options: enable --ytdl by default

Let's see who complains...

DOCS/man/changes.rst

@@ -113,8 +113,8 @@ Miscellaneous
 * Matroska edition switching at runtime.
 * Support for playing URLs of popular streaming sites directly.
   (e.g. ``mpv https://www.youtube.com/watch?v=...``).
-  Requires a recent version of ``youtube-dl`` to be installed, and
-  ``ytdl=yes`` in the mpv config file.
+  Requires a recent version of ``youtube-dl`` to be installed. Can be
+  disabled with ``ytdl=no`` in the mpv config file.
 * Support for precise scrolling which scales the parameter of commands. If the
   input doesn't support precise scrolling the scale factor stays 1.
 * Allow changing/adjusting video filters at runtime. (This is also used to make

DOCS/man/options.rst

@@ -429,13 +429,10 @@ Program Behavior
     Enable the youtube-dl hook-script. It will look at the input URL, and will
     play the video located on the website. This works with many streaming sites,
     not just the one the scripts are named after. This requires a recent version
-    of youtube-dl to be installed on the system.
+    of youtube-dl to be installed on the system. (Enabled by default.)
 
     If the script can't do anything with an URL, it will do nothing.
 
-    Currently disabled by default, because youtube-dl's generic extractor can
-    get stuck on some URL, preventing playback.
-
     (Note: this is the replacement for the now removed libquvi support.)
 
 ``--ytdl-format=<best|worst|mp4|webm|...>``

options/options.c

@@ -620,7 +620,7 @@ const struct MPOpts mp_default_opts = {
     .use_text_osd = 1,
 #if HAVE_LUA
     .lua_load_osc = 1,
-    .lua_load_ytdl = 0,
+    .lua_load_ytdl = 1,
     .lua_ytdl_format = NULL,
 #endif
     .auto_load_scripts = 1,