Recherche avancée

Sur d’autres sites (8289)

• JavaCV record video in Android

  11 janvier 2017, par wyx

  I want to record video quiet and without preview in Android. So I choice MediaRecorder but I could record only without preview but what make me crazy is that when MediaRecorder start or stop it will with a sound dee.... I try many methods about that . But I think it perhaps sth related to the OS of the mobile. So I try JavaCV because I also want to have a Live function in my app.

  But JavaCV spent me to too much time to solve some strange problems because it’s my first time to do sth about C++ src and video.

  Just compile group: 'org.bytedeco', name: 'javacv-platform', version: '1.3' as the README.md ,I even can’t build my apk.

  Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
  
  > com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK org/bytedeco/javacpp/macosx-x86_64/libusb-1.0.dylib
  
      File1: /Users/wyx/.gradle/caches/modules-2/files-2.1/org.bytedeco.javacpp-presets/libfreenect/0.5.3-1.3/736d65a3ef042258429d8e7742128c411806b432/libfreenect-0.5.3-1.3-macosx-x86_64.jar
  
      File2: /Users/wyx/.gradle/caches/modules-2/files-2.1/org.bytedeco.javacpp-presets/libdc1394/2.2.4-1.3/f1498dacc46162ab68faeb8d66cf02b96fe41c61/libdc1394-2.2.4-1.3-macosx-x86_64.jar

  And then I modified it according this issuse
  use this to repalce. It can build the apk. But the can’t run.

    android {
  
     ..............
  
      packagingOptions {
  
          exclude 'META-INF/services/javax.annotation.processing.Processor'
  
          pickFirst  'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.properties'
  
          pickFirst  'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.xml'
  
          pickFirst  'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.properties'
  
          pickFirst  'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.xml'
  
      }
  
  }
  
  
  
  dependencies {
  
      compile group: 'org.bytedeco', name: 'javacv', version: '1.3'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '3.2.1-1.3', classifier: 'android-x86'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '3.2.1-1.3', classifier: 'android-arm'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '3.1.0-1.3', classifier: 'android-x86'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '3.1.0-1.3', classifier: 'android-arm'
  
  }

  My demo code VideoService which will invoke in MainActivity

  package com.fs.fs.api;
  
  
  
  import com.fs.fs.App;
  
  import com.fs.fs.utils.DateUtils;
  
  import com.fs.fs.utils.FileUtils;
  
  
  
  import org.bytedeco.javacpp.avcodec;
  
  import org.bytedeco.javacv.FFmpegFrameRecorder;
  
  import org.bytedeco.javacv.FrameRecorder;
  
  
  
  import java.util.Date;
  
  
  
  /**
  
   * Created by wyx on 2017/1/11.
  
   */
  
  public class VideoService {
  
      private FFmpegFrameRecorder mFrameRecorder;
  
      private String path;
  
  
  
      private VideoService() {
  
      }
  
  
  
      private static class SingletonHolder {
  
          private static final VideoService INSTANCE = new VideoService();
  
      }
  
  
  
      public static VideoService getInstance() {
  
          return SingletonHolder.INSTANCE;
  
      }
  
  
  
      public void startRecordVideo() {
  
          String fileName = String.format("%s.%s", DateUtils.date2String(new Date(), "yyyyMMdd_HHmmss"), "mp4");
  
          path = FileUtils.getExternalFullPath(App.getInstance(), fileName);
  
          mFrameRecorder = new FFmpegFrameRecorder(path, 640, 480, 1);
  
          mFrameRecorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
          mFrameRecorder.setVideoOption("tune", "zerolatency");
  
          mFrameRecorder.setVideoOption("preset", "ultrafast");
  
          mFrameRecorder.setVideoOption("crf", "28");
  
          mFrameRecorder.setVideoBitrate(300 * 1000);
  
          mFrameRecorder.setFormat("mp4");
  
  
  
          mFrameRecorder.setFrameRate(30);
  
          mFrameRecorder.setAudioOption("crf", "0");
  
          mFrameRecorder.setSampleRate(48 * 1000);
  
          mFrameRecorder.setAudioBitrate(960 * 1000);
  
          mFrameRecorder.setAudioCodec(avcodec.AV_CODEC_ID_AAC);
  
          try {
  
              mFrameRecorder.start();
  
          } catch (FrameRecorder.Exception e) {
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
      public void stop() {
  
          if (mFrameRecorder != null) {
  
              try {
  
                  mFrameRecorder.stop();
  
                  mFrameRecorder.release();
  
              } catch (FrameRecorder.Exception e) {
  
                  e.printStackTrace();
  
              }
  
              mFrameRecorder = null;
  
          }
  
      }
  
  
  
  }

  MainActivity

  package com.fs.fs.activity;
  
  
  
  import android.app.Activity;
  
  import android.os.Bundle;
  
  
  
  import com.fs.fs.R;
  
  import com.fs.fs.api.VideoService;
  
  
  
  import static java.lang.Thread.sleep;
  
  
  
  
  
  public class MainActivity extends Activity {
  
  
  
      @Override
  
      protected void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
  
  
          VideoService.getInstance().startRecordVideo();
  
          try {
  
              sleep(10 * 1000);
  
          } catch (InterruptedException e) {
  
              e.printStackTrace();
  
          }
  
          VideoService.getInstance().stop();
  
      }
  
  }

  Error which make me want to cry.

  E/AndroidRuntime: FATAL EXCEPTION: main
  
                    Process: com.fs.fs, PID: 30259
  
                    java.lang.NoClassDefFoundError: java.lang.ClassNotFoundException: org.bytedeco.javacpp.avutil
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:590)
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:530)
  
                        at org.bytedeco.javacpp.avcodec$AVPacket.<clinit>(avcodec.java:1694)
  
                        at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:149)
  
                        at com.fs.fs.api.VideoService.startRecordVideo(VideoService.java:34)
  
                        at com.fs.fs.activity.MainActivity.onCreate(MainActivity.java:75)
  
                        at android.app.Activity.performCreate(Activity.java:5304)
  
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090)
  
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245)
  
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2331)
  
                        at android.app.ActivityThread.access$1000(ActivityThread.java:143)
  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
  
                        at android.os.Handler.dispatchMessage(Handler.java:102)
  
                        at android.os.Looper.loop(Looper.java:136)
  
                        at android.app.ActivityThread.main(ActivityThread.java:5291)
  
                        at java.lang.reflect.Method.invokeNative(Native Method)
  
                        at java.lang.reflect.Method.invoke(Method.java:515)
  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
  
                        at dalvik.system.NativeStart.main(Native Method)
  
                     Caused by: java.lang.ClassNotFoundException: org.bytedeco.javacpp.avutil
  
                        at java.lang.Class.classForName(Native Method)
  
                        at java.lang.Class.forName(Class.java:251)
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:585)
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:530) 
  
                        at org.bytedeco.javacpp.avcodec$AVPacket.<clinit>(avcodec.java:1694) 
  
                        at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:149) 
  
                        at com.fs.fs.api.VideoService.startRecordVideo(VideoService.java:34) 
  
                        at com.fs.fs.activity.MainActivity.onCreate(MainActivity.java:75) 
  
                        at android.app.Activity.performCreate(Activity.java:5304) 
  
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090) 
  
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245) 
  
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2331) 
  
                        at android.app.ActivityThread.access$1000(ActivityThread.java:143) 
  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244) 
  
                        at android.os.Handler.dispatchMessage(Handler.java:102) 
  
                        at android.os.Looper.loop(Looper.java:136) 
  
                        at android.app.ActivityThread.main(ActivityThread.java:5291) 
  
                        at java.lang.reflect.Method.invokeNative(Native Method) 
  
                        at java.lang.reflect.Method.invoke(Method.java:515) 
  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 
  
                        at dalvik.system.NativeStart.main(Native Method) 
  
                     Caused by: java.lang.NoClassDefFoundError: org/bytedeco/javacpp/avutil
  
                        at java.lang.Class.classForName(Native Method) 
  
                        at java.lang.Class.forName(Class.java:251) 
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:585) 
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:530) 
  
                        at org.bytedeco.javacpp.avcodec$AVPacket.<clinit>(avcodec.java:1694) 
  
                        at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:149) 
  
                        at com.fs.fs.api.VideoService.startRecordVideo(VideoService.java:34) 
  
                        at com.fs.fs.activity.MainActivity.onCreate(MainActivity.java:75) 
  
                        at android.app.Activity.performCreate(Activity.java:5304) 
  
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090) 
  
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245) 
  
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2331) 
  
                        at android.app.ActivityThread.access$1000(ActivityThread.java:143) 
  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244) 
  
                        at android.os.Handler.dispatchMessage(Handler.java:102) 
  
                        at android.os.Looper.loop(Looper.java:136) 
  
                        at android.app.ActivityThread.main(ActivityThread.java:5291) 
  
                        at java.lang.reflect.Method.invokeNative(Native Method) 
  
                        at java.lang.reflect.Method.invoke(Method.java:515) 
  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 
  
                        at dalvik.system.NativeStart.main(Native Method) 
  
                     Caused by: java.lang.ClassNotFoundException: Didn't find class "org.bytedeco.javacpp.avutil" on path: DexPathList[[zip file "/data/app/com.fs.fs-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.fs.fs-2, /vendor/lib, /system/lib, /data/datalib]]
  
                        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
  
                        at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
  
                        at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
  
                        at java.lang.Class.classForName(Native Method) 
  
                        at java.lang.Class.forName(Class.java:251) 
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:585) 
  
                        at org.bytedeco.javacpp.Loader.load(Loader.java:530) 
  
                        at org.bytedeco.javacpp.avcodec$AVPacket.<clinit>(avcodec.java:1694) 
  
                        at org.bytedeco.javacv.FFmpegFrameRecorder.<init>(FFmpegFrameRecorder.java:149) 
  
                        at com.fs.fs.api.VideoService.startRecordVideo(VideoService.java:34) 
  
                        at com.fs.fs.activity.MainActivity.onCreate(MainActivity.java:75) 
  
                        at android.app.Activity.performCreate(Activity.java:5304) 
  
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090) 
  
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245) 
  
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2331) 
  
                        at android.app.ActivityThread.access$1000(ActivityThread.java:143) 
  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244) 
  
                        at android.os.Handler.dispatchMessage(Handler.java:102) 
  
                        at android.os.Looper.loop(Looper.java:136) 
  
                        at android.app.ActivityThread.main(ActivityThread.java:5291) 
  
                        at java.lang.reflect.Method.invokeNative(Native Method) 
  
                        at java.lang.reflect.Method.invoke(Method.java:515) 
  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 
  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 
  
                        at dalvik.system.NativeStart.main(Native Method) 
  
  </init></clinit></init></clinit></init></clinit></init></clinit>

  So I want to know a comfortable method to achieve my goal : recode video quiet and without preview. And Live real time ?

  I found ffmpeg4android is a prefect library to run ffmpeg command. I just use it to compress videos from MediaRecorder But I don’t how to do use it to achieve my goal.

• Summary Video Accessibility Talk

  1er janvier 2014, par silvia

  I’ve just got off a call to the UK Digital TV Group, for which I gave a talk on HTML5 video accessibility (slides best viewed in Google Chrome).

  The slide provide a high-level summary of the accessibility features that we’ve developed in the W3C for HTML5, including :

  • Subtitles & Captions with WebVTT and the track element
  • Video Descriptions with WebVTT, the track element and speech synthesis
  • Chapters with WebVTT for semantic navigation
  • Audio Descriptions through synchronising an audio track with a video
  • Sign Language video synchronized with a main video

  I received some excellent questions.

  The obvious one was about why WebVTT and not TTML. While for anyone who has tried to implement TTML support, the advantages of WebVTT should be clear, for some the decision of the browsers to go with WebVTT still seems to be bothersome. The advantages of CSS over XSL-FO in a browser-context are obvious, but not as much outside browsers. So, the simplicity of WebVTT and the clear integration with HTML have to speak for themselves. Conversion between TTML and WebVTT was a feature that was being asked for.

  I received a question about how to support ducking (reduce the volume of the main audio track) when using video descriptions. My reply was to either use video descriptions with WebVTT and do ducking during the times that a cue is active, or when using audio descriptions (i.e. actual audio tracks) to add an additional WebVTT file of kind=metadata to mark the intervals in which to do ducking. In both cases some JavaScript will be necessary.

  I received another question about how to do clean audio, which I had almost forgotten was a requirement from our earlier media accessibility document. “Clean audio” consists of isolating the audio channel containing the spoken dialog and important non-speech information that can then be amplified or otherwise modified, while other channels containing music or ambient sounds are attenuated. I suggested using the mediagroup attribute to provide a main video element (without an audio track) and then the other channels as parallel audio tracks that can be turned on and off and attenuated individually. There is some JavaScript coding involved on top of the APIs that we have defined in HTML, but it can be implemented in browsers that support the mediagroup attribute.

  Another question was about the possibilities to extend the list of @kind attribute values. I explained that right now we have a proposal for a new text track kind=”forced” so as to provide forced subtitles for sections of video with foreign language. These would be on when no other subtitle or caption tracks are activated. I also explained that if there is a need for application-specific text tracks, the kind=”metadata” would be the correct choice.

  I received some further questions, in particular about how to apply styling to captions (e.g. color changes to text) and about how closely the browser are able to keep synchronization across multiple media elements. The earlier was easily answered with the ::cue pseudo-element, but the latter is a quality of implementation feature, so I had to defer to individual browsers.

  Overall it was a good exercise to summarize the current state of HTML5 video accessibility and I was excited to show off support in Chrome for all the features that we designed into the standard.

• creating FFMPEG-based android apps with BAMBUSER

  22 novembre 2013, par Blaze Tama

  First, im a beginner in FFMPEG so please bear with me.

  And more, my java is not a "master", and i only have a very little experience in C.

  I interested in bambuser's ffmpeg library but theres still some doubt in my mind :

  1. Dont they have any step by step tutorial ? The only tutorial i found, which is good but not suitable for beginner is http://www.quora.com/What-are-the-steps-for-integrating-FFMPEG-on-Android#
  2. DO I HAVE TO CODE IN C ? Sorry this might be a stupid question..but ehm i dont really understand what im doing and where im going...LOL
     What i mean is, can i just use FFMPEG syntax like -i, -vf and run it inside my apps like in the ubuntu's terminal ?

  Im well aware that this question should not be suitable for SO, but i have no choice. I have tried to use many different lbraries, like GUARDIAN PROJECT (well, i have the UNSOLVED question here) but its not working like i hope.

  Thanks very much for your time, and your help. Please help me here, its alreay a month LOL :D