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• audioread.NoBackendError on augmented audio files

  23 mars 2019, par elongated space

  Problem :

  I have applied a number of augmentation techniques such as pitch shift and stretching to a number of wav clips and have outputted them to a folder - Windows 10 plays these clips fine.

  However, when i try to load these clips with librosa using the following code :

  wav_clip, sample_rate = librosa.load(file_path, mono=True, sr=None)

  i get "audioread.NoBackendError"

  What I’ve Tried :

  Installed ffmpeg using this video https://www.youtube.com/watch?v=xcdTIDHm4KM. to confirm it worked i entered the following into windows command line :

  "ffmpeg -version"

  Where i got an output of the version and configuration details.

  I have also tried to import ffmpeg from the list of available packages in PyCharm, but i still get the error.

  Am i missing something ?

  All the original, unaltered wav files work and load fine.

• Turn Mp4 File into Portrait Video

  5 avril 2022, par Tech Breaker

  I recently programmed a bot, which uses the Twitch API to scrape Twitch videos, and then post them on YouTube. This is my youtube channel if you want to see an example : https://www.youtube.com/channel/UCuhWw8LbPWdkybIF9olAszw

  


  The problem that I am having is I want to find a way to convert these regular twitch videos, into youtube shorts which I can automatically upload. The facecam does not need to be included, and the entire video can just be compressed into a 9:16 format.

  


  I already tried FFMPEG but I don't know if I am doing it correctly, and really need help or advice on how to do this.

  


  Here is an example of a video I would try to convert :
https://www.youtube.com/watch?v=hZecXrvd6_g

  


  (excuse the explicit language, this is just the first video I saw on my bot channel)

  


  Tldr : Convert mp4 file into a 9:16 video format

  


  EDIT :

  


  Command i ran : ffmpeg -i video.mp4 -vf scale=1280:720 output.mp4

  


• Creating a smooth animation with ffmpeg filters

  30 mai 2021, par user1503606

  I am trying to add a watermark to a video using ffmpeg and have it animated from left to right in the center of the video.

  


  I have it working with the following command.

  


  ffmpeg -y -i Volkswagen.mp4 -loop 1 -i logo.png -filter_complex overlay=x='W/30*mod(t,30):enable=gt(mod(t,60),0)':y=main_h/2-overlay_h/2:shortest=1 Volkswagen_watermarked.mp4


  


  It works but the outcome looks like this.

  


  https://www.youtube.com/watch?v=M31wG2ub1Lg

  


  The video is from here : https://gist.github.com/jsturgis/3b19447b304616f18657

  


  http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/VolkswagenGTIReview.mp4

  


  As you can see its not very smooth. I am just trying to get my head around the ffmpeg filter functions this is the first time I have used them so would appreciate some advise or is this as good as it gets ?

  


  I have looked at a few other posts but cant find any that can help with this maybe there is another filter I should be using ?

  


  I can run a draw filter command like this and the animation is smoother.

  


  ffmpeg -y -i Volkswagen.mp4 -vf "drawtext=fontfile=/Montserrat-Medium.ttf:text='Text':x=200:y=h-20*t: fontsize=36:fontcolor=yellow@0.9: box=1: boxcolor=black@0.6" -c:a copy VolkswagenText.mp4


  


  But it is obviously not looping.

  


  https://www.youtube.com/watch?v=wdANCWUHaMc

  


  I dont really understand whats happening here.

  


  w*mod(t\,10):enable=gt(mod(t\,60)\,0)

w = width of text
t = time in seconds


  


  I understand if I just have this.

  


  -filter_complex "overlay=x=w*t:y=main_h/2-overlay_h/2:shortest=1"

w*t = every second the x position is incremented by the text width * time


  


  so if the text width is 100px it would be something like this.

  


  1x100 = 100;
2x100 = 200;
etc


  


  What does the mod() function do ? I cant find any help really here https://ffmpeg.org/ffmpeg-filters.html

  


  is this saying when x is greater than the width of the viewport start again ?

  


  enable=gt(mod(t\,60)\,0)


  


  Thanks