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• Youtube livestream stops receiving video from time to time (ffmpeg)

  15 December 2020, by wht_5005

  I have ip cam, raspberry pi (Ubuntu 18.04.4 LTS (GNU/Linux 5.3.0-1036-raspi2 armv7l)) with ffmpeg (3.4.8-0ubuntu0.2) on board and I am trying to do 24/7 youtube livestream.
I have set up a service that start ffmpeg on boot. It receives rtsp stream from camera and sends it to youtube. Here is the ffmpeg setup:

  


  ffmpeg -thread_queue_size 512 -rtsp_transport tcp -i rtsp://cam_address -c:v copy -af "aresample=async=1:first_pts=0" -c:a aac -ac 2 -ar 44100 -fflags +genpts -f flv rtmp://youtube_address -nostdin -nostats


  


  I have noticed that ffmpeg may accidentally stop working from time to time (rather rarely but still) so the service should restart if ffmpeg crashes. Additionally just in case I have set up a cron job that restarts the service every hour, so if it stops working for some reason and that magic that should bring it up fails it should still get up within an hour.

  


  What bothers me, sometimes it stops working but in an unusual way. The service on raspberry pi is running, ffmpeg is running as well, nethogs shows that ffmpeg is both receiving and sending proper amount of data. Stream status on youtube is all right as if everything was just fine but there is no video there (it looks as if it was still loading/buffering but it is not). Restarting the service does not make it work. However if I stop the service, wait a few seconds and start it again the youtube stream starts working as it is supposed to.

  


  Why such things happen and how can I fix it?

  


• YouTube coding parameters [closed]

  13 May 2013, by Tim N

  I am trying to find the transcoding parameters to apply to a video to avoid recoding after upload.
  Currently the best google seems to offer is lots of info on the API, and a 404 when it comes to the actual content itself.

• correct way to download a mp4 [Audio only] file as a mp3 file via php

  3 February 2018, by Kapil

  I am asking this question because i found it impossible as far my knowledge stands. However i believe here on stackoverflow a lot of genius persons visits so maybe someone can give a good advice / trick.

  My problem is, I am downloading a audio/mp4 file of youtube hosted on googlevideo.com’s server.

  My PHP code for this purpose:
  $mp3path is url of video

  header('Content-Description: File Transfer');
  
  if(strpos($mp3path, "https://") === false) {
  
      header('Content-length: ' . size($mp3path)); //size is custom function
  
  } 
  
      header("Content-Type: audio/MP4A-LATM, audio/MP4A, audio/m4a, audio/mp4, audio/mp4a, audio/mp4-audio, audio/mpeg"); 
  
      header('Content-Type: application/force-download');
  
      header("Accept-Ranges: bytes");
  
      header('Content-Transfer-Encoding: binary'); 
  
      header('Content-disposition: attachment; filename="'.$title.'.mp3"'); 
  
      header('Connection: Keep-Alive');
  
      header('Expires: 0');
  
      header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  
      header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
  
      header("Cache-Control: private", false);
  
      header('Pragma: no-cache');
  
      readfile($mp3path);
  
      exit;

  I can download this audio file but few mp3 players are not able to play it when i did some research on by using mp3val [mp3val.sourceforge.net]. I found this file do not contain sample-rate, bit-rate or some other required codecs inside the file.
  Error received from mp3val: Unknown file format

  I know one possible way of doing this which is ffmpeg but i am looking for a less time consuming option of doing this because first ffmpeg download the whole file and then convert it to mp3 and save it on server. It takes a lot of time.

  I am looking for a easiest solution in which, i dont want to save the whole file on my server. I want to call this file from remote server and want to add sample rate, bit-rate in the file and then just somehow with php i want to start download on browser.

  All i mean to say i need a faster solution. I have seen 2 yt to mp3 converter, They are doing the same thing, giving instant download. i dont know how?

  Please if you think its a stupid question or not possible then dont report to stackoverflow. I am trying to figure it out that’s why i am asking this question here. I hope you’ll understand my curiosity.

  Thanks,