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• Error with IO.popen and ffmepg

  6 mars 2015, par Florian Dano Clement

  I received files in mp3 (2 minutes/files) I want to concatenate together and create a bigger file. So I created my model a function to do this using ffmpeg and IO.popen

  FileUtils.mkdir_p "#{Rails.root}/tmp/files"
  
  imported_dir = "#{Rails.root}/tmp/files/#{SecureRandom.uuid}"
  
  links.each_with_index do |link, index|
  
    file_path = "#{imported_dir}_#{index}#{File.extname(link)}"
  
    File.open(file_path, 'wb') do |file|
  
      file.write open(link).read
  
    end
  
    concat_list << "file '#{file_path}'\n"
  
  end
  
  File.open("#{imported_dir}.txt", 'w'){ |f| f.write(concat_list)}
  
  io = IO.popen("#{Rails.root}/lib/ffmpeg/ffmpeg -f concat -i #{imported_dir}.txt -c copy #{imported_dir}.mp3").readlines
  
  if sound = Sound.create(user_id: user.id, file: File.open("#{imported_dir}.mp3"), lang: lang, title: title)
  
    audio = FFMPEG::Movie.new("#{imported_dir}.mp3")
  
    if !audio.valid?
  
      puts "//_!_\\\\ Failed reading with ffmpeg (#{sound.id})#{sound.title} //_!_\\\\"
  
      return false
  
    end
  
  end 

  the problem is that my .txt file containing the file path

  file '/home/test/apps/example/releases/20150305224026/tmp/files/4dbe9707-cfef-467b-ab2c-a5e1e1165953_0.mp3'

  created files as well but the final file is not created and i got the error message :

  No such file or directory @ rb_sysopen - /home/test/apps/example/releases/20150305224026/tmp/files/4dbe9707-cfef-467b-ab2c-a5e1e1165953.mp3

  If anyone could help me

• how to add header info to a wav file to get a same result as ffmpeg ?

  30 avril 2023, par Q.Tong

  I'm trying to generate a .wav file with Fastspeech. When I save the data as .pcm file, and transfer it to .wav by ffmpeg, it works well.But when I just add a wav header info and save it into .wav, it sounds very noisy, What's wrong with my code ?

  


  code for pcm :

  


      wav = wav.astype(np.float32)
    wav = wav.tostring()
    with open('test.pcm', 'wb') as f:
        f.write(wav)


  


  ffmpeg command :

  


  ffmpeg -f f32le -ar 16000 -i test.pcm file.wav  # works well


  


  write wav straightly :

  


  import struct

def pcm2wav(sample_rate, pcm_voice):
    if pcm_voice.startswith("RIFF".encode()):
        return pcm_voice
    else:
        sampleNum = len(pcm_voice)
        rHeaderInfo = "RIFF".encode()
        rHeaderInfo += struct.pack('i', sampleNum + 44)
        rHeaderInfo += 'WAVEfmt '.encode()
        rHeaderInfo += struct.pack('i', 16)
        rHeaderInfo += struct.pack('h', 1)
        rHeaderInfo += struct.pack('h', 1)
        rHeaderInfo += struct.pack('i', sample_rate)
        rHeaderInfo += struct.pack('i', sample_rate * int(32 / 8))
        rHeaderInfo += struct.pack("h", int(32 / 8))
        rHeaderInfo += struct.pack("h", 32)
        rHeaderInfo += "data".encode()
        rHeaderInfo += struct.pack('i', sampleNum)
        rHeaderInfo += pcm_voice
        return rHeaderInfo

# .......
# get data with FastSpeech model
wav = wav.astype(np.float32)
wav = wav.tostring()
wav = pcm2wav(16000, wav)
with open('test.wav', 'wb') as f:
    f.write(wav)   # many noisy sounds


  


• Converting png images series to webm with transparent white background from Daz3d

  25 août 2015, par James

  I’m trying to make a webm video with a transparent background from a Daz3D model.
  My process is export png image series with transparent background from Daz3D, use ffmpeg to convert png series to webm video.
  This was working well in Daz3D 4.6.

  But in Daz3D 4.8 the exported background is black instead of white, so when converted to webm is ok on Chrome as has the transparency, but on Firefox is black and has a halo (as Firefox does not support transparency so displays background).

  So I’m looking for a solution with Daz3D, or tools like ImageMagik.
  I almost got it with ImageMagik,

  convert -alpha extract *.png mask.png
  
  mogrify -flatten talk*.png
  
  for /f %x in ('dir /s /b blink*.png') do @composite -compose CopyOpacity mask-0.png %x %x

  But for some reason the final webm has a white background not transparent ...
  Some more info here,

  http://www.daz3d.com/forums/discussion/61237/daz3d-4-8-png-background-is-black

  and here,

  http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=28214

  >
  Doh, okay I figured it out. My images were good, but I somehow have two different versions of ffmpeg on my computer and was using the wrong one that doesn’t seem to support transparency.

  Now it is working.

  My only issue is the last shell line,

  for /f %x in (’dir /s /b blink*.png’) do @composite -compose CopyOpacity mask-0.png %x %x

  This only uses mask-0.png, instead of mask-1 for blink01.png, mask-2 for blink02.png etc.