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• libavcodec/mpegaudiodecheader.h : fix version check pattern

  12 juillet 2018, par Karsten Otto

  libavcodec/mpegaudiodecheader.h : fix version check pattern
  This fixes the check for the reserved MPEG audio version ID,
  
  used to detect an invalid frame header.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpegaudiodecheader.h

• lavfi/selectivecolor : fix neutral color filtering

  9 août 2018, par Clément Bœsch

  lavfi/selectivecolor : fix neutral color filtering
  Neutrals are supposed to be anything not black (0,0,0) and not white
  
  (N,N,N).
  Previous neutral filtering code was too strict by excluding colors with
  
  any of its RGB component maxed instead of just the white color.
  Reported-by : Royi Avital <royiavital@yahoo.com>
  

  • [DH] libavfilter/vf_selectivecolor.c

• 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.