Linux versino and Gif output

main.go

@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"runtime"
 	"syscall"
 	"time"
 )
@@ -35,7 +36,11 @@ func main() {
 	if !app.tools.OK() {
 		fmt.Println("WARNING: ffmpeg/ffprobe not found.")
 		fmt.Println("  Put ffmpeg" + exeSuffix + " and ffprobe" + exeSuffix + " in the same folder as this program")
-		fmt.Println("  (or on your PATH). Windows builds: https://www.gyan.dev/ffmpeg/builds/")
+		if runtime.GOOS == "windows" {
+			fmt.Println("  (or on your PATH). Windows builds: https://www.gyan.dev/ffmpeg/builds/")
+		} else {
+			fmt.Println("  (or on your PATH, e.g. by installing your distribution's ffmpeg package).")
+		}
 		fmt.Println()
 	} else {
 		fmt.Printf("ffmpeg:  %s\nffprobe: %s\n\n", app.tools.FFmpeg, app.tools.FFprobe)
@@ -69,7 +74,7 @@ func main() {
 	}
 
 	sig := make(chan os.Signal, 1)
-	signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
+	signal.Notify(sig, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
 	go func() {
 		<-sig
 		app.requestQuit("interrupted")