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• I am a newbie in FFmpeg and I am trying to use FFMPEG to play RTSP stream on Android, but it will play slower and slower

  8 mai 2020, par Ajax

  I am a newbie in FFmpeg and I am trying to use FFMPEG to play RTSP stream on Android, but it will play slower and slower. The picture of my player and video source will increase with the time difference. The video are not synchronized. I'm pulling on the local area network。
The longer it is played, the more the picture of the video source will be. The more it cannot automatically return to the real-time picture like MediaCode's hardware decoding.The decoded picture is in slow motion, and it will freeze after a while.。What causes this ? How can i optimize it。
this is my code

  



  2020-5-8/Problem has been solved

  


• mp4 video file generated using ffmpeg, play on desktop but doesn't play on device

  9 mai 2014, par Nikesh

  I am generating a video that converts images into .mp4 video file. Every thing works fine. File is also generated as mp4 but the file doesn’t run on android device, says cannot play video.

  Please find the attached sample code which convert single jpeg file into video (.mp4)

  Please help me to resolve this issue. Thanks.

  JNIEXPORT void JNICALL Java_roman10_ffmpegtst_VideoBrowser_videoExample(JNIEnv *pEnv, jobject pObj, char* imagefile,char* videoFile)
  
  {
  
  avcodec_init();
  
  av_register_all();
  
  avcodec_register_all();
  
  
  
  AVCodecContext          *pOCtx= NULL;
  
  AVCodec                 *pOCodex = NULL;
  
  LOGE(10,"Start videoExample");
  
  pOCodex = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
  
  
  
  if (!pOCodex) {
  
      LOGE(10,"Cannot find encoder %s", pOCodex);
  
      exit(1);
  
  }
  
  
  
  pOCtx= avcodec_alloc_context3(pOCodex);
  
  
  
  uint8_t *outbuf;
  
  int i, out_size;
  
  
  
  pOCtx->bit_rate = 400000;
  
  pOCtx->width = 640;
  
  pOCtx->height = 480;
  
  AVRational rational = {1,25};
  
  pOCtx->time_base= rational;
  
  pOCtx->gop_size = 10; /* emit one intra frame every ten frames */
  
  pOCtx->max_b_frames=1;
  
  pOCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  LOGE(10,"Start avcodec_open2");
  
  int ret = avcodec_open2(pOCtx,pOCodex,NULL);
  
  if(ret < 0)
  
  {
  
       return;
  
  }
  
  LOGE(10,"End avcodec_open2");
  
  AVFormatContext         *pIFormatCtx = NULL;
  
   ret = avformat_open_input(&pIFormatCtx, imagefile, NULL, NULL);
  
  if(ret < 0)
  
  {
  
      //Cant't open jpg file
  
      return;
  
  }
  
  av_dump_format(pIFormatCtx, 0, imagefile, 0);
  
  
  
  AVCodecContext          *pICodecCtx;  //output codec context
  
  pICodecCtx = pIFormatCtx->streams[0]->codec;
  
  /*pICodecCtx->width = 640;
  
  pICodecCtx->height = 480;
  
  pICodecCtx->pix_fmt = PIX_FMT_YUV420P;*/
  
  
  
  
  
  AVCodec *pICodec = avcodec_find_decoder(pICodecCtx->codec_id); //output codec
  
   // Open codec
  
  ret = avcodec_open2(pICodecCtx, pICodec,NULL);
  
  if(ret < 0)
  
  {
  
      //Can't find the decoder
  
      return;
  
  }
  
  
  
  AVFrame *pIFrame = avcodec_alloc_frame();
  
  if (!pIFrame)
  
  {
  
      //Can't alloc the input frame
  
      return ;
  
  }
  
  
  
  
  
  int bufSize = avpicture_get_size(AV_PIX_FMT_YUVJ420P, pICodecCtx->width, pICodecCtx->height);
  
  uint8_t *buffer = (uint8_t *) av_malloc(bufSize * sizeof(uint8_t));
  
  
  
  avpicture_fill((AVPicture *) pIFrame, buffer, AV_PIX_FMT_YUVJ420P, pICodecCtx->width, pICodecCtx->height);
  
  
  
  FILE *outputFile;
  
  
  
  outputFile = fopen(videoFile, "w+");
  
  if (!outputFile) {
  
      LOGE(10,"could not open ");
  
      exit(1);
  
  }
  
  
  
  int outbuf_size = 100000;
  
  outbuf = (uint8_t*)malloc(outbuf_size);
  
  
  
  AVPacket packet;
  
  int frameFinished;
  
  int framesNumber = 0;
  
  while (av_read_frame(pIFormatCtx, &packet) >= 0)
  
  {
  
      if(packet.stream_index != 0)
  
          continue;
  
  
  
      ret = avcodec_decode_video2(pICodecCtx, pIFrame, &frameFinished, &packet);
  
      if (ret > 0)
  
      {
  
          pIFrame->quality = 4;
  
  
  
          for(i=0;i<25;i++) {
  
              fflush(stdout);
  
              /* encode the image */
  
              out_size = avcodec_encode_video(pOCtx, outbuf, outbuf_size, pIFrame);
  
              fwrite(outbuf, 1, out_size, outputFile);
  
          }
  
      }
  
  }
  
  
  
  /* get the delayed frames */
  
  for(; out_size; i++) {
  
      fflush(stdout);
  
      out_size = avcodec_encode_video(pOCtx, outbuf, outbuf_size, NULL);
  
      fwrite(outbuf, 1, out_size, outputFile);
  
  }
  
  
  
  /* add sequence end code to have a real mpeg file */
  
  outbuf[0] = 0x00;
  
  outbuf[1] = 0x00;
  
  outbuf[2] = 0x01;
  
  outbuf[3] = 0xb7;
  
  fwrite(outbuf, 1, 4, outputFile);
  
  fclose(outputFile);
  
  free(outbuf);
  
  
  
  avcodec_close(pOCtx);
  
  av_free(pOCtx);
  
  av_free(pIFrame);
  
  }

• Revision 37408 : déplacement de chaines de langue Faire refonctionner l’encodage sonore

  18 avril 2010, par kent1@… — Log

  déplacement de chaines de langue
  Faire refonctionner l’encodage sonore