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• Recording Video and Voice at the same time to .mp4 on raspbarry pi

  18 juin 2014, par SunBae Yim

  I tried for 3 months, But can’t resolved it.
  on Raspberry Pi.

  I want to recording video and voice to mp4, And Realtime streaming(Mjpeg) no delay.

  Of course, It has Pi Camera Module.
  And I installed a soundcard as below.

  pi@raspberrypi ~ $ aplay -l
  
  **** List of PLAYBACK Hardware Devices ****
  
  card 0: sndrpiproto [snd_rpi_proto], device 0: WM8731 HiFi wm8731-hifi-0 []
  
    Subdevices: 1/1
  
    Subdevice #0: subdevice #0

  First Goal is :

  Recording voice(aac or mp3) and video(h264) at the same time to .mp4.
  h264 and aac are combined into mp4 container.
  I failed make it using ffmpeg. too difficult.

  Sencond Goal is :

  Realtime Streaming for MJPEG.
  I receive stream using Safari, Chrome, FireFox, Explorer on Windows & Android.
  And using IP CAM VIEWER of Android App.

  I tried various solution,
  But most solutions are only video no voice.

  Third Goal is :

  Above Functions are run at the same time on Raspberry Pi.
  Maybe I will make Python and Shell Scripts files for run above solution at the same time.

  Please Help me !

  Thanks,
  SB YIM

• How to detect when a mp3 stops playing in ffmpeg

  23 mai 2021, par Jacob Shankman

  back yet again to ask this : I have a ost command for my discord bot. All it does is join the vc that the user is in, and plays a random choice of mp3's that I have as a list. It works fine. Except for when the song is over, it just stays there. Im wondering how to detect when ffmpeg has finished playing the mp3 so
I can execute a function to tell the bot to disconnect once it has finished. Here is the code for the command :

  


  @client.command()
async def speak(message):
    voice_s = await message.author.voice.channel.connect()
    voice_s.play(discord.FFmpegPCMAudio(random.choice(speak_list)))


  


• Convert frames to video on demand

  29 janvier 2020, par user3900456

  I’m working on a c++ project that generates frames to be converted to a video later.
  The project currently dumps all frames as jpg or png files in a folder and then I run ffmpeg manually to generate a mp4 video file.

  This project runs on a web server and an ios/android app (under development) will call this web server to have the video generated and downloaded.

  The web service is pretty much done and working fine.

  I don’t like this approach for obvious reasons like a server dependency, cost etc...
  I successfully created a POC that exposes the frame generator lib to android and I got it to save the frames in a folder, my next step now is to convert it to video. I considered using any ffmpeg for android/ios lib and just call it when the frames are done.

  Although it seems like I fixed half of the problem, I found a new one which is... each frame depending on the configuration could end up having 200kb+ in size, so depending on the amount of frames, it will take a lot of space from the user’s device.
  I’m sure this will become a huge problem very easily.

  So I believe that the ideal solution would be to generate the mp4 file on demand as each frame is created, so in the end there would be no storage space being taken as I woudn’t need to save a file for the frame.

  The problem is that I don’t know how to do that, I don’t know much about ffmpeg, I know it’s open source but I have no idea how to include a reference to it from the frames generator and generate the video "on demand".
  I heard about libav as well but again, same problem...

  I would really appreciate any sugestion on how to do it. What I need is basically a way to generate a mp4 video file given a list of frames.

  thanks for any help !