revid: move command creation and logging out of switch

revid/revid.go

@@ -31,6 +31,7 @@ package revid
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"os"
 	"os/exec"
@@ -413,9 +414,14 @@ func (r *Revid) outputClips() {
 // a raspivid process and pipes it's data output.
 func (r *Revid) startRaspivid() error {
 	r.config.Logger.Log(smartlogger.Info, pkg+"starting raspivid")
+
+	var args []string
 	switch r.config.InputCodec {
+	default:
+		return fmt.Errorf("revid: invalid input codec: %v", r.config.InputCodec)
+
 	case H264:
-		args := []string{
+		args = []string{
 			"-cd", "H264",
 			"-o", "-",
 			"-n",
@@ -427,7 +433,6 @@ func (r *Revid) startRaspivid() error {
 			"-ih",
 			"-g", r.config.IntraRefreshPeriod,
 		}
-
 		if r.config.QuantizationMode == QuantizationOn {
 			args = append(args, "-qp", r.config.Quantization)
 		}
@@ -437,19 +442,19 @@ func (r *Revid) startRaspivid() error {
 		if r.config.VerticalFlip == Yes {
 			args = append(args, "-vf")
 		}
-		r.config.Logger.Log(smartlogger.Info, pkg+"raspivid args", "raspividArgs", strings.Join(args, " "))
-		r.cmd = exec.Command("raspivid", args...)
 
 	case Mjpeg:
-		// FIXME(saxon): do above in this case too
-		r.cmd = exec.Command("raspivid",
+		args = []string{
 			"-cd", "MJPEG",
 			"-o", "-",
 			"-n",
 			"-t", runContinuously,
 			"-fps", r.config.FrameRate,
-		)
+		}
 	}
+	r.config.Logger.Log(smartlogger.Info, pkg+"raspivid args", "raspividArgs", strings.Join(args, " "))
+	r.cmd = exec.Command("raspivid", args...)
+
 	d, err := strconv.Atoi(r.config.FrameRate)
 	if err != nil {
 		return err