diff --git a/lib/src/ffmpeg/filters/scale_filter.dart b/lib/src/ffmpeg/filters/scale_filter.dart
index 56a9414..52401ba 100644
--- a/lib/src/ffmpeg/filters/scale_filter.dart
+++ b/lib/src/ffmpeg/filters/scale_filter.dart
@@ -14,9 +14,7 @@ class ScaleFilter implements Filter {
     this.param0,
     this.param1,
     this.size,
-  })  : assert(width == null || width >= -1),
-        assert(height == null || height >= -1),
-        assert(eval == null || eval == 'init' || eval == 'frame'),
+  })  : assert(eval == null || eval == 'init' || eval == 'frame'),
         assert(interl == null || interl == 1 || interl == 0 || interl == -1);
 
   /// Width for scale
@@ -52,14 +50,14 @@ class ScaleFilter implements Filter {
   @override
   String toCli() {
     final properties = [
-      if (width != null) 'width=$width',
-      if (height != null) 'height=$height',
+      if (width != null && size == null) 'width=$width',
+      if (height != null && size == null) 'height=$height',
       if (eval != null) 'eval=$eval',
       if (interl != null) 'interl=$interl',
       if (swsFlags != null) 'sws_flags=${swsFlags!.cliValue}',
       if (param0 != null) 'param0=$param0',
       if (param1 != null) 'param1=$param1',
-      if (size != null) 'size=$size',
+      if (size != null) 'size=${size!.toCli()}',
     ];
 
     return 'scale=${properties.join(':')}';
diff --git a/lib/src/ffmpeg/video_size.dart b/lib/src/ffmpeg/video_size.dart
index 337f71f..de03278 100644
--- a/lib/src/ffmpeg/video_size.dart
+++ b/lib/src/ffmpeg/video_size.dart
@@ -1,11 +1,14 @@
+import 'package:ffmpeg_cli/src/ffmpeg/video_size_abbreviation.dart';
+
 class VideoSize {
-  const VideoSize({
-    required this.width,
-    required this.height,
-  });
+  const VideoSize({this.width, this.height, this.abbreviation})
+      : assert(width != null && height != null || abbreviation != null);
+
+  final num? width;
+  final num? height;
+  final VideoSizeAbbreviation? abbreviation;
 
-  final num width;
-  final num height;
+  String toCli() => abbreviation?.cliValue ?? '${width}x$height';
 
   @override
   String toString() => '[Size]: ${width}x$height';
diff --git a/lib/src/ffmpeg/video_size_abbreviation.dart b/lib/src/ffmpeg/video_size_abbreviation.dart
new file mode 100644
index 0000000..531899b
--- /dev/null
+++ b/lib/src/ffmpeg/video_size_abbreviation.dart
@@ -0,0 +1,60 @@
+class VideoSizeAbbreviation {
+  static const ntsc = VideoSizeAbbreviation._('ntsc');
+  static const pal = VideoSizeAbbreviation._('pal');
+  static const qntsc = VideoSizeAbbreviation._('qntsc');
+  static const qpal = VideoSizeAbbreviation._('qpal');
+  static const sntsc = VideoSizeAbbreviation._('sntsc');
+  static const spal = VideoSizeAbbreviation._('spal');
+  static const film = VideoSizeAbbreviation._('film');
+  static const ntscFilm = VideoSizeAbbreviation._('ntsc-film');
+  static const sqcif = VideoSizeAbbreviation._('sqcif');
+  static const qcif = VideoSizeAbbreviation._('qcif');
+  static const cif = VideoSizeAbbreviation._('cif');
+  static const cif4 = VideoSizeAbbreviation._('4cif');
+  static const cif16 = VideoSizeAbbreviation._('16cif');
+  static const qqvga = VideoSizeAbbreviation._('qqvga');
+  static const qvga = VideoSizeAbbreviation._('qvga');
+  static const vga = VideoSizeAbbreviation._('vga');
+  static const svga = VideoSizeAbbreviation._('svga');
+  static const xga = VideoSizeAbbreviation._('xga');
+  static const uxga = VideoSizeAbbreviation._('uxga');
+  static const qxga = VideoSizeAbbreviation._('qxga');
+  static const sxga = VideoSizeAbbreviation._('sxga');
+  static const qsxga = VideoSizeAbbreviation._('qsxga');
+  static const hsxga = VideoSizeAbbreviation._('hsxga');
+  static const wvga = VideoSizeAbbreviation._('wvga');
+  static const wxga = VideoSizeAbbreviation._('wxga');
+  static const wsxga = VideoSizeAbbreviation._('wsxga');
+  static const wuxga = VideoSizeAbbreviation._('wuxga');
+  static const woxga = VideoSizeAbbreviation._('woxga');
+  static const wqsxga = VideoSizeAbbreviation._('wqsxga');
+  static const wquxga = VideoSizeAbbreviation._('wquxga');
+  static const whsxga = VideoSizeAbbreviation._('whsxga');
+  static const whuxga = VideoSizeAbbreviation._('whuxga');
+  static const cga = VideoSizeAbbreviation._('cga');
+  static const ega = VideoSizeAbbreviation._('ega');
+  static const hd480 = VideoSizeAbbreviation._('hd480');
+  static const hd720 = VideoSizeAbbreviation._('hd720');
+  static const hd1080 = VideoSizeAbbreviation._('hd1080');
+  static const resolution2k = VideoSizeAbbreviation._('2k');
+  static const flat2k = VideoSizeAbbreviation._('2kflat');
+  static const scope2k = VideoSizeAbbreviation._('2kscope');
+  static const resolution4k = VideoSizeAbbreviation._('4k');
+  static const flat4k = VideoSizeAbbreviation._('4kflat');
+  static const scope4k = VideoSizeAbbreviation._('4kscope');
+  static const nhd = VideoSizeAbbreviation._('nhd');
+  static const hqvga = VideoSizeAbbreviation._('hqvga');
+  static const wqvga = VideoSizeAbbreviation._('wqvga');
+  static const fwqvga = VideoSizeAbbreviation._('fwqvga');
+  static const hvga = VideoSizeAbbreviation._('hvga');
+  static const qhd = VideoSizeAbbreviation._('qhd');
+  static const dci2k = VideoSizeAbbreviation._('2kdci');
+  static const dci4k = VideoSizeAbbreviation._('4kdci');
+  static const uhd2160 = VideoSizeAbbreviation._('uhd2160');
+  static const uhd4320 = VideoSizeAbbreviation._('uhd4320');
+
+  const VideoSizeAbbreviation._(this.cliValue);
+  final String cliValue;
+
+  String toCli() => cliValue;
+}