diff --git a/webif/lib/ts.class b/webif/lib/ts.class
index de18178..b998d93 100644
--- a/webif/lib/ts.class
+++ b/webif/lib/ts.class
@@ -354,14 +354,14 @@ ts method mkbmps {{offset 0}} {
 
 ts method mkbmp {{offset 0} {ext ""}} {
 	set bfile [file rootname $file]
-    set bmpfile "$bfile$ext.bmp"
-    set cmd [list /mod/bin/ffmpeg -loglevel fatal -ss $offset -i $file \
-        -frames 1 -pix_fmt argb -vf vflip -s 140x78 -y $bmpfile]
-    catch { exec {*}$cmd }
-    if {![catch { file stat $bmpfile stbmp }]} {
-            if {[dict get $stbmp size] != 0} { return 1 }
-    }
-    return 0
+	set bmpfile "$bfile$ext.bmp"
+	set cmd [list /mod/bin/ffmpeg -loglevel fatal -ss $offset -i $file \
+	    -frames 1 -pix_fmt argb -vf vflip -s 140x78 -y $bmpfile]
+	catch { exec {*}$cmd }
+	if {![catch { file stat $bmpfile stbmp }]} {
+		if {[dict get $stbmp size] != 0} { return 1 }
+	}
+	return 0
 }
 
 ts method mkthm {{offset 0}} {