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• Using Python to make a terminal-based YouTube audio streamer

  11 août 2015, par Tyson Berry

  I want to make a terminal-based program that streams YouTube audio for easy listening to music. I’m aware that I’d have to use a converter like ffmpeg to extract the mp3 audio and an audio player like Foobar2000, I’m just unsure how to make it all work together.

  I have an idea for commands etc which is here. (Excuse my crude use of MS Paint)

  As you can see yap (YouTube Audio Player, a working title) is the command used in front of a YouTube URL to tell the program what video to fetch. It then fetches the title of the video from the YouTube page’s source, which is listed in a text file on the desktop along with the URL. The song is then loaded and played through the audio player which is displayed in the terminal using the song time. When the song has ended, you can see the user has typed list. List opens up the list on the desktop, which displays all the songs previously entered in the program. The user can then select a number and play the corresponding song from the list.

  I have found this, which is outdated yet relevant.

• 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

• Video processing / playback with alpha channel in C# or C++ [closed]

  2 avril 2013, par Corylulu

  WHAT I'M AFTER

  I've been exploring the best ways to do this, but seem to keep running into hiccups when trying to playback video and then grab the frame with an alpha channel (ARGB) to then be further manipulated.

  I've gotten everything to work with AForge to then find out that the Alpha gets stripped out during the process. I considered OpenCV, but the Emgu CV has a different license that I can't use and I can't verify that OpenCV can read Alpha channels as well.

  I looked into FFMPEG .NET wrappers, but haven't found any that are out of their alpha phase or have a license I can use them with (since this could be used for commercial purposes and can't be open sourced)

  So I'm looking for a library that is preferably C# or C++ that can play a .MOV or .AVI while preserving it's alpha channel when I make it into a Bitmap.

  SUMMARY [TL ;DR]

  I'm looking for library / sample code

  • Written preferably in C#, C++ as a fallback. Hopefully easy enough to use.
  • Can playback AVI and MOV files
  • Will preserve the alpha channel
  • Will allow me to access each frame's ARGB values directly
  • Preferably something that uses the FFMPEG library since it's able to read most formats I need