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• Speeding up videocomposing in pymovie

  10 février 2024, par rawlung

  I'm trying to resize videos similarly to what this api provides
https://creatomate.com/docs/json/quick-start/blur-video-background
I accomplished the result more or less but the problem is it takes ages to render out.
I'm a total beginner when it comes to video processing and for the life of me i can't figure out how to speed it up. When the rendering is running python only uses CPU at about 20% utilization.

  


  from moviepy.editor import VideoFileClip, concatenate_videoclips,CompositeVideoClipimport datetimefrom skimage.filters import gaussian

def _blur(image):
  return gaussian(image.astype(float), sigma=25,preserve_range=True,channel_axis=-1)

def blurVideos(filenames):
  clips = [VideoFileClip(c) for c in filenames]
  overlay_clips = [VideoFileClip((c), has_mask=True) for c in filenames]
  overlay = concatenate_videoclips(overlay_clips,"chain")
  output = concatenate_videoclips(clips, method="chain")
  print("Bluring video")
  blured_output = output.fl_image( _blur )
  print("Done")
  print("Resizing video")
  resized_output = blured_output.resize((1920,1080))
  print("Done")
  composited_output = CompositeVideoClip([resized_output.without_audio(),overlay.set_position("center","center")])
  composited_output.write_videofile(f"output/out_{datetime.datetime.today().strftime('%Y-%m-%d')}.mp4",fps=20,threads=16,codec="h264_nvenc",preset="fast")


  


  I've tried to use GPU accelerated codecs like h264_nvenc, I've tried to modify ffmpeg arguments under the hood of moviepy to use cuda also no succses
What can i do to speed this up ?

  


• How do I extract video layers from an AVI ?

  14 janvier 2018, par Philosophistry

  I have a Fujifilm FinePix Real 3D W3, and it creates something Fujifilm calls 3D-AVI files. There are pograms to split these 3D-AVI files into separate left-and-right movies, but they involve using GUI-based software on Windows.

  I would rather use a command-line tool like ffmpeg, so that I can automate the process. Does anybody have any suggestions on how to go about doing this ?

  I’ve heard on forums that the 3D-AVI file is simply left and right AVIs on two video layers. I couldn’t see anything in the ffmpeg docs on how to extract these layers.

• How to use ffmpeg in uwp ?

  22 avril 2022, par MrL

  I developed a software with electron. It needs ffmpeg, but when I package it into appx, I won't be able to use ffmpeg.

  


  let FFmpegPath = path.resolve(AppPath, "FFmpeg");
let FFMPEGPATH = path.resolve(FFmpegPath, "ffmpeg");
let FFPROBEPATH = path.resolve(FFmpegPath, "ffprobe");
let FFoption_V = '"'+FFPROBEPATH+'"' + " -i " +'"'+ path.normalize(PATH)+'"' + " -show_streams -select_streams v -of json";
EXEC_V = C_PRO.execSync(FFoption_V);


  


  This is the information I found, but it doesn't seem to work for electron :https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/desktop-to-uwp-extensions

  


  <package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10">&#xA;  ...&#xA;  <capabilities>&#xA;      &#xA;  </capabilities>&#xA;  <applications>&#xA;    <application>&#xA;      <extensions>&#xA;          &#xA;              &#xA;                  &#xA;                  &#xA;              &#xA;           &#xA;      </extensions>&#xA;    </application>&#xA;  </applications>&#xA;</package>&#xA;