Add pix_fmt argument to ffmpeg decoder

decoder/ffmpeg/ffmpeg.go

@@ -22,21 +22,34 @@ func NewDecoder(r io.Reader, settings map[string]any) (d *Decoder, err error) {
 		return nil, err
 	}
 
+	pixelFormat := utilities.GetSettingString(settings, "pix_fmt", "")
+
 	ffmpegBinary := "ffmpeg"
 	if p := os.Getenv("FFMPEG_PATH"); p != "" {
 		ffmpegBinary = p
 	}
 
-	cmd := exec.Command(ffmpegBinary,
-		//"-v", "quiet",
+	args := []string{
+		"-v", "quiet",
 		"-probesize", "8192",
 		"-strict", "experimental",
 		"-i", "pipe:",
 		"-map_metadata", "-1",
 		"-map", fmt.Sprintf("0:v:%d", videoIndex),
+	}
+
+	if pixelFormat != "" {
+		args = append(args, "-pix_fmt:v", pixelFormat)
+	}
+
+	args = append(args, []string{
 		"-f", "yuv4mpegpipe",
 		"-strict", "experimental",
 		"pipe:",
+	}...)
+
+	cmd := exec.Command(ffmpegBinary,
+		args...,
 	)
 
 	cmdIn, err := cmd.StdinPipe()