[Bugfix] prevent duplicate videos from being downloaded if the video's name changes (#396)

* Added methods for deleting outdated files

* Hooked up outdated file deletion to media download worker

test/support/files/subtitle.srt

@@ -0,0 +1,36 @@
+1
+00:00:00,000 --> 00:00:02,500
+Welcome to the Example Subtitle File!
+
+2
+00:00:03,000 --> 00:00:06,000
+This is a demonstration of SRT subtitles.
+
+3
+00:00:07,000 --> 00:00:10,500
+You can use SRT files to add subtitles to your videos.
+
+4
+00:00:12,000 --> 00:00:15,000
+Each subtitle entry consists of a number, a timecode,
+and the subtitle text.
+
+5
+00:00:16,000 --> 00:00:20,000
+The timecode format is hours:minutes:seconds,milliseconds.
+
+6
+00:00:21,000 --> 00:00:25,000
+You can adjust the timing to match your video.
+
+7
+00:00:26,000 --> 00:00:30,000
+Make sure the subtitle text is clear and readable.
+
+8
+00:00:31,000 --> 00:00:35,000
+And that's how you create an SRT subtitle file!
+
+9
+00:00:36,000 --> 00:00:40,000
+Enjoy adding subtitles to your videos!

test/support/fixtures/media_fixtures.ex

@@ -73,16 +73,19 @@ defmodule Pinchflat.MediaFixtures do
         "#{:rand.uniform(1_000_000)}"
       ])
 
-    stored_media_filepath = Path.join(base_dir, "#media.mp4")
+    stored_media_filepath = Path.join(base_dir, "media.mp4")
     thumbnail_filepath = Path.join(base_dir, "thumbnail.jpg")
+    subtitle_filepath = Path.join(base_dir, "subtitle.en.srt")
 
     FilesystemUtils.cp_p!(media_filepath_fixture(), stored_media_filepath)
     FilesystemUtils.cp_p!(thumbnail_filepath_fixture(), thumbnail_filepath)
+    FilesystemUtils.cp_p!(subtitle_filepath_fixture(), subtitle_filepath)
 
     merged_attrs =
       Map.merge(attrs, %{
         media_filepath: stored_media_filepath,
-        thumbnail_filepath: thumbnail_filepath
+        thumbnail_filepath: thumbnail_filepath,
+        subtitle_filepaths: [["en", subtitle_filepath]]
       })
 
     media_item_fixture(merged_attrs)
@@ -124,6 +127,16 @@ defmodule Pinchflat.MediaFixtures do
     ])
   end
 
+  def subtitle_filepath_fixture do
+    Path.join([
+      File.cwd!(),
+      "test",
+      "support",
+      "files",
+      "subtitle.srt"
+    ])
+  end
+
   def infojson_filepath_fixture do
     Path.join([
       File.cwd!(),