diff --git a/app/loopedworld/src/main/java/su/rst10h/loopedworld/HelloSurface.kt b/app/loopedworld/src/main/java/su/rst10h/loopedworld/HelloSurface.kt
index b5576a3..5add83e 100644
--- a/app/loopedworld/src/main/java/su/rst10h/loopedworld/HelloSurface.kt
+++ b/app/loopedworld/src/main/java/su/rst10h/loopedworld/HelloSurface.kt
@@ -200,21 +200,25 @@ class HelloSurface : SurfaceView, SurfaceHolder.Callback {
         }
     }
     fun render() {
-        persistentSurface?.let {
-            val pCanvas = it.lockCanvas(null)
-            clearCanvas(pCanvas)
-            synchronized(it) {
-                drawHello(pCanvas, _frameNumber)
+        persistentSurface?.let {surface ->
+            val pCanvas = surface.lockCanvas(null)
+            pCanvas?.let {
+                clearCanvas(it)
+                synchronized(surface) {
+                    drawHello(it, _frameNumber)
+                }
+                surface.unlockCanvasAndPost(pCanvas)
             }
-            it.unlockCanvasAndPost(pCanvas)
         }
     }
 
     fun preview() {
         val canvas = holder.lockCanvas()
-        clearCanvas(canvas)
-        drawHello(canvas, _frameNumber)
-        holder.unlockCanvasAndPost(canvas)
+        canvas?.let {
+            clearCanvas(it)
+            drawHello(it, _frameNumber)
+            holder.unlockCanvasAndPost(it)
+        }
     }
 
     override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index d9e7b49..dd382af 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -12,10 +12,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Inspiry">
-        <activity android:name=".MainActivity">
+        <activity android:name=".ui.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
diff --git a/app/src/main/java/su/rst10h/inspiry/Constants.kt b/app/src/main/java/su/rst10h/inspiry/Constants.kt
new file mode 100644
index 0000000..df6e868
--- /dev/null
+++ b/app/src/main/java/su/rst10h/inspiry/Constants.kt
@@ -0,0 +1,4 @@
+package su.rst10h.inspiry
+
+const val MEDIA_FOLDER = "test"
+const val MEDIA_FILE_NAME = "TestVideo.mp4"
\ No newline at end of file
diff --git a/app/src/main/java/su/rst10h/inspiry/data/ActivityState.kt b/app/src/main/java/su/rst10h/inspiry/data/ActivityState.kt
index 8c3e936..11c222f 100644
--- a/app/src/main/java/su/rst10h/inspiry/data/ActivityState.kt
+++ b/app/src/main/java/su/rst10h/inspiry/data/ActivityState.kt
@@ -2,5 +2,7 @@ package su.rst10h.inspiry.data
 
 enum class ActivityState {
     WAIT,
-    RENDER
+    RENDERING,
+    RENDERED,
+    OPEN_MEDIA
 }
\ No newline at end of file
diff --git a/app/src/main/java/su/rst10h/inspiry/repository/CanvasRecorder.kt b/app/src/main/java/su/rst10h/inspiry/repository/CanvasRecorder.kt
index 930166f..5e65ec2 100644
--- a/app/src/main/java/su/rst10h/inspiry/repository/CanvasRecorder.kt
+++ b/app/src/main/java/su/rst10h/inspiry/repository/CanvasRecorder.kt
@@ -7,6 +7,7 @@ import android.view.Surface
 import su.rst10h.loopedworld.HelloSurface
 import java.io.File
 
+@Deprecated("Это тоже работает, но кривовато - нет синхронизации фреймов. Лучше использовать VideoEncoder")
 class CanvasRecorder(private val helloSurface: HelloSurface, appPath: File) {
 
     private var recorder: MediaRecorder
diff --git a/app/src/main/java/su/rst10h/inspiry/repository/VideoEncoder.kt b/app/src/main/java/su/rst10h/inspiry/repository/VideoEncoder.kt
index 368eb8f..fffc124 100644
--- a/app/src/main/java/su/rst10h/inspiry/repository/VideoEncoder.kt
+++ b/app/src/main/java/su/rst10h/inspiry/repository/VideoEncoder.kt
@@ -8,6 +8,8 @@ import android.util.Log
 import android.view.Surface
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
+import su.rst10h.inspiry.MEDIA_FILE_NAME
+import su.rst10h.inspiry.MEDIA_FOLDER
 import su.rst10h.loopedworld.HelloSurface
 import java.io.File
 
@@ -15,8 +17,10 @@ class VideoEncoder(private val baseFileDir: File, private val helloSurface: Hell
 
     private val bufferInfo = MediaCodec.BufferInfo()
     private val mediaEncoder: MediaCodec
-    private val inputSurface: Surface
+    private lateinit var inputSurface: Surface
+
     var onStopRecord = {}
+
     init {
         val format = MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_AVC, 1080, 1920)
         format.setInteger(
@@ -31,11 +35,14 @@ class VideoEncoder(private val baseFileDir: File, private val helloSurface: Hell
         inputSurface = mediaEncoder.createInputSurface()
 
     }
+
     private lateinit var mediaMuxer: MediaMuxer
     private var muxerTrackIndex = -1
     @Volatile var isRunning = false
 
     fun startRender() {
+
+        muxerTrackIndex = -1
         val file = File(prepareFilePath(baseFileDir))
         if (!file.exists()) file.delete()
         mediaMuxer = MediaMuxer(file.absolutePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4)
@@ -60,8 +67,7 @@ class VideoEncoder(private val baseFileDir: File, private val helloSurface: Hell
         while (isRunning) {
             val encoderStatus = mediaEncoder.dequeueOutputBuffer(bufferInfo, 10000L)
             when(encoderStatus) {
-                MediaCodec.INFO_TRY_AGAIN_LATER -> {
-                }
+                MediaCodec.INFO_TRY_AGAIN_LATER -> { }
                 MediaCodec.INFO_OUTPUT_FORMAT_CHANGED -> {
                     Log.d("encoder", "start muxer $muxerTrackIndex")
                     val newFormat: MediaFormat = mediaEncoder.outputFormat
@@ -83,17 +89,20 @@ class VideoEncoder(private val baseFileDir: File, private val helloSurface: Hell
                 }
             }
         }
-        Log.d("encoder", "File closed")
+        Log.d("encoder","stop encoding")
         mediaMuxer.stop()
+        mediaMuxer.release()
+        mediaEncoder.stop()
+
     }
     private fun prepareFilePath(appPath: File): String {
-        val fullPath = appPath.absolutePath+"/test/"
+        val fullPath = appPath.absolutePath+"/$MEDIA_FOLDER/"
         if (!File(fullPath).exists()) {
             if (!File(fullPath).mkdir()) {
                 Log.d("main", "directory test not created")
                 throw Exception("The test directory does not exist and has not been created:\n$fullPath$\n")
             }
         }
-        return fullPath+"TestVideoEncoder2.mp4"
+        return fullPath+MEDIA_FILE_NAME
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/su/rst10h/inspiry/MainActivity.kt b/app/src/main/java/su/rst10h/inspiry/ui/MainActivity.kt
similarity index 53%
rename from app/src/main/java/su/rst10h/inspiry/MainActivity.kt
rename to app/src/main/java/su/rst10h/inspiry/ui/MainActivity.kt
index 59d155f..69363ea 100644
--- a/app/src/main/java/su/rst10h/inspiry/MainActivity.kt
+++ b/app/src/main/java/su/rst10h/inspiry/ui/MainActivity.kt
@@ -1,38 +1,50 @@
-package su.rst10h.inspiry
+package su.rst10h.inspiry.ui
 
-import androidx.appcompat.app.AppCompatActivity
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
-import android.util.Log
 import android.widget.Button
 import androidx.activity.viewModels
+import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
+import su.rst10h.inspiry.MEDIA_FILE_NAME
+import su.rst10h.inspiry.MEDIA_FOLDER
+import su.rst10h.inspiry.R
 import su.rst10h.inspiry.data.ActivityState
-
 import su.rst10h.loopedworld.HelloSurface
 
+
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
         AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
         setContentView(R.layout.activity_main)
+
         val viewModel : MainViewModel by viewModels()
 
         val btn = findViewById<Button>(R.id.button)
         val surfaceView = findViewById<HelloSurface>(R.id.testView)
 
-        viewModel.state.observe(this,{
-            when(it) {
+        viewModel.state.observe(this, { state ->
+            when (state) {
                 ActivityState.WAIT -> {
-                    Log.d("main", "record stopped")
                     btn.text = "Render Template"
                     btn.isEnabled = true
                 }
-                ActivityState.RENDER -> {
-                    Log.d("main", "record started")
-                    btn.text = "Rendering.."
+                ActivityState.RENDERING -> {
+                    btn.text = "RENDERING.."
                     btn.isEnabled = false
                 }
+                ActivityState.RENDERED -> {
+                    btn.isEnabled = true
+                    btn.text = "OPEN MEDIA"
+                }
+                ActivityState.OPEN_MEDIA -> {
+                    openMedia()
+                    viewModel.reset_state()
+                }
             }
         })
 
@@ -41,7 +53,15 @@ class MainActivity : AppCompatActivity() {
         }
 
         btn.setOnClickListener {
-            viewModel.renderTemplate()
+            viewModel.action()
         }
     }
+    private fun openMedia() {
+        val intent = Intent(Intent.ACTION_VIEW)
+        intent.setDataAndType(Uri.parse(
+                getExternalFilesDir(null)?.absolutePath+
+                        "/$MEDIA_FOLDER/$MEDIA_FILE_NAME"),
+                "video/mp4")
+        startActivity(intent)
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/su/rst10h/inspiry/MainViewModel.kt b/app/src/main/java/su/rst10h/inspiry/ui/MainViewModel.kt
similarity index 74%
rename from app/src/main/java/su/rst10h/inspiry/MainViewModel.kt
rename to app/src/main/java/su/rst10h/inspiry/ui/MainViewModel.kt
index 3d8ea82..680000c 100644
--- a/app/src/main/java/su/rst10h/inspiry/MainViewModel.kt
+++ b/app/src/main/java/su/rst10h/inspiry/ui/MainViewModel.kt
@@ -1,11 +1,9 @@
-package su.rst10h.inspiry
+package su.rst10h.inspiry.ui
 
-import android.graphics.Canvas
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import su.rst10h.inspiry.data.*
 import su.rst10h.inspiry.data.ActivityState.*
-import su.rst10h.inspiry.repository.CanvasRecorder
 import su.rst10h.inspiry.repository.VideoEncoder
 import su.rst10h.loopedworld.HelloSurface
 import java.io.File
@@ -23,18 +21,24 @@ class MainViewModel: ViewModel() {
         videoEncoder = VideoEncoder(appPath, surface)
     }
 
-    fun renderTemplate() {
+    fun reset_state() {
+        state.postValue(WAIT)
+    }
+
+    fun action() {
         when (state.value) {
             WAIT -> {
                 videoEncoder.onStopRecord = {
-                    state.postValue(WAIT)
+                    state.postValue(RENDERED)
                     }
                 videoEncoder.startRender()
-                state.postValue(RENDER)
+                state.postValue(RENDERING)
             }
-            RENDER -> {
-                state.postValue(WAIT)
+            RENDERED -> {
+                state.postValue(OPEN_MEDIA)
             }
+
+
         }
     }
 
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 13e7d09..09653a9 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".ui.MainActivity">
 
     <su.rst10h.loopedworld.HelloSurface
         android:id="@+id/testView"