increase udp kernel read buffer size to minimize packet losses (#124)

go.mod

@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
-	github.com/aler9/gortsplib v0.0.0-20201122142543-a4849198e079
+	github.com/aler9/gortsplib v0.0.0-20201125201250-8305ca75f0f3
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51

go.sum

@@ -2,8 +2,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafo
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/aler9/gortsplib v0.0.0-20201122142543-a4849198e079 h1:TWNsK8SVomKWW1EO5W4TCefDuF8IfekXe4FxOQSUmrA=
-github.com/aler9/gortsplib v0.0.0-20201122142543-a4849198e079/go.mod h1:8P09VjpiPJFyfkVosyF5/TY82jNwkMN165NS/7sc32I=
+github.com/aler9/gortsplib v0.0.0-20201125201250-8305ca75f0f3 h1:+17Dx4RhHIFoMxPcbER8AXlRWPvw6c8BqjZMo+JVjJE=
+github.com/aler9/gortsplib v0.0.0-20201125201250-8305ca75f0f3/go.mod h1:8P09VjpiPJFyfkVosyF5/TY82jNwkMN165NS/7sc32I=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=

internal/serverudp/server.go

@@ -11,6 +11,9 @@ import (
 )
 
 const (
+	// use the same buffer size as gstreamer's rtspsrc
+	kernelReadBufferSize = 0x80000
+
 	readBufferSize = 2048
 )
 
@@ -73,6 +76,11 @@ func New(writeTimeout time.Duration,
 		return nil, err
 	}
 
+	err = pc.SetReadBuffer(kernelReadBufferSize)
+	if err != nil {
+		return nil, err
+	}
+
 	s := &Server{
 		writeTimeout: writeTimeout,
 		streamType:   streamType,