FFmpeg

FFmpeg is a complete, cross-platform solution to record, convert and stream audio and video.

Get all information about it FFmpeg here: https://ffmpeg.org/ There you find also an indepth documentation.

• Producing digital intermediates (empty)
• Muxing Audio
  • Merging video and audio, with audio re-encoding
  • Copying the audio without re-encoding
  • Replacing audio stream
  • Combine 6 mono inputs into one 5.1 (6 channel) audio output
• Encoding HEVC (empty)