diff --git a/src/invidious/routes/api/manifest.cr b/src/invidious/routes/api/manifest.cr
index 78b4906d..6c4225e5 100644
--- a/src/invidious/routes/api/manifest.cr
+++ b/src/invidious/routes/api/manifest.cr
@@ -27,28 +27,21 @@ module Invidious::Routes::API::Manifest
         haltf env, status_code: response.status_code
       end
 
-      manifest = response.body
-
-      manifest = manifest.gsub(/<BaseURL>[^<]+<\/BaseURL>/) do |baseurl|
-        url = baseurl.lchop("<BaseURL>")
-        url = url.rchop("</BaseURL>")
-
-        if local
-          uri = URI.parse(url)
-          url = "#{HOST_URL}#{uri.request_target}host/#{uri.host}/"
-        end
-
+      # Proxy URLs for video playback on invidious.
+      # Other API clients can get the original URLs by omiting `local=true`.
+      manifest = response.body.gsub(/<BaseURL>[^<]+<\/BaseURL>/) do |baseurl|
+        url = baseurl.lchop("<BaseURL>").rchop("</BaseURL>")
+        url = HttpServer::Utils.proxy_video_url(url, absolute: true) if local
         "<BaseURL>#{url}</BaseURL>"
       end
 
       return manifest
     end
 
-    adaptive_fmts = video.adaptive_fmts
-
+    # Ditto, only proxify URLs if `local=true` is used
     if local
-      adaptive_fmts.each do |fmt|
-        fmt["url"] = JSON::Any.new("#{HOST_URL}#{URI.parse(fmt["url"].as_s).request_target}")
+      video.adaptive_fmts.each do |fmt|
+        fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s, absolute: true))
       end
     end
 
@@ -183,8 +176,9 @@ module Invidious::Routes::API::Manifest
     manifest = response.body
 
     if local
-      manifest = manifest.gsub(/^https:\/\/\w+---.{11}\.c\.youtube\.com[^\n]*/m) do |match|
-        path = URI.parse(match).path
+      manifest = manifest.gsub(/https:\/\/[^\n"]*/m) do |match|
+        uri = URI.parse(match)
+        path = uri.path
 
         path = path.lchop("/videoplayback/")
         path = path.rchop("/")
@@ -213,7 +207,7 @@ module Invidious::Routes::API::Manifest
           raw_params["fvip"] = fvip["fvip"]
         end
 
-        raw_params["local"] = "true"
+        raw_params["host"] = uri.host.not_nil!
 
         "#{HOST_URL}/videoplayback?#{raw_params}"
       end
diff --git a/src/invidious/routes/embed.cr b/src/invidious/routes/embed.cr
index 266f7ba4..00f24159 100644
--- a/src/invidious/routes/embed.cr
+++ b/src/invidious/routes/embed.cr
@@ -157,10 +157,12 @@ module Invidious::Routes::Embed
     adaptive_fmts = video.adaptive_fmts
 
     if params.local
-      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
-      adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
+      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
     end
 
+    # Always proxy DASH streams, otherwise youtube CORS headers will prevent playback
+    adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
+
     video_streams = video.video_streams
     audio_streams = video.audio_streams
 
diff --git a/src/invidious/routes/video_playback.cr b/src/invidious/routes/video_playback.cr
index 26852d06..a8f9f665 100644
--- a/src/invidious/routes/video_playback.cr
+++ b/src/invidious/routes/video_playback.cr
@@ -164,10 +164,13 @@ module Invidious::Routes::VideoPlayback
               env.response.headers["Access-Control-Allow-Origin"] = "*"
 
               if location = resp.headers["Location"]?
-                location = URI.parse(location)
-                location = "#{location.request_target}&host=#{location.host}#{region ? "&region=#{region}" : ""}"
+                url = Invidious::HttpServer::Utils.proxy_video_url(location, region: region)
 
-                env.redirect location
+                if title = query_params["title"]?
+                  url = "#{url}&title=#{URI.encode_www_form(title)}"
+                end
+
+                env.redirect url
                 break
               end
 
diff --git a/src/invidious/routes/watch.cr b/src/invidious/routes/watch.cr
index 27b96730..1f384546 100644
--- a/src/invidious/routes/watch.cr
+++ b/src/invidious/routes/watch.cr
@@ -121,10 +121,12 @@ module Invidious::Routes::Watch
     adaptive_fmts = video.adaptive_fmts
 
     if params.local
-      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
-      adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(URI.parse(fmt["url"].as_s).request_target) }
+      fmt_stream.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
     end
 
+    # Always proxy DASH streams, otherwise youtube CORS headers will prevent playback
+    adaptive_fmts.each { |fmt| fmt["url"] = JSON::Any.new(HttpServer::Utils.proxy_video_url(fmt["url"].as_s)) }
+
     video_streams = video.video_streams
     audio_streams = video.audio_streams