Recherche avancée

Sur d’autres sites (15334)

• How the seek frame while playing video ?

  16 mars 2012, par sherman

  I try do this :

  void Java_ffvideo_company_com_NativeCalls_seekFrame(
  
          JNIEnv *env, jobject this, jint time) {
  
  
  
  
  
      if (avformat_seek_file(pFormatCtx, videoStream, 0,time,time, AVSEEK_FLAG_ANY) < 0)
  
          __android_log_print(ANDROID_LOG_DEBUG, "ERROR SEEK->>>",
  
                  "av_seek_frame failed.");
  
  
  
      avcodec_flush_buffers(pCodecCtx);
  
  }

  But the application crashes. Without avcodec_flush_buffers video seeking not correctly. How I can resolve this isssue ?

• Need to get audio video structure for automation ffmpeg or ffprobe

  10 mai 2012, par Sapan Doshi

  I need to get video audio stream information in separate form.

  I have tried ffprobe and mediainfo, but they give full information which needs to be parsed.

  I think there could be option like, where I do not need to parse the full information and get required data.

  $ffprobe -XXX
  audio channels 8

  $ffprobe -YYY
  video_resolution 512x288

  Can anybody help with this.

• 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.