ytdl_hook: add script option to revert to trying youtube-dl first

Should only make a difference if most of the URLs you open need
youtube-dl parsing.

DOCS/man/options.rst

@@ -552,6 +552,11 @@ Program Behavior
 
     If the script can't do anything with an URL, it will do nothing.
 
+    The `try_ytdl_first` script option accepts a boolean 'yes' or 'no', and if
+    'yes' will try parsing the URL with youtube-dl first, instead of the default
+    where it's only after mpv failed to open it. This mostly depends on whether
+    most of your URLs need youtube-dl parsing.
+
     The `exclude` script option accepts a ``|``-separated list of URL patterns
     which mpv should not use with youtube-dl. The patterns are matched after
     the ``http(s)://`` part of the URL.

player/lua/ytdl_hook.lua

@@ -3,7 +3,8 @@ local msg = require 'mp.msg'
 local options = require 'mp.options'
 
 local o = {
-    exclude = ""
+    exclude = "",
+    try_ytdl_first = false
 }
 options.read_options(o)
 
@@ -301,7 +302,7 @@ local function add_single_video(json)
     end
 end
 
-mp.add_hook("on_load_fail", 10, function ()
+mp.add_hook(try_ytdl_first and "on_load" or "on_load_fail", 10, function ()
     local url = mp.get_property("stream-open-filename")
     local start_time = os.clock()
     if (url:find("ytdl://") == 1) or