✨ Add CRF argument

Author: zackradisic

args.go

@@ -30,6 +30,7 @@ type outputArgs struct {
 	audioChannels         int
 	keyframeInterval      int
 	audioCodec            string
+	constantRateFactor    int
 	videoBitRate          int
 	videoBitRateTolerance int
 	videoMaxBitrate       int

command.go

@@ -25,7 +25,11 @@ func NewCommand(ffmpegPath string) *Command {
 	}
 	return &Command{
 		FFmpegPath: ffmpegPath,
-		Args:       &Args{},
+		Args: &Args{
+			output: outputArgs{
+				constantRateFactor: -1, // Initialize to -1 because zero value is a valid parameter
+			},
+		},
 	}
 }
 

output_getters.go

@@ -22,6 +22,15 @@ func (a *Args) GetAspectRatio() []string {
 	return nil
 }
 
+// GetConstantRateFactor gets the constant rate factor (CRF) for video encoding
+func (a *Args) GetConstantRateFactor() []string {
+	if a.output.constantRateFactor != -1 {
+		return []string{"-crf", fmt.Sprintf("%d", a.output.constantRateFactor)}
+	}
+
+	return nil
+}
+
 // GetVideoBitRate returns returns the arguments for video bit rate
 func (a *Args) GetVideoBitRate() []string {
 	if a.output.videoBitRate != 0 {

output_setters.go

@@ -17,6 +17,13 @@ func (c *Command) Resolution(v string) *Command {
 	return c
 }
 
+// ConstantRateFactor sets the constant rate factor (CRF) for video encoding
+func (c *Command) ConstantRateFactor(v int) *Command {
+	c.Args.output.constantRateFactor = v
+
+	return c
+}
+
 // VideoBitRate gets the video bit rate.
 func (c *Command) VideoBitRate(v int) *Command {
 	c.Args.output.videoBitRate = v