@@ -7,17 +7,13 @@
 https://github.com/birabittoh/FixYouTube-legacy/assets/26506860/e1ad5397-41c8-4073-9b3e-598c66241255
 
 ### Advanced usage
-Some services require video previews to be smaller than a certain file size. This app gets the best-looking format by default, so it's not uncommon to have previews that are too big, thus being ignored by crawlers.
+Some services require video previews to be smaller than a certain file size. By default, this app selects the best-looking format that fits these criteria.
 
 Enter the `/{videoID}/{formatID}` endpoint.
 
-You can change `formatID` to cycle through the available formats for a given video. These formats are also filtered based on file size, in a way that makes them viable Telegram previews.
-
-In short, if `/{videoID}` does not generate a preview, you can try `/{videoID}/1`, which should be the best-looking format within Telegram's filesize bounds.
-
-The next values of `formatID` (2 to infinity) are even smaller formats within those bounds.
+The default value of  `formatID` is `1`, but you can increase it to cycle through the available formats for a given video or set it to `0` to select the best-looking format and ignore file size bounds altogether.
 
-If the video is too long, there might not be small enough formats. In that case, the app returns error 500.
+If the video is too long, there might not be small enough formats. In that case, the app effectively behaves like `formatID` is set to `0`.
 
 ## Instructions
 
@@ -30,8 +26,8 @@ ### Docker with reverse proxy
 Copy the template config file and make your adjustments. My configuration is based on [DuckDNS](http://duckdns.org/) but you can use whatever provider you find [here](https://docs.linuxserver.io/general/swag#docker-compose).
 
 ```
-cp docker/swag.env.example docker/swag.env
-nano docker/swag.env
+cp swag/swag.env.example swag/swag.env
+nano swag/swag.env
 ```
 
 Finally: `docker compose up -d`.

@@ -12,10 +12,10 @@ container_name: swag
     cap_add:
         - NET_ADMIN
     env_file:
-      - docker/swag.env
+      - swag/swag.env
     volumes:
         #- /etc/config/swag:/config
-        - ./docker/gopipe.subdomain.conf:/config/nginx/proxy-confs/gopipe.subdomain.conf:ro
+        - ./swag/gopipe.subdomain.conf:/config/nginx/proxy-confs/gopipe.subdomain.conf:ro
     ports:
         - 443:443
         - 80:80

@@ -21,7 +21,7 @@
 func getFormatID(s string) int {
 	formatID, err := strconv.ParseUint(s, 10, 64)
 	if err != nil {
-		formatID = 0
+		formatID = 1
 	}
 	return int(formatID)
 }

@@ -35,18 +35,20 @@ return time.Until(time.Unix(expireTimestamp, 0))
 }
 
 func getFormat(video youtube.Video, formatID int) *youtube.Format {
-	selectFn := formatsSelectFn
-	if formatID == 0 {
-		selectFn = formatsSelectFnBest
-		formatID = 1
+	if formatID != 0 {
+		f := video.Formats.Select(formatsSelectFn)
+		l := len(f)
+		if l > 0 {
+			return &f[(formatID-1)%l]
+		}
 	}
 
-	f := video.Formats.Select(selectFn)
-	l := len(f)
-	if l == 0 {
-		return nil
+	f := video.Formats.Select(formatsSelectFnBest)
+	if len(f) > 0 {
+		return &f[0]
 	}
-	return &f[(formatID-1)%l]
+
+	return nil
 }
 
 func formatsSelectFn(f youtube.Format) bool {