Use MediaMetadataRetriever to retrieve frame from mp4 interactively

MediaMetadataRetriever class, added from API Level 10, provides a unified interface for retrieving frame and meta data from an input media file. This example show how to retrieve frame from mp4 file interactively.


MainActivity.java

package com.example.androidmediametadataretriever;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.MediaMetadataRetriever;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore.Images;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

 ImageView capturedImageView; 
 Button btnOpen;
 TextView textInfo, textMaxDur, textCurDur;
 SeekBar timeFrameBar;
 
 long maxDur;
 
 MediaMetadataRetriever mediaMetadataRetriever = null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  btnOpen = (Button)findViewById(R.id.open);
  textInfo = (TextView)findViewById(R.id.info);
  textMaxDur = (TextView)findViewById(R.id.maxdur);
  textCurDur = (TextView)findViewById(R.id.curdur);
  timeFrameBar = (SeekBar)findViewById(R.id.timeframe);

  capturedImageView = (ImageView) findViewById(R.id.capturedimage);

  mediaMetadataRetriever = new MediaMetadataRetriever();

  btnOpen.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {

    Intent intent = new Intent(Intent.ACTION_GET_CONTENT, 
      Images.Media.EXTERNAL_CONTENT_URI);
    intent.setType("video/mp4");
    startActivityForResult(intent, 0);
   }});

  timeFrameBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){

   @Override
   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {}

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {}

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
    updateFrame();
   }});
 }
 
 private void updateFrame(){
  int frameProgress = timeFrameBar.getProgress();
  
  long frameTime = maxDur * frameProgress/100;
  
  textCurDur.setText(String.valueOf(frameTime) + " us");
  Bitmap bmFrame = mediaMetadataRetriever.getFrameAtTime(frameTime);
  capturedImageView.setImageBitmap(bmFrame);
 }
 

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  
  if(resultCode == RESULT_OK){
   Uri uri = data.getData();
   textInfo.setText(uri.toString());
   
   MediaMetadataRetriever tRetriever = new MediaMetadataRetriever();

   try{
    tRetriever.setDataSource(getBaseContext(), uri);
    
    mediaMetadataRetriever = tRetriever;
    //extract duration in millisecond, as String
    String DURATION = mediaMetadataRetriever.extractMetadata(
        MediaMetadataRetriever.METADATA_KEY_DURATION);
    textMaxDur.setText(DURATION + " ms");
    //convert to us, as int
    maxDur = (long)(1000*Double.parseDouble(DURATION));

    timeFrameBar.setProgress(0);
    updateFrame();
   }catch(RuntimeException e){
    e.printStackTrace();
    Toast.makeText(MainActivity.this, 
      "Something Wrong!", 
      Toast.LENGTH_LONG).show();
   }
   
  }
 }

}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.androidmediametadataretriever.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <Button
        android:id="@+id/open"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Open"/>
    <TextView
        android:id="@+id/info"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/maxdur"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/curdur"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <SeekBar
        android:id="@+id/timeframe"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="0"/>
        
    <ImageView
        android:id="@+id/capturedimage"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

Permission of "android.permission.READ_EXTERNAL_STORAGE" is needed in AndroidManifest.xml. And android:minSdkVersion have to be 10 or higher.

Download the files.

Next:
- Create animated GIF from MP4