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• x264 library speed - Altivec vs SSE4 -

  15 août 2015, par Asain Kujovic

  I have simple cheap dualcore intel-3ghz-debian and access to super-expensive powerPc7-Aix.

  And after few days of strugle, i compiled libx264 and tested it on both computers :

  1. GCC : library x264 on intel (with SSE2 capabilities) and
  2. GCC on 16 core powerPc (with altivec).

  ... and result is that cheap intel is x2 times faster ! (with altivec disabled, intel is 10x times faster)

  My question : is this normal ?
  Does all other powerPC-users have same results ? Can powerPc-altivec-optimisation of x264 library work at same speed with intel... or MMX/SSE optimisation is officially at least 2 times faster for this library ?

  I am not interested in multi-thread options. Number of cores and threads are irrelevant. Just simple one-thread x264 encoding with default "medium preset" using rawvideo as source, sse vs altivec.

  Maybe native Aix XLC compiler provide better results ? (i managed only gcc to work)

  ... mac-powerpc-users maybe know something about this.

  powrPc7-Aix:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
  
  x264: 64-bit XCOFF
  
  x264 [info]: using cpu capabilities: Altivec
  
  time: real 0m33.559s
  
  ---
  
  intelDebian:$ time (cat raw10sec.y4m |x264 --input-res 720x576 --fps 50 -o /dev/null -)
  
  x264: ELF 32-bit LSB executable
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
  
  time: real 0m16.503s

• How to install JavaCV on Android and use FrameGrabber

  9 octobre 2016, par Mark

  Could someone tell me where I’m doing wrong ? These are the steps that I have followed :

  1. Downloaded the adt-bundle-windows from android developer website
  2. Created a new project and a libs/armeabi folder

  3. Extract all the *.so files from javacv-android-arm.jar, opencv-2.4.3-android-arm.zip, and ffmpeg-1.0-android-arm.zip directly into the newly created "libs/armeabi" folder, without creating any new subdirectories.

     (A part that I don’t understand is "Extract all the *.so files from javacv-android-arm.jar", I simply inserted the javacv-android-arm.jar file inside libs/armeabi folder)

  4. Navigated to Project > Properties > Java Build Path > Libraries and click "Add JARs...".
  5. Selected both javacpp.jar and javacv.jar from the newly created "libs" folder.

  After that I have downloaded OpenCV2.4.3 from here and ffmpeg from here and extracted the files on my C :/ root.
  Finally after setting my system path...,

  C:\opencv\build\x64\vc10\bin;C:\ffmpeg-64\bin;C:\Program Files\Java\jdk1.7.0_10\bin

  ...if I try to use simply FrameGrabber in my Android application...

  import com.googlecode.javacv.FFmpegFrameGrabber;
  
  import com.googlecode.javacpp.Loader;
  
  import com.googlecode.javacv.*;
  
  import com.googlecode.javacv.cpp.*;
  
  import static com.googlecode.javacv.cpp.opencv_core.*;
  
  import static com.googlecode.javacv.cpp.opencv_imgproc.*;
  
  import static com.googlecode.javacv.cpp.opencv_calib3d.*;
  
  import static com.googlecode.javacv.cpp.opencv_objdetect.*;
  
  
  
  import android.os.Bundle;
  
  import android.app.Activity;
  
  import android.view.Menu;
  
  
  
  public class MainActivity extends Activity {
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
          FFmpegFrameGrabber i = new FFmpegFrameGrabber("/mnt/sdcard/SinglePerson.avi"); 
  
      }

  ...I get the following errors :

  01-29 17:59:26.976: E/AndroidRuntime(30656): FATAL EXCEPTION: main
  
  01-29 17:59:26.976: E/AndroidRuntime(30656): java.lang.NoClassDefFoundError: com.googlecode.javacv.FFmpegFrameGrabber
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.example.xxxxxxxxx.MainActivity.onCreate(MainActivity.java:23)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.Activity.performCreate(Activity.java:4465)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.os.Handler.dispatchMessage(Handler.java:99)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.os.Looper.loop(Looper.java:137)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at android.app.ActivityThread.main(ActivityThread.java:4424)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at java.lang.reflect.Method.invokeNative(Native Method)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at java.lang.reflect.Method.invoke(Method.java:511)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  
  01-29 17:59:26.976: E/AndroidRuntime(30656):    at dalvik.system.NativeStart.main(Native Method)

  Someone can help me please ?

• django upload and convert and save

  31 août 2015, par hessam zaheri

  I have a form in django that I upload an avi movie and I want to convert to mp4 and save in media root and save path in database record :

  class Content(models.Model):
  
      content_title_en = models.CharField(max_length=255) 
  
      content_movie = models.FileField(verbose_name='movie')
  
  
  
      def save(self, *args, **kwargs):
  
          if self.content_movie:
  
              os.popen("ffmpeg -i C:/new/Wildlife.wmv video.mp4")
  
          super(Content, self).save(*args, **kwargs)

  and I convert file but I don’t know how save in file and my database record.