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• Play Multiple online videos in FFMPEG

  4 juillet 2014, par AndroidOptimist

  I’m trying to make an Android Applicaion that uses FFMPEG to play online streams. I gone through dolphin player source and with the help of this i achieved playing udp streams in android. Now i am trying to play multiple streams in my player. For example i have a list activity that has 10 names and by clicking each name the corrosponding video should be played. How can i achieve this in avformat_open_input. I am very new to ffmpeg. Please help me in achiving this. Thanks in advance.

  My c code is as follows :

  static int decode_module_init(void *arg) 
  
  {
  
      VideoState *is = (VideoState *)arg;
  
      AVFormatContext *pFormatCtx;
  
  
  
      int err;
  
      int ret = -1;
  
  
  
      int i;
  
  
  
      int video_index = -1;
  
      int audio_index = -1;
  
  
  
  
  
      is->videoStream=-1;
  
      is->audioStream=-1;
  
  
  
      char* Filename = "udp://.....";
  
  
  
      global_video_state = is;
  
  
  
      pFormatCtx = avformat_alloc_context();
  
      pFormatCtx->interrupt_callback.callback = decode_interrupt_cb;
  
      pFormatCtx->interrupt_callback.opaque = is;
  
  
  
  
  
      **err = avformat_open_input(&pFormatCtx, Filename , NULL, NULL);**
  
  
  
      if (err < 0) {
  
          __android_log_print(ANDROID_LOG_INFO, "message", "File open failed");
  
          ret = -1;
  
          goto decode_module_init_fail;
  
  
  
      }
  
  
  
      __android_log_print(ANDROID_LOG_INFO, "message", "File open successful");
  
  }

• Is possible to make watermark film with libav without decoding full video ?

  2 août 2018, par hawk.hsieh

  Ther is a small png image and a video film.
  I want to overlay this png image into video film and I did it by libavcodec.
  The CPU loading of this overlay process is extermely high.
  To reduce the performance impact, I have the png overlaid in 10 seconds and then copy stream from old file to new ones after 10 seconds.
  The problem is, the video is ok before 10 seconds with png overlaid video.
  After 10 seconds, the video is stalled and begin to show abnormal green block at top of the screen.
  I figure out the spspps maybe different between the original stream and the transcoded stream. Is this a root to cause the video stalled after 10 seconds ?

  Thank you.

• ffmpeg make film look wet

  29 juillet 2018, par theonlygusti

  How can I make something look like it’s really wet ?

  I have a video of some food and I want to make it look shiny/moist/glistening.

  Can ffmpeg do this ?

  I don’t think iMovie can, I looked through all the video filters.

  I looked at this ffmpeg documentation because it showed up for a google search with "wet" and "ffmpeg", but I don’t know what "wet gain" is.