https://bugs.gentoo.org/899956
https://github.com/mpv-player/mpv/pull/11398

From 985655ebfd77ceddc44d76f8cc6dc446002f34ee Mon Sep 17 00:00:00 2001
From: Christoph Heinrich <christoph.heinrich@student.tugraz.at>
Date: Fri, 3 Mar 2023 00:45:45 +0100
Subject: [PATCH 1/2] ytdl_hook: init fragment requires other fragments

With dash the first fragment was always considered an init fragment if
there wasn't a duration. However that only makes sense when there are
also other fragments, so check if there are other fragments in addition
to the lack of a duration.
--- a/player/lua/ytdl_hook.lua
+++ b/player/lua/ytdl_hook.lua
@@ -297,7 +297,7 @@ local function edl_track_joined(fragments, protocol, is_live, base)
         local args = ""
 
         -- assume MP4 DASH initialization segment
-        if not fragments[1].duration then
+        if not fragments[1].duration and #fragments > 1 then
             msg.debug("Using init segment")
             args = args .. ",init=" .. edl_escape(join_url(base, fragments[1]))
             offset = 2

From a5961ad096b1361a12f836c8b170fc748f46962a Mon Sep 17 00:00:00 2001
From: Christoph Heinrich <christoph.heinrich@student.tugraz.at>
Date: Fri, 3 Mar 2023 00:50:58 +0100
Subject: [PATCH 2/2] ytdl_hook: only log error when no fallback url available

An error indicates that something doesn't work, but as long as a
safe url is available, playback is still expected to work.

Thus reduce logging level of MP4 DASH without fragments message and
add a new error message for when there is no safe url available either.

Also adds a missing space.
--- a/player/lua/ytdl_hook.lua
+++ b/player/lua/ytdl_hook.lua
@@ -309,7 +309,7 @@ local function edl_track_joined(fragments, protocol, is_live, base)
         -- if not available in all, give up.
         for i = offset, #fragments do
             if not fragments[i].duration then
-                msg.error("EDL doesn't support fragments" ..
+                msg.verbose("EDL doesn't support fragments " ..
                          "without duration with MP4 DASH")
                 return nil
             end
@@ -423,6 +423,7 @@ local function formats_to_edl(json, formats, use_all_formats)
             track.protocol, json.is_live,
             track.fragment_base_url)
         if not edl_track and not url_is_safe(track.url) then
+            msg.error("No safe URL or supported fragmented stream available")
             return nil
         end