Use VA-API hardware scaling

core/transcoder/codecs.go

@@ -16,6 +16,7 @@ type Codec interface {
 	DisplayName() string
 	GlobalFlags() string
 	PixelFormat() string
+	Scaler() string
 	ExtraArguments() string
 	ExtraFilters() string
 	VariantFlags(v *HLSVariant) string
@@ -53,6 +54,11 @@ func (c *Libx264Codec) PixelFormat() string {
 	return "yuv420p" //nolint:goconst
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *Libx264Codec) Scaler() string {
+	return ""
+}
+
 // ExtraArguments are the extra arguments used with this codec in the transcoder.
 func (c *Libx264Codec) ExtraArguments() string {
 	return strings.Join([]string{
@@ -117,6 +123,11 @@ func (c *OmxCodec) PixelFormat() string {
 	return "yuv420p"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *OmxCodec) Scaler() string {
+	return ""
+}
+
 // ExtraArguments are the extra arguments used with this codec in the transcoder.
 func (c *OmxCodec) ExtraArguments() string {
 	return strings.Join([]string{
@@ -183,6 +194,11 @@ func (c *VaapiCodec) PixelFormat() string {
 	return "vaapi_vld"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *VaapiCodec) Scaler() string {
+	return "scale_vaapi"
+}
+
 // ExtraFilters are the extra filters required for this codec in the transcoder.
 func (c *VaapiCodec) ExtraFilters() string {
 	return ""
@@ -245,6 +261,11 @@ func (c *NvencCodec) PixelFormat() string {
 	return "yuv420p"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *NvencCodec) Scaler() string {
+	return ""
+}
+
 // ExtraArguments are the extra arguments used with this codec in the transcoder.
 func (c *NvencCodec) ExtraArguments() string {
 	return ""
@@ -304,6 +325,11 @@ func (c *QuicksyncCodec) PixelFormat() string {
 	return "nv12"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *QuicksyncCodec) Scaler() string {
+	return ""
+}
+
 // ExtraArguments are the extra arguments used with this codec in the transcoder.
 func (c *QuicksyncCodec) ExtraArguments() string {
 	return ""
@@ -362,6 +388,11 @@ func (c *Video4Linux) PixelFormat() string {
 	return "nv21"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *Video4Linux) Scaler() string {
+	return ""
+}
+
 // ExtraArguments are the extra arguments used with this codec in the transcoder.
 func (c *Video4Linux) ExtraArguments() string {
 	return ""
@@ -421,6 +452,11 @@ func (c *VideoToolboxCodec) PixelFormat() string {
 	return "nv12"
 }
 
+// Scaler is the scaler used for resizing the video in the transcoder.
+func (c *VideoToolboxCodec) Scaler() string {
+	return ""
+}
+
 // ExtraFilters are the extra filters required for this codec in the transcoder.
 func (c *VideoToolboxCodec) ExtraFilters() string {
 	return ""

core/transcoder/transcoder.go

@@ -300,7 +300,7 @@ func (v *HLSVariant) getVariantString(t *Transcoder) string {
 	if (v.videoSize.Width != 0 || v.videoSize.Height != 0) && !v.isVideoPassthrough {
 		// Order here matters, you must scale before changing hardware formats
 		filters := []string{
-			v.getScalingString(),
+			v.getScalingString(t.codec.Scaler()),
 		}
 		if t.codec.ExtraFilters() != "" {
 			filters = append(filters, t.codec.ExtraFilters())
@@ -351,8 +351,11 @@ func (v *HLSVariant) SetVideoScalingHeight(height int) {
 	v.videoSize.Height = height
 }
 
-func (v *HLSVariant) getScalingString() string {
-	return fmt.Sprintf("scale=%s", v.videoSize.getString())
+func (v *HLSVariant) getScalingString(scaler string) string {
+	if scaler == "" {
+		scaler = "scale"
+	}
+	return fmt.Sprintf("%s=%s", scaler, v.videoSize.getString())
 }
 
 // Video Quality