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• streaming a .mov to the browser as it's being written

  1er juillet 2016, par max pleaner

  I’m using the headless and selenium-webdriver gems to create a video :

  # require gems
  
    require 'headless'
  
    require 'selenium-webdriver'
  
  
  
  # start headless
  
    headless = Headless.new
  
    headless.start
  
    headless.video.start_capture
  
  
  
  # use selenium
  
    driver = Selenium::WebDriver.for(:firefox)
  
    driver.navigate.to("http://google.com")
  
    puts driver.title
  
  
  
  # exit headless and save video
  
    headless.video.stop_and_save("test.mov")
  
    headless.destroy

  This produces a test.mov video.

  In this example, I have a finalized .mov file which I could the push to the browser if I wished.

  But I’m hoping there’s a way to stream is as it’s being created.

  If it helps, headless accepts configuration arguments for ffmpeg.

• How to modify pitch in audio of video file with singing voices

  9 janvier 2020, par Keith Bennett

  I have some karaoke .mp4 video files (legally obtained) for Thai songs, and want to convert the pitch downward to fit my singing range. I’ve gotten most of the way there thanks to https://superuser.com/questions/292833/how-to-change-audio-frequency/1076762#1076762
  using a command line like this :

  ffmpeg -i in.mp4 -af 'asetrate=35280.0,atempo=1.25' out.mp4

  ...but the human singing voices don’t sound natural at the modified pitch.

  Is there a better way to change the pitch ? I know some commercial products can do this.

  By the way, I wrote a Ruby script to simplify this ffmpeg call ; it’s at https://gist.github.com/keithrbennett/9ba7043792bfb2fcc92d615076a8413f. It enables you to specify a single factor, and modifies both pitch and tempo accordingly.

• FFmpeg - Overlay one video onto another video ?

  9 février 2016, par CDR LDN

  I understand that this is a very open ended question. I have done some initial reading into FFmpeg, but now require some guidance.

  Problem

  • I have a video input.mov.
  • I would like to overlay another video on top of overlay.wov.
  • The result should be a single video (output.mov).

  Notes

  • Done some initial reading into FFmpeg and read this question.

  Thanks - C.

  Edits

  1. Backend is Go/Ruby. Open to using a new language.
  2. The audio from the first video should be kept.
  3. Setting the interval at which the overlay starts would be great.

  Current Solution

  ffmpeg -i input.mov -i overlay.mov -filter_complex "[0:0][1:0]overlay[out]" -shortest -map [out] -map 0:1 -pix_fmt yuv420p -c:a copy -c:v libx264 -crf 18  output.mov

  This nearly works, however :

  • Overlay is cut short even though the two videos (input.mov & overlay.mov) are the same length.
  • I cannot start the overlay at any interval apart from 0:00.