       ? `/api/play?v=${videoId}&audio=1&f=${encodeURIComponent(bestAudio.formatId)}`
       : null;
 
-    // Quality list — progressive (single-file) first, then adaptive; one entry
-    // per height. Each URL points at our proxy, carrying the format id so the
-    // proxy serves the exact same stream this list advertised.
+    // Quality list — one entry per height. ADAPTIVE (video-only, paired with
+    // the separate audioUrl for dual-stream playback) is preferred over
+    // progressive single-file: adaptive https streams proxy reliably, while
+    // progressive muxed formats (itag 18 and friends) are increasingly
+    // SABR-gated and flaky. Progressive is kept only when no adaptive stream
+    // exists at that height.
     const qualities = [];
     const seen = new Set();
-    for (const wantProg of [true, false]) {
+    for (const wantProg of [false, true]) {
       for (const f of formats) {
         if (!isVideoFmt(f)) continue;
         if (isAudioFmt(f) !== wantProg) continue;