refactor config default handling

internal/manager/config/config.go

@@ -84,7 +84,7 @@ const (
 	parallelTasksDefault = 1
 
 	SpriteInterval        = "sprite_interval"
-	SpriteIntervalDefault = 0
+	SpriteIntervalDefault = 30
 
 	MinimumSprites        = "minimum_sprites"
 	MinimumSpritesDefault = 10
@@ -982,12 +982,20 @@ func (i *Config) GetParallelTasksWithAutoDetection() int {
 
 // GetSpriteInterval returns the time to be between each scrubber sprite
 func (i *Config) GetSpriteInterval() int {
-	return i.getInt(SpriteInterval)
+	value := i.getInt(SpriteInterval)
+	if value <= 0 {
+		return SpriteIntervalDefault
+	}
+	return value
 }
 
 // GetMinimumSprites return the minimum number of sprites that have to be generated
 func (i *Config) GetMinimumSprites() int {
-	return i.getInt(MinimumSprites)
+	value := i.getInt(MinimumSprites)
+	if value <= 0 {
+		return MinimumSpritesDefault
+	}
+	return value
 }
 
 func (i *Config) GetPreviewAudio() bool {

internal/manager/generator_sprite.go

@@ -16,10 +16,6 @@ import (
 	"github.com/stashapp/stash/pkg/scene/generate"
 )
 
-const (
-	DefaultSpriteInterval = 30
-)
-
 type SpriteGenerator struct {
 	Info *generatorInfo
 
@@ -41,13 +37,11 @@ func NewSpriteGenerator(videoFile ffmpeg.VideoFile, videoChecksum string, imageO
 	}
 	slowSeek := false
 
-	spriteInterval := DefaultSpriteInterval
 	config := config.GetInstance()
-	if config.GetSpriteInterval() != 0 {
-		spriteInterval = config.GetSpriteInterval()
-	}
 
+	spriteInterval := config.GetSpriteInterval()
 	minimumSpriteCount := config.GetMinimumSprites()
+
 	spriteCount := int64(math.Ceil(videoFile.VideoStreamDuration / float64(spriteInterval)))
 
 	// For files with small duration / low frame count  try to seek using frame number intead of seconds