add ytdlp_file_format config variable (#6)

- allow choosing preferred file format for downloads
- update readme

README.md

@@ -77,9 +77,10 @@ This script requires the following software to be installed on the system
 - `downloader - curl`: The name of the program to use to download the video
 - `font_name - JetBrains Mono`: The name of the font to use
 - `font_size - 12`: Size of the font
-- `marked_icon - ⇅`: The icon to use to mark a video as ready to be moved
-  in the queue
+- `marked_icon - ⇅`: The icon to use to mark a video as ready to be moved in
+  the queue
 - `show_errors - yes`: Show error messages on the OSD
+- `ytdlp_file_format - mp4`: The preferred file format for downloaded videos
 - `ytdlp_output_template - %(uploader)s/%(title)s.%(ext)s`: The [yt-dlp output
   template string](https://github.com/yt-dlp/yt-dlp#output-template)
   - Full path with the default `download_directory`

mpv-youtube-queue.conf

@@ -23,4 +23,5 @@ font_name=JetBrains Mono
 font_size=12
 marked_icon=⇅
 show_errors=yes
+ytdlp_file_format=mp4
 ytdlp_output_template=%(uploader)s/%(title)s.%(ext)s

mpv-youtube-queue.lua

@@ -44,6 +44,7 @@ local options = {
     font_size = 12,
     marked_icon = "⇅",
     show_errors = true,
+    ytdlp_file_format = "mp4",
     ytdlp_output_template = "%(uploader)s/%(title)s.%(ext)s"
 }
 
@@ -462,7 +463,9 @@ function YouTubeQueue.download_video_at(idx)
     local v = video_queue[idx]
     local q = o.download_quality:sub(1, -2)
     local dl_dir = expanduser(o.download_directory)
-    local command = 'yt-dlp -f \'bestvideo[height<=' .. q ..
+    local command = 'yt-dlp -f \'bestvideo[height<=' .. q .. '][ext=' ..
+        options.ytdlp_file_format .. ']+bestaudio/best[height<=' ..
+        q .. ']/bestvideo[height<=' .. q ..
         ']+bestaudio/best[height<=' .. q .. ']\' -o "' .. dl_dir ..
         "/" .. options.ytdlp_output_template ..
         '" --downloader ' .. o.downloader .. ' ' .. v.video_url