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• Running an Terminal command inside a Directory

  22 janvier 2014, par user3220153

  I want to run and tell ffmpeg, a video converter, to combine an audio and video file to one video file. I want to do this in terminal so I can do this repeatedly and quickly.

  This works in Terminal :

  [directoryX]/ ffmpeg -i [directoryX]/sound.wav -i [directoryX]/movie.avi video_finale.mpg
  Pause

  But I do NOT want to keep specifying the directory in Terminal because there are many folders in which I need to do this. I would like to create a .command file, copy it and the ffmpeg application (very small), and past it in every folder that needs a video conversion. I would then run the .command file and it would execute the command mentioned above in the local folder. What is the best way to approach this ???

  This line in .command file does NOT work (inside the folder with ffmpeg, audio and video) :

  ffmpeg -i sound.wav -i movie.avi video_finale.mpg
  Pause

  I get :

  wireless-10-146-122-30:~ yagostucky$ /Volumes/TURBOLINEA/inFrontOfMe/footage/jan-19-2014/dollGhost_duke_act1_scene3_take1/batch.command ; exit;
  
  /Volumes/TURBOLINEA/inFrontOfMe/footage/jan-19-2014/dollGhost_duke_act1_scene3_take1/batch.command: line 1: ffmpeg: command not found
  
  /Volumes/TURBOLINEA/inFrontOfMe/footage/jan-19-2014/dollGhost_duke_act1_scene3_take1/batch.command: line 2: pause: command not found
  
  logout
  
  
  
  [Process completed]

• Publish audio to an RTMP server for real time live streaming in C or C++

  19 mai 2021, par Antenaina

  I want to publish audio stream to an RTMP server, for real time audio live streaming, from mobile device (with Android for example).
  
Suppose the mobile device has a way to yield to me those datas in real time (ex : using Oboe library). Packet by packet (a packet contains a certain number of audio frames).
  
When live streaming, there are some really custom computations to those datas that requires that I must send then little by little (packet by packet ?) to the RTMP server.
  
I'm trying to use FFMPEG for that purpose, and have similar problem with this thread's question : How to publish self made stream with ffmpeg and c++ to rtmp server ?. But the answer there is not detailed is not enough for me.
  
I tried reading FFMPEG code source, with the help of the documentation, but there are still some challenges I must face since I'm new to the streaming domain. What I need to know is :

  


  

  • How to properly configure FFMPEG for that purpose ? (AVFormatContext ?)

  


  • What is the proper way to write the stream (AVStream) ? (I read somewhere that the packet needs to be of a specific size, and other stuffs too)

  


  


  For simplicity :

  


  

  • I can handle the audio packet by packet and encoded.

  


  • Audio is encoded as mp3.

  


  • Audio has default sample rate of 44100 Hz, 320kb/s bitrate and some other details already known so that FFMPEG doesn't need to guess it.

  


  


  Further informations :
  
I'm using react-native. For android : native modules to communicate with Java, JNI to communicate Java with C++, Oboe to record and play audio. For iOS : not a problem for the moment.
  
I use node-media-server as RTMP server.
  
Thanks !

  


• Android : How to trim WAV audio programmatically in API 30 ?

  26 mai 2021, par Andrea Zaffanella

  I need to be able trim wav audio files for an application I'm building.. but I have several problems.
I tried using FFmpeg-android, but if you target the latest SDK, and in the future, android no longer allows using "FFmpeg.execute". I also tried with the newer mobile-FFmpeg, but the developer stopped maintaining it a few months ago... I also would like to avoid heavy frameworks to also work with video, since I only need to work with audio. I can't find answers anywhere, what am I supposed to do ?