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• Live Streaming Using Red5 with H.265 Raw Imcoming Video

  27 décembre 2019, par minghua

  How do you stream a raw H.265 incoming video using Red5 ?

  I’ve seen this example to stream flv file, and this for the client side, and for H.264 with or without ffmpeg.

  Basically the question can be split into two :

  • How do you stream it from a .h265 file ? If from .265 file is not possible, how do you do it from a file that contains H.265 video ? Any example ?
  • How do you stream it from an incoming RTP session ? I can get the session UDP/RTP unpacked and decode into raw H.265 NAL packets. I’m assuming some conversion is needed, any libraries available for that purpose ? Examples ?

  If I can get an answer to the above first split question, I know I can redirect the incoming stream to a named pipe. That can be used as an indirect solution to the second split question. Streaming from the incoming UDP session directly is preferred, though.

• How to execute command line ffmpeg commands programatically in android ?

  14 août 2013, par Md. Arafat Al Mahmud

  I have successfully built ffmpeg for android using the bambuser
  . Now I have to build a sample converter application like mp4 to 3gp. I know there are command line commands ffmpeg -i video_origine.avi video_finale.mpg. But I don't know how to execute these commands programatically. I have sample code like

  jint Java_com_example_ndklearning1_MainActivity_logFileInfo(JNIEnv * env, jobject this, jstring filename)
  
  {
  
      av_register_all();
  
  
  
      AVFormatContext *pFormatCtx;
  
      const jbyte *str;
  
      str = (*env)->GetStringUTFChars(env, filename, NULL);
  
  
  
      if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
  
      {
  
          LOGE("Can't open file '%s'\n", str);
  
          return 1;
  
      }
  
      else
  
      {
  
          LOGI("File was opened\n");
  
          LOGI("File '%s', Codec %s",
  
              pFormatCtx->filename,
  
              pFormatCtx->iformat->name
  
          );
  
  
  
      }
  
      return 0;
  
  }

  This code open's a file and extracts the codec information. All I want is that, to convert the opened file in a desired format. Any kind of help such as code snippet or steps to follow will be highly appreciated.

  Can ffmpeg API serve my purpose ? If there is existing API available, it will be more helpful

• app file results error while executable runs alright on macos

  20 juin 2021, par newpy

  I made a python/kivy app in which I use subprocess running a ffmpeg command, then built it by pyinstaller successfully.

  


  Environment : MacOS 11.3.1, python 3.9.5, kivy 2.0, ffmpeg 4.4

  


  However, there are some running scenarios as follows :

  


  

  1. Start by double click executable file —> OK

  


  2. Start from terminal by : open myapp.app —> OK

  


  3. Start by double click myapp.app (or via Launchpad) —> ERROR

  


  


  About the error, I am pretty sure the error comes from the statement :

  


  process = subprocess.run(['ffmpeg', '-i', self.sound_file_path, self.tempdir.name + '/result.ogg'])


  


  because the error just disappears after is is commented out.
The statement purpose is just converting a mp3 file to ogg then save in temporary folder.
The problem is I just know that there is an error because other functions of the app cannot read the the ogg file which is expected to be present in temporary folder as a result of the above statement. I don't know where I can check what exactly the error is since, as aforementioned, both of the first 2 ways of starting do not generate errors.

  


  Coz not much experience in subprocess, I don't know where to start debugging for this error. Please show me what might be error here and how to debug it.