diff --git a/video.lua b/video.lua
index d2c0774..597ade4 100644
--- a/video.lua
+++ b/video.lua
@@ -33,11 +33,11 @@ while args[1] ~= nil and string.sub(args[1], 1, 1) == "-" do
   elseif k == "J" or k == "info-json" then
     local req = assert(http.get(table.remove(args, 1)))
     local info = textutils.unserializeJSON(req.readAll())
-    delay = info.frametime
+    delay = info.frame_time
     n_frames = info.frame_count
     video_url = info.video
     audio_url_l = info.audio.l
-    audio_url_l = info.audio.r
+    audio_url_r = info.audio.r
     req.close()
   end
 end
@@ -52,14 +52,16 @@ if not speakers.l then
   return
 end
 
-if #args < 3 and not n_frames and not video_url and not audio_url_l then
-  printError("Usage: video [-w] [-b BUFSZ] [-t THREADS] [-J URL] [-m MONITOR] [-l SPK_L] [-r SPK_R] [-d FRAME_T] <N_FRAMES> <VIDEO_TEMPLATE> <LEFT_CHANNEL> [RIGHT_CHANNEL]")
-  return
-else
-  n_frames = tonumber(table.remove(args, 1))
-  video_url = table.remove(args, 1)
-  audio_url_l = table.remove(args, 1)
-  audio_url_r = #args > 0 and table.remove(args, 1) or nil
+if not n_frames and not video_url and not audio_url_l then
+  if #args < 3 then
+    printError("Usage: video [-w] [-b BUFSZ] [-t THREADS] [-J URL] [-m MONITOR] [-l SPK_L] [-r SPK_R] [-d FRAME_T] <N_FRAMES> <VIDEO_TEMPLATE> <LEFT_CHANNEL> [RIGHT_CHANNEL]")
+    return
+  else
+    n_frames = tonumber(table.remove(args, 1))
+    video_url = table.remove(args, 1)
+    audio_url_l = table.remove(args, 1)
+    audio_url_r = #args > 0 and table.remove(args, 1) or nil
+  end
 end
 
 print(string.format("Using monitor %s", peripheral.getName(monitor)))