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• FFMPEG Merge a video that has sound with an mp3 audio file outputs audio out of sync [duplicate]

  23 février 2021, par Mahmoud Eidarous

  An example for further explanation :
I'm recording a video singing at the same time the singer sings in a song.
So, I have a video file(Me singing) and the audio file(the song).

  


  I tried this simple command :

  


  -i $video-i $audio-c copy -map 0:0 -map 1:0 -shortest output.mp4


  


  But, it gives an output with the video sound muted(my voice muted).

  


  And I want something more advanced to control the volume of each sound, and add filter to make the output sound sounds like it was recorded in a studio.. so after a long search through the documentation and similar questions, I made up this command here..

  


  -i $video -i $audio -filter_complex "[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.8[a1]; [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=4[a2]; [a1][a2]amerge,pan=stereo|c0code>

  


  It gives a video output with audio out of sync. (My voice doesn't match the singer).

  


  Any help would be really appreciated !

  


• Uncomplete path recognition (FFmpeg) [duplicate]

  23 septembre 2022, par Francesco Battisti

  The script should download an entire playlist (only one song for this test) from YT and convert all the downloaded MP4 to MP3 :

  


  from distutils import extension
from pytube import Playlist
import os

link = input("Enter YouTube Playlist URL: ")

yt_playlist = Playlist(link)

for video in yt_playlist.videos:
    downloaded_file = video.streams.filter(only_audio=True).first().download(r"C:\Users\Francesco\Desktop\Music\JC's\+++NEW+++")
    file, extension = os.path.splitext(downloaded_file)
    # Convert video into .mp3 file
    os.system('ffmpeg -i {file}{ext} {file}.mp3'.format(file=file, ext=extension))


  


  Now, when I put the playlist's url in input, the script downloads the song but it can't convert it because :

  


  C:\Users\Francesco\Desktop\Music\JC's\+++NEW+++\Ariete: No such file or directory


  


  but the right path is :

  


  C:\Users\Francesco\Desktop\Music\JC's\+++NEW+++\Ariete - LULTIMA NOTTE Testo  Lyrics


  


  so it stops when is there a space in directory name...

  


• Extract alpha from video ffmpeg

  23 octobre 2018, par Yarik Denisyk

  I want to overlay transparent video on the background image. I have a video where the top half is RGB object and bottom half is an alpha mask.

  Now, for making this I do next steps :

  1) I am extracting all frames from video and save to the folder

  2) Each frame splitting to top and bottom half bitmap

  3) Top bitmap composite with bottom mask for extract alpha and get a frame with transparent background

  3) I am drawing each frame on the background and save to a folder

  4) Create a video using FFmpeg

  The problem is step 2, 3 and 4, they very slow. Maybe has another way to overlay transparent video on the background image ?