ytdl_hook, edl: implement pseudo-DASH support

We use the metadata provided by youtube-dl to sort-of implement
fragmented DASH streaming.

This is all a bit hacky, but hopefully a makeshift solution until
libavformat has proper mechanisms. (Although in danger of being one
of those temporary hacks that become permanent.)

1 files changed, 9 insertions, 3 deletions

diff --git a/player/lua/ytdl_hook.lua b/player/lua/ytdl_hook.lua
index 7349e579e3..fba5100822 100644
--- a/player/lua/ytdl_hook.lua
+++ b/player/lua/ytdl_hook.lua
@@ -90,11 +90,17 @@ end
 
 local function edl_track_joined(fragments)
     local edl = "edl://"
-    for i = 1, #fragments do
+    local offset = 1
+    if fragments[1] and not fragments[1].duration then
+        -- if no duration, probably initialization segment
+        edl = edl .. "!mp4_dash,init=" .. edl_escape(fragments[1].url)
+        offset = 2
+    end
+    for i = offset, #fragments do
         local fragment = fragments[i]
-        edl = edl .. edl_escape(fragment.url)
         if fragment.duration then
-            edl = edl .. ",length=" .. fragment.duration
+            edl = edl .. edl_escape(fragment.url)
+            edl = edl..",length="..fragment.duration
         end
         edl = edl .. ";"
     end