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• FFMPEG for iPhone recorded video encoding

  16 décembre 2011, par Sarah

  Hi found lots and lots of links for video encoding through ffmpeg 1,2,3,4 etc but they all start with using terminal commands but when i try to implement any on terminal like :

  git clone git ://github.com/lajos/iFrameExtractor.gitit says that-bash : git : command not found.

  Also as per my knowledge it is not possible to use terminal command on iPhone. Can anybody point out how to encode a video recorded through ffmpeg in mp4 format and also to reduce the size of the video ?Thanks in advance.

  EDIT :
  I am already implementing this method to resize my video and it successfully takes place and I am able to send the video on server but then on server side it's giving problem in retrieving the data and to use it.

  - (void)imagePickerController:(UIImagePickerController *)picker 
  
  didFinishPickingMediaWithInfo:(NSDictionary *)info
  
  {
  
      [self convertVideoToLowQuailtyWithInputURL:videoURL1 outputURL:[NSURL fileURLWithPath:videoStoragePath] handler:^(AVAssetExportSession *exportSession)
  
       {
  
           if (exportSession.status == AVAssetExportSessionStatusCompleted)
  
           {
  
               NSLog(@"%@",exportSession.error);
  
               printf("completed\n");
  
           }
  
           else
  
           {
  
               NSLog(@"%@",exportSession.error);
  
               printf("error\n");
  
           }
  
       }];
  
  }
  
  
  
  - (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL 
  
                                     outputURL:(NSURL*)outputURL 
  
                                       handler:(void (^)(AVAssetExportSession*))handler
  
  {
  
      [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
  
      AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
  
      AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality];
  
      exportSession.outputURL = outputURL;
  
      exportSession.outputFileType = AVFileTypeQuickTimeMovie;
  
      [exportSession exportAsynchronouslyWithCompletionHandler:^(void) 
  
       {
  
           handler(exportSession);
  
           [exportSession release];
  
       }];
  
  }

• ffmpeg : add hyperlink to video ?

  15 mars 2012, par Simon

  i am experiment with ffmpeg, making videos from more images and adding watermark, some effect etc.

  What I am interested : Is it possible to embed HYPERLINK into video using ffmpeg ?

  For example, watermark or something else to be 'clickable' and to redirect to some www location ?

• How to encode video using ffmpeg-java on Android from Bitmaps ?

  15 décembre 2011, par gtcompscientist

  I am using ffmpeg-java compiled for Android to encode/decode video for my application.

  The problem that I've run into is that I am currently getting each frame as a Bitmap (just a plain android.graphics.Bitmap) and I can't figure out how to stuff that into the encoder.

  Here is the code that I am using to instantiate all the ffmpeg libraries :

      AVCodecLibrary cLibrary = AVCodecLibrary.INSTANCE;
  
      cLibrary.avcodec_register_all();
  
      cLibrary.avcodec_init();
  
  
  
      AVFormatLibrary fLibrary = AVFormatLibrary.INSTANCE;
  
      fLibrary.av_register_all();
  
  
  
      //AVUtilLibrary uLibrary = AVUtilLibrary.INSTANCE;
  
      //uLibrary.av_malloc();
  
  
  
      AVCodec pCodec = cLibrary.avcodec_find_encoder(AVCodecLibrary.CODEC_ID_H263);
  
      if (pCodec == null)
  
      {
  
          Logging.Log("Unable to find codec.");
  
          return;
  
      }
  
      Logging.Log("Found codec.");
  
  
  
  
  
      AVCodecContext codecCtx = cLibrary.avcodec_alloc_context();
  
      codecCtx.bit_rate = 64000;
  
      codecCtx.coded_width = VIDEO_WIDTH;
  
      codecCtx.coded_height = VIDEO_HEIGHT;
  
      codecCtx.time_base = new AVRational(1, VIDEO_FPS);
  
      codecCtx.pix_fmt = AVCodecLibrary.PIX_FMT_YUV420P;
  
      codecCtx.codec_id = AVCodecLibrary.CODEC_ID_H263;
  
      //codecCtx.codec_type = AVMEDIA_TYPE_VIDEO;
  
  
  
      if (cLibrary.avcodec_open(codecCtx, pCodec) < 0)
  
      {
  
          Logging.Log("Unable to open codec.");
  
          return;
  
      }
  
      Logging.Log("Codec opened.");

  This is what I want to be able to execute next :

  cLibrary.avcodec_encode_video(codecCtx, pPointer, pFrame.size(), pFrame);

  But, as of now, I don't know how to put the Bitmap into the right piece or if I have that setup correctly.

  A few notes about the code :
  - VIDEO_WIDTH = 352
  - VIDEO_HEIGHT = 288
  - VIDEO_FPS = 30 ;
  - I'm unsure about how pPointer and pFrame are handled.