Downgrade requirements for an old Ubuntu

README.md

@@ -58,6 +58,9 @@ a better sense of performance.
   , [libopus](http://opus-codec.org/), [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/)
   , [sdl2](https://wiki.libsdl.org/Installation)
 
+(If you need to use the app on an older version of Ubuntu that does not have libyuv, you can add a custom apt repository: 
+`add sudo add-apt-repository ppa:savoury1/graphics`)
+
 ```
 # Ubuntu / Windows (WSL2)
 apt-get install -y make gcc pkg-config libvpx-dev libx264-dev libopus-dev libsdl2-dev libyuv-dev libjpeg-turbo8-dev

pkg/encoder/h264/x264.go

@@ -33,8 +33,8 @@ type Options struct {
 func NewEncoder(w, h int, th int, opts *Options) (encoder *H264, err error) {
 	libVersion := LibVersion()
 
-	if libVersion < 156 {
-		return nil, fmt.Errorf("x264: the library version should be newer than v155, you have got version %v", libVersion)
+	if libVersion < 150 {
+		return nil, fmt.Errorf("x264: the library version should be newer than v150, you have got version %v", libVersion)
 	}
 
 	if opts == nil {
@@ -64,7 +64,11 @@ func NewEncoder(w, h int, th int, opts *Options) (encoder *H264, err error) {
 	ww, hh := int32(w), int32(h)
 
 	param.IBitdepth = 8
-	param.ICsp = CspI420
+	if libVersion > 155 {
+		param.ICsp = CspI420
+	} else {
+		param.ICsp = 1
+	}
 	param.IWidth = ww
 	param.IHeight = hh
 	param.ILogLevel = opts.LogLevel