diff --git a/ffmpeg/audio_filter.go b/ffmpeg/audio_filter.go
index 2693f63..9ca510e 100644
--- a/ffmpeg/audio_filter.go
+++ b/ffmpeg/audio_filter.go
@@ -5,7 +5,7 @@ import (
 	"github.com/Paxx-RnD/go-ffmpeg/arguments"
 )
 
-func (f *Ffmpeg) Flanger(delay float64) *Ffmpeg {
+func (f *Ffmpeg) Flanger(delay float64) IFfmpeg {
 	if delay < 0 {
 		delay = 0
 	} else if delay > 30 {
diff --git a/ffmpeg/bitrate.go b/ffmpeg/bitrate.go
index e13d908..7f9dbe5 100644
--- a/ffmpeg/bitrate.go
+++ b/ffmpeg/bitrate.go
@@ -4,12 +4,12 @@ import (
 	"fmt"
 )
 
-func (f *Ffmpeg) BitrateVideo(bitrate int) *Ffmpeg {
+func (f *Ffmpeg) BitrateVideo(bitrate int) IFfmpeg {
 	f.arguments.Options.Append("-b:v", fmt.Sprintf("%d", bitrate))
 	return f
 }
 
-func (f *Ffmpeg) BitrateAudio(bitrate int) *Ffmpeg {
+func (f *Ffmpeg) BitrateAudio(bitrate int) IFfmpeg {
 	f.arguments.Options.Append("-b:a", fmt.Sprintf("%d", bitrate))
 	return f
 }
diff --git a/ffmpeg/builder.go b/ffmpeg/builder.go
index 42fbbf2..1f8585d 100644
--- a/ffmpeg/builder.go
+++ b/ffmpeg/builder.go
@@ -7,9 +7,13 @@ import (
 	"strings"
 )
 
+type IBuilder interface {
+	Build() []string
+}
+
 type Builder Ffmpeg
 
-func (f *Ffmpeg) Output(path string) *Builder {
+func (f *Ffmpeg) Output(path string) IBuilder {
 	f.arguments.Output.Append(path)
 	return (*Builder)(f)
 }
diff --git a/ffmpeg/chain.go b/ffmpeg/chain.go
index 1cfce0b..5a5c9c6 100644
--- a/ffmpeg/chain.go
+++ b/ffmpeg/chain.go
@@ -6,51 +6,70 @@ import (
 	"github.com/Paxx-RnD/go-helper/helpers/boolean_helper"
 )
 
+type IChain interface {
+	Format(input string, format pixel_formats.PixelFormat, output string) IChain
+	Pad(input string, width int, height int, x int, y int, output string) IChain
+	Volume(input string, volume float64, output string) IChain
+	Fps(input string, fps float64, output string) IChain
+	Scale(input string, width float64, height float64, output string) IChain
+	Reverse(input string, output string) IChain
+	Trim(input string, start float64, end float64, output string) IChain
+	Split(input string, outputs ...string) IChain
+	ATrim(input string, start float64, end float64, output string) IChain
+	AlphaExtract(input string, output string) IChain
+	AlphaMerge(input string, mask string, shortest bool, output string) IChain
+	Concat(inputs []string, videoEnable bool, audioEnable bool, output string) IChain
+	Overlay(under string, over string, shortest bool, output string) IChain
+	ACrossFade(input1 string, input2 string, duration float64, output string) IChain
+	ADelay(input string, delay float64, output string) IChain
+	Map(output string) IMap
+}
+
 type Chain Ffmpeg
 
-func (fg *Chain) Format(input string, format pixel_formats.PixelFormat, output string) *Chain {
+func (fg *Chain) Format(input string, format pixel_formats.PixelFormat, output string) IChain {
 	chain := fmt.Sprintf("[%s]format=%s[%s]", input, format, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Pad(input string, width int, height int, x int, y int, output string) *Chain {
+func (fg *Chain) Pad(input string, width int, height int, x int, y int, output string) IChain {
 	chain := fmt.Sprintf("[%s]pad=width=%d:height=%d:x=%d:y=%d[%s]", input, width, height, x, y, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Volume(input string, volume float64, output string) *Chain {
+func (fg *Chain) Volume(input string, volume float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]volume=volume=%f[%s]", input, volume, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Fps(input string, fps float64, output string) *Chain {
+func (fg *Chain) Fps(input string, fps float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]fps=fps=%f[%s]", input, fps, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Scale(input string, width float64, height float64, output string) *Chain {
+func (fg *Chain) Scale(input string, width float64, height float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]scale=width=%f:height=%f[%s]", input, width, height, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Reverse(input string, output string) *Chain {
+func (fg *Chain) Reverse(input string, output string) IChain {
 	chain := fmt.Sprintf("[%s]reverse[%s]", input, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Trim(input string, start float64, end float64, output string) *Chain {
+func (fg *Chain) Trim(input string, start float64, end float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]trim=start=%f:end=%f,setpts=PTS-STARTPTS[%s]", input, start, end, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Split(input string, outputs ...string) *Chain {
+func (fg *Chain) Split(input string, outputs ...string) IChain {
 	chain := fmt.Sprintf("[%s]split=n=%d", input, len(outputs))
 	for _, output := range outputs {
 		chain += fmt.Sprintf("[%s]", output)
@@ -59,26 +78,26 @@ func (fg *Chain) Split(input string, outputs ...string) *Chain {
 	return fg
 }
 
-func (fg *Chain) ATrim(input string, start float64, end float64, output string) *Chain {
+func (fg *Chain) ATrim(input string, start float64, end float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]atrim=start=%f:end=%f,asetpts=PTS-STARTPTS[%s]", input, start, end, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) AlphaExtract(input string, output string) *Chain {
+func (fg *Chain) AlphaExtract(input string, output string) IChain {
 	chain := fmt.Sprintf("[%s]alphaextract[%s]", input, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) AlphaMerge(input string, mask string, shortest bool, output string) *Chain {
+func (fg *Chain) AlphaMerge(input string, mask string, shortest bool, output string) IChain {
 	short := boolean_helper.ToInt(shortest)
 	chain := fmt.Sprintf("[%s][%s]alphamerge=shortest=%d[%s]", input, mask, short, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) Concat(inputs []string, videoEnable bool, audioEnable bool, output string) *Chain {
+func (fg *Chain) Concat(inputs []string, videoEnable bool, audioEnable bool, output string) IChain {
 	toConcat := make([]string, len(inputs))
 	for i, input := range inputs {
 		toConcat[i] = fmt.Sprintf("[%s]", input)
@@ -92,20 +111,20 @@ func (fg *Chain) Concat(inputs []string, videoEnable bool, audioEnable bool, out
 	return fg
 }
 
-func (fg *Chain) Overlay(under string, over string, shortest bool, output string) *Chain {
+func (fg *Chain) Overlay(under string, over string, shortest bool, output string) IChain {
 	short := boolean_helper.ToInt(shortest)
 	chain := fmt.Sprintf("[%s][%s]overlay=shortest=%d[%s]", under, over, short, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) ACrossFade(input1 string, input2 string, duration float64, output string) *Chain {
+func (fg *Chain) ACrossFade(input1 string, input2 string, duration float64, output string) IChain {
 	chain := fmt.Sprintf("[%s][%s]acrossfade=d=%f[%s]", input1, input2, duration, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
 }
 
-func (fg *Chain) ADelay(input string, delay float64, output string) *Chain {
+func (fg *Chain) ADelay(input string, delay float64, output string) IChain {
 	chain := fmt.Sprintf("[%s]adelay=%f[%s]", input, delay, output)
 	fg.arguments.FilterGraph.FilterChain = append(fg.arguments.FilterGraph.FilterChain, chain)
 	return fg
diff --git a/ffmpeg/codec.go b/ffmpeg/codec.go
index fe04261..f74a91e 100644
--- a/ffmpeg/codec.go
+++ b/ffmpeg/codec.go
@@ -5,12 +5,12 @@ import (
 	"github.com/Paxx-RnD/go-ffmpeg/constants/codec_video"
 )
 
-func (f *Ffmpeg) CodecVideo(codec codec_video.CodecVideo) *Ffmpeg {
+func (f *Ffmpeg) CodecVideo(codec codec_video.CodecVideo) IFfmpeg {
 	f.arguments.Options.Append("-c:v", string(codec))
 	return f
 }
 
-func (f *Ffmpeg) CodecAudio(codec codec_audio.CodecAudio) *Ffmpeg {
+func (f *Ffmpeg) CodecAudio(codec codec_audio.CodecAudio) IFfmpeg {
 	f.arguments.Options.Append("-c:a", string(codec))
 	return f
 }
diff --git a/ffmpeg/ffmpeg.go b/ffmpeg/ffmpeg.go
index a85e926..745a4a6 100644
--- a/ffmpeg/ffmpeg.go
+++ b/ffmpeg/ffmpeg.go
@@ -3,8 +3,25 @@ package ffmpeg
 import (
 	"github.com/Paxx-RnD/go-ffmpeg/arguments"
 	"github.com/Paxx-RnD/go-ffmpeg/configuration"
+	"github.com/Paxx-RnD/go-ffmpeg/constants/codec_audio"
+	"github.com/Paxx-RnD/go-ffmpeg/constants/codec_video"
 )
 
+type IFfmpeg interface {
+	BitrateVideo(bitrate int) IFfmpeg
+	BitrateAudio(bitrate int) IFfmpeg
+	Flanger(delay float64) IFfmpeg
+	CodecVideo(codec codec_video.CodecVideo) IFfmpeg
+	CodecAudio(codec codec_audio.CodecAudio) IFfmpeg
+	Scale(width int, height int) IFfmpeg
+	Fps(fps float64) IFfmpeg
+	FilterGraph() IChain
+	Input(path string) IFfmpeg
+	Inputs(paths ...string) IFfmpeg
+	Output(path string) IBuilder
+	Run(args []string) error
+}
+
 type Ffmpeg struct {
 	arguments     Arguments
 	Configuration *configuration.Configuration
@@ -20,12 +37,12 @@ type Arguments struct {
 	Options      arguments.Options
 }
 
-func (f *Ffmpeg) Input(path string) *Ffmpeg {
+func (f *Ffmpeg) Input(path string) IFfmpeg {
 	f.arguments.Inputs.Append(path)
 	return f
 }
 
-func (f *Ffmpeg) Inputs(paths ...string) *Ffmpeg {
+func (f *Ffmpeg) Inputs(paths ...string) IFfmpeg {
 	for _, p := range paths {
 		f.arguments.Inputs.Append(p)
 	}
diff --git a/ffmpeg/filtergraph.go b/ffmpeg/filtergraph.go
index 37e120c..fd844e4 100644
--- a/ffmpeg/filtergraph.go
+++ b/ffmpeg/filtergraph.go
@@ -7,7 +7,7 @@ type FilterGraph struct {
 	MapChain    []string
 }
 
-func (f *Ffmpeg) FilterGraph() *Chain {
+func (f *Ffmpeg) FilterGraph() IChain {
 	return &Chain{
 		arguments:     f.arguments,
 		Configuration: f.Configuration,
diff --git a/ffmpeg/map.go b/ffmpeg/map.go
index cda05f0..cfb9195 100644
--- a/ffmpeg/map.go
+++ b/ffmpeg/map.go
@@ -2,9 +2,14 @@ package ffmpeg
 
 import "github.com/Paxx-RnD/go-ffmpeg/arguments"
 
+type IMap interface {
+	Map(output string) IMap
+	Output(output string) IBuilder
+}
+
 type Map Ffmpeg
 
-func (fg *Chain) Map(output string) *Map {
+func (fg *Chain) Map(output string) IMap {
 	m := Map{
 		arguments:     fg.arguments,
 		Configuration: fg.Configuration,
@@ -14,12 +19,12 @@ func (fg *Chain) Map(output string) *Map {
 	return &m
 }
 
-func (m *Map) Map(output string) *Map {
+func (m *Map) Map(output string) IMap {
 	m.arguments.FilterGraph.MapChain = append(m.arguments.FilterGraph.MapChain, output)
 	return m
 }
 
-func (m *Map) Output(output string) *Builder {
+func (m *Map) Output(output string) IBuilder {
 	builder := Builder{
 		arguments:     m.arguments,
 		Configuration: m.Configuration,
diff --git a/ffmpeg/video_filter.go b/ffmpeg/video_filter.go
index 79eb6a5..489ac36 100644
--- a/ffmpeg/video_filter.go
+++ b/ffmpeg/video_filter.go
@@ -5,7 +5,7 @@ import (
 	"github.com/Paxx-RnD/go-ffmpeg/arguments"
 )
 
-func (f *Ffmpeg) Scale(width int, height int) *Ffmpeg {
+func (f *Ffmpeg) Scale(width int, height int) IFfmpeg {
 	filter := arguments.Filter{
 		Name: "scale",
 		Args: []arguments.FilterArgs{
@@ -23,7 +23,7 @@ func (f *Ffmpeg) Scale(width int, height int) *Ffmpeg {
 	return f
 }
 
-func (f *Ffmpeg) Fps(fps float64) *Ffmpeg {
+func (f *Ffmpeg) Fps(fps float64) IFfmpeg {
 	filter := arguments.Filter{
 		Name: "fps",
 		Args: []arguments.FilterArgs{
diff --git a/test/a_main_test.go b/test/a_main_test.go
index 7db4f6a..ab0713c 100644
--- a/test/a_main_test.go
+++ b/test/a_main_test.go
@@ -26,7 +26,7 @@ func TestMain(m *testing.M) {
 	m.Run()
 }
 
-func GetFfmpeg() *ffmpeg.Ffmpeg {
+func GetFfmpeg() ffmpeg.IFfmpeg {
 	f := ffmpeg.Ffmpeg{
 		Configuration: configuration.GetConfiguration(),
 		Headers: []string{