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• Editing and restreaming rtmp stream in python

  31 mai 2020, par REgorion

  There is an nginx rtmp lan server that is being streamed from OBS. There is a Python script that determines whether there is nsfw content on the screen based on a screenshot. The result is calculated in real time and sent over tcp. The task of another script is to Get the result over tcp - it can do this. Receive a stream from an rtmp lan server and overlay the video stream a second before nsfw content appears. In theory, I need to receive the stream and send it with a delay of a second, and if the signal comes over tcp, then overlay the video.

  



  I don't understand how I can implement this buffer, write stream to it, process it, and publish it. The overlay can be applied via opencv, but the issue of implementing the buffer and posting it remains open. I looked in the direction of ffmpeg, but I don't understand how to organize streaming.

  



  What libraries can help me solve this problem ? Is there any related literature ?

  



  Sorry for my english

  


• Révision 24489 : [Salvatore] [source : ecrire] Export depuis https://trad.spip.net de la langue de

  4 février 2020, par salvatore@rezo.net

  Credits : klaus++ <klaus@spip.de>

• Run PHP exec() asynchronously, but check for completion ?

  1er septembre 2015, par PeregrineStudios

  I’m coding up a website back-end that will include user-uploaded video. In order to ensure maximum accessibility, I’m compressing the uploaded videos and re-saving them as .mp4 and .webm format to cover all browsers (or as many as possible anyway). To do this, I’m running an avconv command in the PHP exec() function.

  I don’t want to make the user wait for the script to finish before the page loads, so I’m running the code asynchronously. My code so far is below.

  exec('bash -c "exec nohup setsid avconv -i ' . $tempPath . ' -c:v libx264 ' . $transpose . ' ' . $newPath . 'mp4 > /dev/null 2>/dev/null &"');
  
  exec('bash -c "exec nohup setsid avconv -i ' . $tempPath . ' -c:v libvpx ' . $transpose . ' ' . $newPath . 'webm > /dev/null 2>/dev/null &"');

  In addition to running the exec functions, I also save the video to a database and send the user an email thanking them for uploading their video.

  Here’s the rub : I want the server to WAIT until the video conversion is finished, and THEN add it to the database and send the user an email. Basically, the program flow would be :

  User uploads video.
  Video is placed in a temp folder.
  User is taken to a thank you page indicating their video will be up shortly.
  The server executes two avconv commands to convert and compress the video for web use.
  Once BOTH conversions are finished, the video info is added to a MySQL database, an email is sent to the user, and the original uploaded video is deleted.

  It may just be my ignorance of the command line (in fact it almost definitely is), but how could I ’queue up’ these commands ? First do both conversions, then call a PHP script to add to the database, then delete the original video, all while being asynchronous with the original PHP script ?

  EDIT : I’ve tried queuing them up with an ’&&’ operator, like below :

  exec('bash -c "exec nohup setsid avconv -i ' . $tempPath . ' -c:v libx264 ' . $transpose . ' ' . $newPath . 'mp4 && avconv -i ' . $tempPath . ' -c:v libvpx ' . $transpose . ' ' . $newPath . 'webm > /dev/null 2>/dev/null &"');

  However, that seems to cancel out the fact that I’m running it asynchronously, since the page now seems to wait for the command to finish.