Change default transcodings to a proper typed struct

consts/consts.go

@@ -88,24 +88,29 @@ const (
 
 var (
 	DefaultDownsamplingFormat = "opus"
-	DefaultTranscodings       = []map[string]interface{}{
+	DefaultTranscodings       = []struct {
+		Name           string
+		TargetFormat   string
+		DefaultBitRate int
+		Command        string
+	}{
 		{
-			"name":           "mp3 audio",
-			"targetFormat":   "mp3",
-			"defaultBitRate": 192,
-			"command":        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -f mp3 -",
+			Name:           "mp3 audio",
+			TargetFormat:   "mp3",
+			DefaultBitRate: 192,
+			Command:        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -f mp3 -",
 		},
 		{
-			"name":           "opus audio",
-			"targetFormat":   "opus",
-			"defaultBitRate": 128,
-			"command":        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -c:a libopus -f opus -",
+			Name:           "opus audio",
+			TargetFormat:   "opus",
+			DefaultBitRate: 128,
+			Command:        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -c:a libopus -f opus -",
 		},
 		{
-			"name":           "aac audio",
-			"targetFormat":   "aac",
-			"defaultBitRate": 256,
-			"command":        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -c:a aac -f adts -",
+			Name:           "aac audio",
+			TargetFormat:   "aac",
+			DefaultBitRate: 256,
+			Command:        "ffmpeg -i %s -ss %t -map 0:a:0 -b:a %bk -v 0 -c:a aac -f adts -",
 		},
 	}
 

db/migration/20200706231659_add_default_transcodings.go

@@ -30,7 +30,7 @@ func upAddDefaultTranscodings(_ context.Context, tx *sql.Tx) error {
 	}
 
 	for _, t := range consts.DefaultTranscodings {
-		_, err := stmt.Exec(uuid.NewString(), t["name"], t["targetFormat"], t["defaultBitRate"], t["command"])
+		_, err := stmt.Exec(uuid.NewString(), t.Name, t.TargetFormat, t.DefaultBitRate, t.Command)
 		if err != nil {
 			return err
 		}