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• FFMPEG : Fill/Change (part of) audio waveform color as per actual progress with respect to time progress

  13 août 2018, par Software Development Consultan

  I am trying to make command which is generating waveform from mp3 file and show on background image and play audio.
  Togethr with this, I want to change waveform color left to right (something like progressbar) as per overall video time elapses.

  I have created following command which shows progress bar using drawbox to fill box color as per current time position.

  ffmpeg -y -loop 1 -threads 0 -i sample_background.png -i input.mp3 -filter_complex "color=red@0.5:s=1280x100[Color] ;[0:v]drawbox=0:155:1280:100:gray@1:t=fill[baserect] ;[1:a]aformat=channel_layouts=mono,showwaves=s=1280x100:rate=7:mode=cline:scale=sqrt:colors=0xffffff[waveform] ; [baserect][waveform] overlay=0:155 [v1] ;[v1][Color] overlay=x=’if(gte(t,0), -W+(t)*64, NAN)’:y=155:format=yuv444[v2]" -map "[v2]" -map 1:a -c:v libx264 -crf 35 -ss 0 -t 20 -c:a copy -shortest -pix_fmt yuv420p -threads 0 output_withwave_and_progresbar.mp4

  

  But I want to show progress inside generated audio waveform instead of making / filling rectangle using drawbox.

  So I have tried to make 2 waveform of 2 different color and overlay on each other and I wanted to show such a way that top waveform should display only part from x position (left) respective to current time.

  ffmpeg -y -loop 1 -threads 0 -i sample_background.png -i input.mp3 -filter_complex "[0:v]drawbox=0:155:1280:100:gray@1:t=fill[baserect] ;[1:a]aformat=channel_layouts=mono,showwaves=s=1280x100:rate=7:mode=cline:scale=sqrt:colors=0xff0000[waveform] ;[1:a]aformat=channel_layouts=mono,showwaves=s=1280x100:rate=7:mode=cline:scale=sqrt:colors=0xffffff[waveform2] ; [baserect][waveform] overlay=0:155 [v1] ;[v1][waveform2] overlay=x=’if(gte(t,0), -W+(t)*64, NAN)’:y=155:format=yuv444[v2]" -map "[v2]" -map 1:a -c:v libx264 -crf 35 -ss 0 -t 20 -c:a copy -shortest -pix_fmt yuv420p -threads 0 test.mp4

  But I am not able to find way to do Wipe effect from left to right, currently it is sliding (as I am changing x of overlay)
  It might be done using alpha merge and setting all other pixel to transparent and only show pixels which are less than x pos.
  but I am not able to find how to do this.

  Background image :
  

  we can use any mp3 file file, currently I have set 20 sec duration.

  Can someone please guide how we can do this ?

  Thanks.

• FFMPEG - Add (white, color-less, analog) grain to the video without desaturating video itself

  2 décembre 2018, par dd_code

  I am working on old videos where I am basically converting them to HVEC and sharpening, so i.e. my command can look like this

  .\ffmpeg.exe -i F:\file.mkv -vf unsharp=3:3:1.5 -c:v hevc_nvenc -qp 27 -a:c copy file_new.mkv

  inherent problem with this is, of course that with reducing bitrate and sharpening every now and then I can notice some nasty artifacts around the edges and on at plain-color objects.

  I noticed with some older, many times remastered movies/series that they have quite a lot of grain in the video, so I was thinking - what if I add grain and help it to mask the compression and sharpening artifacts ?

  After bit of searching I got to
  https://ffmpeg.org/ffmpeg-filters.html#noise
  and now I am using this command

  .\ffmpeg.exe -i F:\file.mkv -vf unsharp=3:3:1.5,noise=alls=14:allf=t+u -c:v hevc_nvenc -qp 30 -a:c copy file_new.mkv

  however this has one big problem, it is merely a digital RGB noise, is there a way to make it desaturated, analog-ish ? I tried adding h=s=0, however this is applying 0 saturation to the video track as a whole. Is there an effect which would achieve this or is there a way that I can reduce the saturation only of the very effect which then gets to "overlay" the video track, so the track would not be touched ?

• How do I make my Discord Bot play mp3 files, while in a voice Channel ? (FFMPEG problem)

  27 mars 2019, par João Pimenta

  I’m trying to make a bot that joins the voice channel, plays a mp3 file from my computer, and leaves the channel afterwards.

  It "does" work, joins, leaves, but it doesn’t plays any sound, sometimes it produces static-like noises though, which made me think it is a FFMPEG problem.

  I’m on a ubuntu 16.04.

  I have tried changing the way I show the function what the path is for my .mp3 file. I came to the conclusion that ('/home/user/djsBot/01.mp3'); is the correct way to do it (the documentation asks for an absolute path), because I thought it wasn’t able to locate my file.

  I have also tried uninstalling and installing ffmpeg-binaries, same for node-opus, both of which give me moderate vulnerability reports (not sure what this means) and tell to run npm audit fix.

  I’m somewhat new to ubuntu, and a complete beginner on JS and Node.JS, so any tips or clarification are welcome. :)

  client.on('message', (msg) => {
  
    if (msg.content === '1') { // user types '1' to play a sound
  
      if (msg.member.voiceChannel) {
  
        msg.member.voiceChannel.join() // bot joins user's channel
  
        .then(connection => {
  
            const dispatcher = connection.playFile('/home/user/djsBot/01.mp3');
  
            dispatcher.on("end", end => {
  
              msg.member.voiceChannel.leave();
  
            });
  
        }).catch(err => {
  
            console.log(err);
  
          });
  
      }
  
      else {
  
        msg.channel.send(`You must be in a Voice Channel for me to talk to you, ${msg.author.username}!`);
  
      }
  
    }
  
  });