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• docs : Fix simple typo, numer -> number

  17 septembre 2020, par timgates42

  docs : Fix simple typo, numer -> number
  There is a small typo in test/vendor/mocha.js.
  Should read `number` rather than `numer`.
  

• 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 remove 2 sec from middle of video and concat the parts. Single line solution

  15 janvier 2019, par Aaron Broderick

  I have a video file that is 22 seconds long.
  I want to remove the segment from 10 seconds to 12 seconds.
  Then return a concatenated video file of seconds 1-10 and 12-22.

  I want to do this in a single FFmpeg command.

  This is the easy way

  Source
  https://www.labnol.org/internet/useful-ffmpeg-commands/28490/

  ffmpeg -i input.mp4 -ss 00:00:00.0 -codec copy -t 10 output_1.mp4

  and

  ffmpeg -i input.mp4 -ss 00:00:12.0 -codec copy -t 10 output_2.mp4

  then create an input file with all the source file names and run

  ffmpeg -f concat -i file-list.txt -c copy output.mp4

  But I’m looking for a one line solution

  Any help would be appreciated.