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• Frame loss while FFmpeg video splitting

  27 mai 2016, par Gurinderbeer Singh

  I am using ffmpeg to split the video file into multiple parts by following command. But there is frame loss.

     ffmpeg -i input.mp4 -ss 00:00:00 -t 00:10:00 -c copy output.mp4

  For example there are total 17983 frames in complete video file. But total number of frames combined in all the splitted parts is 17970. So there are 13 frames less.

  Can anyone please tell, if there is any method by which we can split the video without any frame loss. Even by using some other tool than ffmpeg.

  Thanks....

• how to merge an audio file with an image in android using javaCV

  11 mai 2016, par Darshan Soni

  I have aleady tried some code but it is throwing exception like this,

  05-11 17:34:00.449 1838-2316/darshan.fragments_demo E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
  
                                                                        Process: darshan.fragments_demo, PID: 1838
  
                                                                        java.lang.RuntimeException: An error occurred while executing doInBackground()
  
                                                                            at android.os.AsyncTask$3.done(AsyncTask.java:309)
  
                                                                            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
  
                                                                            at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
  
                                                                            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
  
                                                                            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
  
                                                                            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
  
                                                                            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
  
                                                                            at java.lang.Thread.run(Thread.java:818)
  
                                                                         Caused by: java.lang.UnsatisfiedLinkError: org.bytedeco.javacpp.avutil
  
                                                                            at java.lang.Class.classForName(Native Method)
  
                                                                            at java.lang.Class.forName(Class.java:324)
  
                                                                            at org.bytedeco.javacpp.Loader.load(Loader.java:413)
  
                                                                            at org.bytedeco.javacpp.Loader.load(Loader.java:381)
  
                                                                            at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2597)
  
                                                                            at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:386)
  
                                                                            at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:380)
  
                                                                            at darshan.fragments_demo.Layout1$Test.doInBackground(Layout1.java:166)
  
                                                                            at darshan.fragments_demo.Layout1$Test.doInBackground(Layout1.java:136)
  
                                                                            at android.os.AsyncTask$2.call(AsyncTask.java:295)
  
                                                                            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  
                                                                            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
  
                                                                            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
  
                                                                            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
  
                                                                            at java.lang.Thread.run(Thread.java:818)
  
  </clinit>

   
  Now in gradle file I’ve included some libraries my gradle file is as follow,

  apply plugin: 'com.android.application'
  
  
  
  android {
  
      compileSdkVersion 23
  
      buildToolsVersion "23.0.2"
  
  
  
          packagingOptions {
  
              exclude 'META-INF/LICENSE'
  
              exclude 'META-INF/LICENSE-FIREBASE.txt'
  
              exclude 'META-INF/NOTICE'
  
              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'
  
  
  
          }
  
  
  
  
  
      defaultConfig {
  
          applicationId "darshan.fragments_demo"
  
          minSdkVersion 16
  
          targetSdkVersion 23
  
          versionCode 1
  
          versionName "1.0"
  
      }
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      testCompile 'junit:junit:4.12'
  
  
  
      compile 'com.android.support:appcompat-v7:23.1.1'
  
      compile 'com.android.support:design:23.1.1'
  
      compile group: 'org.bytedeco', name: 'javacv', version: '1.1'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '2.4.11-0.11', classifier: 'android-arm'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'opencv', version: '2.4.11-0.11', classifier: 'android-x86'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '2.6.1-0.11', classifier: 'android-arm'
  
      compile group: 'org.bytedeco.javacpp-presets', name: 'ffmpeg', version: '2.6.1-0.11', classifier: 'android-x86'
  
  
  
  
  
  }

  And java file is as follow,

  public class Test extends AsyncTask {
  
  
  
      ProgressDialog dialog;
  
      FFmpegFrameRecorder recorder;
  
      String videoPath;
  
      protected void onPreExecute() {
  
          dialog = new ProgressDialog(Layout1.this);
  
          dialog.setMessage("Genrating video, Please wait.........");
  
          dialog.setCancelable(false);
  
          //dialog.show();
  
      };
  
      @Override
  
      protected Void doInBackground(Void... params) {
  
  
  
          File folder = Environment.getExternalStorageDirectory();
  
          String path = folder.getAbsolutePath() + "/DCIM/Camera";
  
          // ArrayList<string> paths = (ArrayList<string>) getListOfFiles(path, "jpg");
  
          long millis = System.currentTimeMillis();
  
          videoPath = path + "/" + "test_sham_"+millis+".3gp";
  
  
  
          try {
  
  
  
  
  
  
  
              //audio grabber
  
  
  
              FFmpegFrameGrabber grabber2 = new FFmpegFrameGrabber(folder.getAbsolutePath()+"/bluetooth/abcd.mp3");
  
  
  
              //video grabber
  
              FFmpegFrameGrabber grabber1 = new FFmpegFrameGrabber(path+"/1.jpg");
  
              grabber1.start();
  
  
  
              grabber2.start();
  
  
  
              recorder = new FFmpegFrameRecorder(path
  
                      + "/" + "test_sham_"+millis+".mp4",  grabber1.getImageWidth(), grabber1.getImageHeight(),2);
  
  
  
              //recorder.setVideoCodec(5);
  
              recorder.setVideoCodec(avcodec.AV_CODEC_ID_MPEG4);
  
              // recorder.setVideoCodec(avcodec.AV_CODEC_ID_MP4ALS);
  
  
  
              //recorder.setFormat("3gp");
  
                recorder.setFormat("mp4");
  
              recorder.setFrameRate(30);
  
              recorder.setSampleRate(grabber2.getSampleRate());
  
              recorder.setVideoBitrate(30);
  
              long startTime = System.currentTimeMillis();
  
              recorder.start();
  
  
  
              Frame frame1, frame2 = null;
  
  
  
              while ((frame1 = grabber1.grabFrame()) != null ||
  
  
  
                      (frame2 = grabber2.grabFrame()) != null) {
  
  
  
                  recorder.record(frame1);
  
  
  
                  recorder.record(frame2);
  
  
  
              }
  
  
  
              recorder.stop();
  
  
  
              grabber1.stop();
  
  
  
              grabber2.stop();
  
  
  
  
  
  
  
  
  
              System.out.println("Total Time:- " + recorder.getTimestamp());
  
  
  
          } catch (Exception e) {
  
              e.printStackTrace();
  
          }
  
  
  
          return null;
  
      }
  
  }
  
  </string></string>

  I just cant figure out what is wrong with the implementation
  Please help

• yet another screenshot encoding exercise with ffmpeg - stuck at getting AVFrame from ALT::CImage - VC++

  11 septembre 2013, par sith

  Total AV newbee here - trying to learn the ropes on using FFMpeg functions to encode movies. On searching for tutorials I found a few similar questions that I have linked here for reference :

  Encoding a screenshot into a video using FFMPEG

  [Libav-user] Encoding a screenshot into a video using FFMPEG

  Save bitmap to video (libavcodec ffmpeg)

  When converting from RGB to YUV using ffmpeg the video file the color is spread why ?

  How to convert RGB from YUV420p for ffmpeg encoder ?

  Encode bmp sequence with libavcodec...Help !

  Not able to encode image with ffmpeg

  For my setup FFMPEG is on VS12 - VC++ with MFC on win7.

  With the help of above samples, I am able to get "some" output from the encoder, but I am not sure in what format or state the output has been encoded. Neither VLC nor WMP can play this file. It does not even seem to recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [1]

  Here is the flow of my code :

  Step1 : capture desktop on to a CImg :

  int W=GetSystemMetrics(SM_CXSCREEN), H=GetSystemMetrics(SM_CYSCREEN), bpp=24; 
  
  CImage cImg; cImg.Create(W,H,bpp) 
  
  HDC hDC = cImg.GetDC(); 
  
  CWindowDC winDC(GetDesktopWindow()); 
  
  
  
  BitBlt(hDC, 0,0, rez.W(), rez.H(), winDC.m_hDC, 0, 0, SRCCOPY);

  At this point I am able to dump a screen shot into a bmp file -
  using cImg.Save( _T("test.bmp"), Gdiplus::ImageFormatBMP) ;

  Step2 : Extract the BMP bits from the CImg.

  HBITMAP hBitmap = (HBITMAP)cImg;
  
  HDC memDC = CreateCompatibleDC(NULL);
  
  SelectObject( memDC, hBitmap );
  
  
  
  BITMAPINFO bmi; // initialized bmi with {W,-H, plane=1, bitCount=24, comp=BI_RGB, size=W*H*3 }
  
  << removed bmi init code for conciseness. >>>
  
  
  
  BYTE *rgb24Data = new BYTE[W*H*3]; // 3 for 24bpp. 4 for 32...
  
  int ret = GetDIBits(memDC, hBitmap, 0, H, rgb24Data, &bmi, DIB_RGB_COLORS);

  At this point I faithfully believe rgb24Data points to pixel data :) - copied out of the cImg bitmap

  Step 3 : next I try to create an AV frame with the rgb24Data got from this CImg. Also this is where I have a massive knowledge gap. I am going to try and recover

  // setup the codecs and contexts here as per mohM's post
  
  
  
  AVCodec *currCodec = avcodec_find_encoder(CODEC_ID_MPEG4);
  
  
  
  AVCodecContext *codeCtxt = avcodec_alloc_context();  // init this with bate=400k, W, H,
  
  << removed codeCtxt init code for conciseness. >>>   //  time base 1/25, gop=10, max_b=1, fmt=YUV420
  
  
  
  avcodec_open(codeCtxt, currCodec);
  
  
  
  SwsContext *currSWSCtxt = sws_getContext( W, H, AV_PIX_FMT_RGB24, // FROM
  
                                            W, H, AV_PIX_FMT_YUV420P, // TO
  
                                            SWS_FAST_BILINEAR,
  
                                            NULL, NULL, NULL);
  
  
  
  // allocate and fill AVFrame
  
  int numBytes = avpicture_get_size(PIX_FMT_YUV420P, W, H);
  
  uint8_t *buffer=new uint8_t[numBytes];
  
  AVFrame *avFrame = avcodec_alloc_frame();
  
  avpicture_fill( (AVPicture*)avFrame, buffer, PIX_FMT_YUV420P, W, H );

  Step 4 : transform the data frame into YUV420P as we fill the frame.

  uint8_t * inData[1] = { rgb24Data };
  
  int inLinesize[1] = { 3*W }; // RGB stride
  
  sws_scale( currSWSCtxt, inData, inLinesize, 0, H,
  
             avFrame->data, avFrame->linesize);

  step 5 encode the frame and write out the output buffer into a file.

  int out_size = avcodec_encode_video( codeCtxt,
  
                                       outBuf,
  
                                       outBufSize,
  
                                       avFrame );
  
  
  
  fwrite(outBuf, 1, outBufSize, outFile );

  finally I close the file off with [0x00 0x00 0x01 0xb7]

  The first hint of things gone haywire is that for a 50 screens of 1920X1080 at 24bpp encoded at 25fps gives me a 507MB unplayable-mpeg file.

  As mentioned earlier, neither VLC nor WMP can play this file nor they even recognize the metadata in the file to display the FPS or video length. What would normally cause that ? Also any pointers on what could be going wrong and how to approach fixing the problems would be great. [2]

  Any guidance is much appreciated.