[README.md] Add a format selection example using comma

Ref: #10399

diff --git a/README.md b/README.md
index 952db7abb8aff25473544d9827ef7b9b3060cc8d..a10aaf35c6733ae308c2309539110304ba25049f 100644 (file)
--- a/README.md
+++ b/README.md
@@ -645,7 +645,11 @@ $ youtube-dl -f 'best[filesize<50M]'
 
 # Download best format available via direct link over HTTP/HTTPS protocol
 $ youtube-dl -f '(bestvideo+bestaudio/best)[protocol^=http]'
+
+# Download the best video format and the best audio format without merging them
+$ youtube-dl -f 'bestvideo,bestaudio' -o '%(title)s.f%(format_id)s.%(ext)s'
 ```
+Note that in the last example, an output template is recommended as bestvideo and bestaudio may have the same file name.
 
 
 # VIDEO SELECTION