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• ffmpeg : concatinating files creates audio artefacts

  28 octobre 2022, par LML

  I'm currently trying to create a video out of multiple short video files. However, the final video always has audio artefacts, where it sounds like a short high pitch or echo at certain times during the audio. All the audio is a text-to-speech generated voice. No music. The artefacts appear sometimes more, sometimes less. But I would obviously prefer to have 0 of it.

  


  My starting point is a long audio file (mono with audio codec "mp3" according to ffprobe). Within that file are a bunch of short pauses of 4-5 seconds. I detect the silences and create individual audio files from there. Afterwards I create an mp4 file with this audio and a still image. Up to this point, the audio is perfectly fine and sounds the exact same as in the original file.

  


  After this I want to create the final video : each of the individual parts added into one long video. There is a transition between each file to mark the changing of image and audio. But even when skipping the transition and simply adding all of these clips that were generated the same way together, the artefacts are still present.

  


  The commands I use to create the different files.

  


  Create individual audio files :
.\ffmpeg.exe -y -hide_banner -i TTSAudio.mp3 -ss 359.944 -to 372.02479 -c copy partXY.mp3

  


  Create individual video files by using a .png file as the video stream and the partXY.mp3 as the audio stream :
.\ffmpeg.exe -y -hide_banner -framerate 30 -loop 1 -i XY_full.png -i partXY.mp3 -c:v libx265 -c:a copy -shortest partXY.mp4

  


  For concatenating the files :
.\ffmpeg.exe -y -hide_banner -i part000.mp4 -i part001.mp4 -i part002.mp4 -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" -c:v copy -c:a copy final_video.mp4

  


  I've tried a lot of different things and codecs for the audio, without any luck. I use h265, as using h264 was causing weird video artefacts after uploading the file to YouTube.
I have tried reencoding, instead of copying (-c:a copy) at various stages, especially the final video. All without any luck.
I've used the different concatenation where you provide a list of files, which created a whole different set of problems.

  


  I've managed to filter the artefacts out by using -af "lowpass=f=2800", but that changes the voice a lot. I was also not able to notice the pitch visually when opening the audio in audacity, for example.

  


  Example :
https://soundcloud.com/thelml/sets/ffmpeg-audio-artefacts/s-LNr6UaMPgz9?si=f7b30e1e64bf4333ad055fa1fe21e9ec
Due to the files being so short, I seem to have to sometimes have to replay the bugged file to hear the artefact.

  


  So my question is : how do I fix this, without using a lowpass that basically changes the whole voice ?

  


• moviepy write_videofile giving error on remote host

  30 juillet 2021, par HadiH2o

  I'm trying to put a logo on a video using the moviepy module
This module works properly on my PC(windows) but gives an error when I run the following code on the remote host I bought(linux).

  


  code :

  


  import random
import moviepy.editor as mp
import requests


def video_watermark(url):
    corners = [("right", "top"), ("left", "top"), ("right", "bottom"), ("left", "bottom")]
    response = requests.get(url)
    with open("media/videos/raw_video.mp4", "wb") as file:
        file.write(response.content)

    video = mp.VideoFileClip("./media/videos/raw_video.mp4")

    logo = (mp.ImageClip("./media/bold_logo.png")
            .set_duration(video.duration)
            .resize(height=50)  # if you need to resize...
            .margin(right=8, top=8, opacity=0)  # (optional) logo-border padding
            .set_pos(random.choice(corners)))

    final = mp.CompositeVideoClip([video, logo])
    final.write_videofile("./media/videos/ready_video.mp4")

video_watermark("url")


  


  error :

  


  OSError: [Errno 32] Broken pipe
 
MoviePy error: FFMPEG encountered the following error while writing
file ./media/videos/ready_video.mp4:
 
b'Error initializing output stream 0:0 -- Error while opening encoder
for output stream #0:0 - maybe incorrect parameters such as bit_rate,
rate, width or height\n'


  


  please help me to fix this problem

  


• Evolution #2269 : Prise en compte des variantes d’une langue

  31 août 2011, par cedric -

  il est deja possible de gérer des langues dérivées : dans ton exemple ce serait fr_ca. Il y a le cas existant du pt_br (portugais du brésil). Mais il est un fait qu’actuellement, si la lange n’existe pas en pt_br on se rabat sur la langue du site ou le fr au final, sans forcément chercher dans pt (...)