Recherche avancée

Sur d’autres sites (7595)

• Live video streaming with Node js ,HTML5, MPEG-DASH, FFMPEG and IP camera/Raspberry Pi

  12 mai 2016, par sparks

  I am a programmer but i am very new in live video streaming concepts.I need help

  What i want to accomplish

  I want to develop an online live video streaming system.The scenario is i would have a device or number of devices(raspberry pi & camera only OR ip camera only ...not sure yet) to capture the video and stream the video live in real time remotely to my web app.Multiple clients can connect to the web app and watch the video live.The key things to note here, is that these devices should be wireless(able to connect to internet and live stream the content) and also i want to eliminate the idea of manually configuring the ip adrress to local WIFI router.So simply i turn on the device and it start streaming right away to the web app.

  Infrastructure, Platforms,Browsers, Streaming methods and formats

  In the beginning i just want to stream though chrome web browser(that’s all i care about).But in the future i would build android and IOS mobile apps.So long term i would expect to be Chrome and mobile(Android & IOS platforms)
  So based on my research i learned that the client should be HTML5, streaming method MPEG-DASH(In the future add HLS), the web app will be in Node Js.I also came across Dash.js for Html5.

  My understanding of streaming based on my research

  I also came across things like FFMPEG,Dash encoder and wowza which i am not clear about.Now correct me if i am wrong, my understanding is that FFMPEG get hold of the device/camera and the content(i am not sure the format of the content at this point)and format it(i am not sure what this means in simple english) and then Dash encoder picks up and re-format the content to MPEG-DASH format, which produces MPD and then Dash.js client uses MPD to display the video to the browser.

  QUESTIONS

  1. First correct me if i am wrong based on my understanding above or
     clarify for me.Also I am not sure of where the wowza streaming
     engine come into play. Do i even need it ?

  2. I am not sure of the devices to use between Raspberry pi with camera
     module/ Or IP Wifi camera by itself.I know with raspberry pi
     connected to internet you can set up all the necessary programs and
     stream the video to web app directly(not sure about quality and
     performance) but I am not sure about Wifi camera.Is it possible to
     connect to the wifi camera remotely from the web app programatically
     without opening the wifi router portal manually or i should stick
     with Raspbery Pi ?

  3. For raspberry Pi would i be able to connect it with high quality
     picture IP camera/web cam ? (The point here to get the best picture
     through raspbery Pi)

     My expectations

     Better performance and quality would be great.But i know live streaming is not easy so i am willing to compromise performance to a point but not quality.

  Thank you in advance, Anything will be appreciated.I know this is a lot so take your time :)

• FFmpegMediaPlayer Stops When Network is Turned Off and Back On

  18 mai 2017, par Fallas

  I am currently working with FFmpegMediaPlayer in order to make a basic music player given a url. I got the basic functionality to work. On error, I show an error message, else I play the songs.
  The problem I am facing is, once the player starts, and I turn off my wifi and phone data, it stops the sound. Once I turn my wifi or phone data back one, I would like the player to continue but it simply stops. I have to stop and play again for it to continue.

  Is there a way to have the FFmpegMediaPlayer continue streaming ?

  This is what I have to initialize the player :

  mMediaPlayer = new FFmpegMediaPlayer();
  
      mMediaPlayer.setOnErrorListener(this);
  
      mMediaPlayer.setOnPreparedListener(this);
  
      mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  
      mMediaPlayer.setOnBufferingUpdateListener(this);
  
      mMediaPlayer.setOnSeekCompleteListener(this);
  
  
  
      try {
  
          Uri uri = Uri.parse(radio_url);
  
          mMediaPlayer.setDataSource(mMainActivity, uri);
  
          mMediaPlayer.prepareAsync();
  
      } catch (IllegalArgumentException e) {
  
          e.printStackTrace();
  
      } catch (SecurityException e) {
  
          e.printStackTrace();
  
      } catch (IllegalStateException e) {
  
          e.printStackTrace();
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      }

  Then I have a function to handle when Play/Stop button is clicked :

  @Override
  
  public void onPlayButtonClicked(Button button) {
  
  
  
      if (radioInitialized) {
  
          mAnalytics.onStopButtonClicked();
  
          mMainLayout.loading(false);
  
          mMediaPlayer.pause();
  
       button.setBackground(mMainActivity.getResources().getDrawable(R.drawable.play_button));
  
          radioInitialized = false;
  
      } else {
  
          mAnalytics.onPlayButtonClicked();
  
          mMainLayout.loading(true);
  
          initRadio();
  
          button.setBackground(mMainActivity.getResources().getDrawable(R.drawable.stop_button));
  
          radioInitialized = true;
  
      }
  
  }

  Again, the basic functionality works, but I would like for it to continue streaming after wifi is turned back on.

• Video Processing via Bluetooth

  16 juillet 2012, par kerim yucel

  The application I am currently developing processes each frames using a native code and it should record the video as well. I tried SDK for this purpose but certain restrictions didn't allow me to do so, so I switched to NDK for a video recording code piece.

  Apparently, my algorithm seriously uses CPU, upto %70 percent in the worst case. Before I actually start working on a video recorder, I wanted to try the following approach.

  I will process the preview frames using an android phone and send it to another phone (which uses same application and same model) for recording. My questions are :

  1.Should I try WiFi instead of Bluetooth ? I am developing the application for API 8 so I don't have WiFi-Direct, therefore I should do some socket programming, which would possibly complicate things a bit for me since Bluetooth can easily be set up using SDK.

  2- Will I be available to record the frames as a video at the receiving end ? I will receive each frame with certain metadata embedded to it and should record them using the other phone. I doubt I will be able to do it using SDK, so NDK along with ffmpeg seems to be the best choice ? Any suggestions related to this question will be more than welcome.

  3-Here comes the best part. I am recording the video with the lowest resolution that,after compressed, takes no more than 14mb space for a 10 minute long video. I have to reach the raw frames to send it to other end, encode and compress it. Any ideas related to possible flooding of Bluetooth/Wi-Fi because of big-sized raw frames ?

  Any other approaches and answers will be much appreciated. Thanks.