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• "Smooth" the ffmpeg showwaves video filter output

  24 décembre 2019, par goodytx

  I think I’m close to what I’m after, thanks to excellent answers like : FFMPEG : Fill/Change (part of) audio waveform color as per actual progress with respect to time progress ...but not quite there !

  I’m scripting the generation of a waveform video with showwaves, and overlaying that onto a static image background, turning the whole thing into video. All is well, except I’d like to "smooth" the waveform. In most tutorials/answers you will see jagged "peaks" in the waveform animation, as of course the audio data varies widely into peaks and troughs. (The differences expressed between the lowest and highest amplitude (I think) in each audio frame sample.) I’d like to get more of a consistent "flowing wave", without the sharp spikes up and down.

  Currently using the filter much as described in the previous link :

  [1:a]aformat=channel_layouts=mono,asplit[red][white]; \
  
  [red]showwaves=s=1280x100:rate=15:mode=cline:scale=sqrt:colors=0xff0000[red]; \

  Which results in the following (ignoring the red on white overlay, which I may drop) :

  Current v desired

  This generates the type of wave plot I want (solid vs a sine, for example), but I think I need to either tweak the audio stream or...possibly post filter the showwaves video stream (but I think the former) to get the effect I want. I tried to reduce the rate of showwaves but that just results in juddery video. So to me that feels like the audio data needs to be the changed factor.

  My limited audio knowledge leads me to think I should gain, compress, normalize, or all of the above, the audio input, which I have tried, but can’t seem to nail it. Keep in mind the audio stream in this filter chain is purely feeding the showwaves filter, so I can "trash" it as much as needed in order to get the visualization I want.

  I hope this all makes sense, and if I need to provide more info, please let me know. Thanks !

• ffmpeg not working if run from py2app

  28 juin 2018, par dprogramz

  I’m trying to build a simple app that concats 2 mp4 files. It works fine if I run it from the command line, but if I run it from py2app app it doesn’t work. If I run the app from within the py2app in the console (eg ’dist/addTag.app/Contents/MacOS/addTag’), it works fine. It only doesn’t work if i run the app by double clicking on it. Any ideas ? code below

  #! /usr/bin/python
  
  import argparse
  
  import ffmpeg
  
  import os
  
  import shutil
  
  import sys
  
  from Tkinter import *
  
  import time
  
  
  
  fields = 'Input Video', 'Tag Video', 'Output Name'
  
  
  
  def fetch(entries, bu, lb, rt):
  
      bu['state'] = 'disabled'
  
      lb['text'] = 'working'
  
      rt.update()
  
      ffmpeg.concat(ffmpeg.input(entries[0][1].get()), ffmpeg.input(entries[1][1].get())).output(os.path.expanduser("~/desktop/")+entries[2][1].get()).run()
  
      bu['state'] = 'normal'
  
      lb['text'] = 'Ready'
  
      rt.update()
  
  
  
  
  
  def makeform(root, fields):
  
     entries = []
  
     for field in fields:
  
        row = Frame(root)
  
        lab = Label(row, width=15, text=field, anchor='w')
  
        ent = Entry(row)
  
        row.pack(side=TOP, fill=X, padx=5, pady=5)
  
        lab.pack(side=LEFT)
  
        ent.pack(side=RIGHT, expand=YES, fill=X)
  
        entries.append((field, ent))
  
     return entries
  
  
  
  if __name__ == '__main__':
  
     root = Tk()
  
     root.title("Video Maker")
  
     ents = makeform(root, fields)
  
     root.bind('<return>', (lambda event, e=ents: fetch(e))) 
  
     label = Label(root, text="Ready")
  
     label.pack(side=LEFT)  
  
     b1 = Button(root, text='Make Video',
  
            command=(lambda e=ents: fetch(e, b1, label, root)))
  
     b1.pack(side=LEFT, padx=5, pady=5)
  
     b2 = Button(root, text='Quit', command=root.quit)
  
     b2.pack(side=LEFT, padx=5, pady=5)
  
  
  
     root.mainloop()
  
  </return>

• Anyone know how to alter an FFMPEG command to output at half the size ?

  19 juin 2018, par James Rush

  I have an FMPEG command to scale down a video and add a blur to the background to fill the remaining height to 1136, plus add an overlay image, but it comes out at double the size I want. I am trying to get the whole video down to a 640 width without the overlay video being cropped or sized up. I’ve tried switching around every number but can’t seem to get it to work with a width of 640. Thank you for any help.

  ffmpeg -i '/z.mp4' -i '/a.png' -filter_complex "[0:v]scale=128/81*iw:128/41*ih,boxblur=luma_radius=min(h\,w)/40:luma_power=3:chroma_radius=min(cw\,ch)/40:chroma_power=1[bg];[bg][0:v]scale=1280:720,overlay=(W-w)/2:(H-h)/2,setsar=1,crop=w=iw*81/128[bg];[bg][1:v]overlay=82.8:118.8" '/h.mp4';