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• Encryption of OpenCV VideoWriter output

  19 juin 2017, par Aryan

  In an embedded project I was using opencv cv::VideoWriter to store frames as video files, also utilising lossless compression codecs (e.g.Lagarith). Now I have the requirement to encrypt the video files before storing them.

  1. Is it possible to get the encoded output from cv::VideoWriter so that an encryption step can be applied before writing the frame to disk ?

  2. Alternatively, is it possible to make cv::VideoWriter output to a custom output stream ? That way encryption steps can be applied on the stream.

  3. If neither of above is possible then is there an alternative to cv::VideoWriter that I can use to get the video format encoding done ?

  The end requirement is to write encrypted files which, after only a decryption step, become video files compatible with standard video players.

• Ffmpeg rebroadcast icecast stream and disconnect on silence

  4 janvier 2023, par CallumCat

  Currently, I'm using a combination of the Windows version of butt and VLC Media Player in order to rebroadcast an icecast stream from a remote icecast server to my local icecast server, whilst disconnecting whenever a certain duration of silence is detected.

  


  I would really prefer if there would be an easier way to do this on linux from the command line, so that it can run 24/7 without me having to constantly fix the VLC stream player every so often.

  


  I need a way for if silence is detected on the stream, it disconnects the relay and will reconnect whenever audio is detected again.

  


  As I've said before, I've been successfully using butt and VLC Media Player on Windows to do this, however would prefer a linux alternative.

  


• FFmpeg (HLS) - Split segments by size rather than time (or limit segment size)

  28 février 2019, par iMostLiked

  So I have a ffmpeg command with the following parameters (in NodeJS, but it doesn’t matter) :

  '-start_number 0',
  
  '-hls_key_info_file ' + HLSKEY_PATH,
  
  '-hls_time 5',
  
  '-hls_playlist_type vod',
  
  '-hls_segment_filename seg-%d.ts'

  Everything’s working fine, but there’s a problem with the size of each segment.
  Why can’t ffmpeg create segments by size rather than time ? In this case -hls_time 5. I was hoping doing something like -hls_size 4096 but there’s no option for that, at least from what I know. Or can I at least set a limit ? Like : "Don’t create segments bigger than 4MB, split them again if necessary."

  I know I could encode the file again and then there wouldn’t be segments which vary in size that much, but this is no option and alternative for me.

  Thanks in advance !