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• What are the gotchas of using statically linked libraries in serverless platforms such as Google Cloud Functions ?

  5 septembre 2017, par Dzh

  Libraries such as ffmpeg-static upload statically linked binaries onto container.

  I wonder what are the drawbacks of using this approach ?

  Does the library size counts against your memory use (it’s billed by GCloud) ?

  Does it slow down the container ? Perhaps some future-proofing issues ?

  Edit : Found something of a related (I wanted to setup OpenCV) on AWS blog. It doesn’t explain drawbacks, just shows how to do it exactly.

• Using HEVC with Alpha to Compose Moviepy Video

  3 avril, par James Grace

  I'm using moviepy, PIL and numpy and trying to compile a video with 3 components : A background image that is a PNG with no transparency, an Overlay Video that is a HEVC with Alpha, and a primary clip that is produced with a collection of PNG images with transparency.

  


  The video is composed with background + overlay video + main video.

  


  The problem I'm having is that the overlay video has a black background, so the background image is covered completely. Moviepy is able to import the HEVC video successfully by it seems as though the Alpha channel is lost on import.

  


  Any ideas ?

  


  Here's my code :

  


  from PIL import Image
import moviepy.editor as mpe
import numpy as np

def CompileVideo() :

    frames = ["list_of_png_files_with_transparency"]
    fps = 30.0
    clips = [mpe.ImageClip(np.asarray(Image.open(frame))).set_duration(1 / int(fps)) for frame in frames]
    ad_clip = mpe.concatenate_videoclips(clips, method="compose")
    bg_clip = mpe.ImageClip(np.asarray(Image.open("path_to_background_file_no_transparency"))).set_duration(ad_clip.duration)

    overlay_clip = mpe.VideoFileClip("path_to_HEVC_with_Alpha.mov")

    comp = [bg_clip, overlay_clip, ad_clip]

    final = mpe.CompositeVideoClip(comp).set_duration(ad_clip.duration)
    final.write_videofile("output.mp4", fps=fps)


  


• Invalid argument error in writing video file using moviepy and ffmpeg

  28 janvier 2024, par Kresreb

  I have this code that used to work fine and now isn't. I have this error :

  


      Traceback (most recent call last):&#xA;  File "D:\videos\tiktoks\faitsasavoir\bot\mre.py", line 18, in <module>&#xA;    clip_final.write_videofile(f"rendus_finaux/output.mp4", fps=24)&#xA;  File "", line 2, in write_videofile&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\decorators.py", line 54, in requires_duration&#xA;    return f(clip, *a, **k)&#xA;  File "", line 2, in write_videofile&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\decorators.py", line 135, in use_clip_fps_by_default&#xA;    return f(clip, *new_a, **new_kw)&#xA;  File "", line 2, in write_videofile&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\decorators.py", line 22, in convert_masks_to_RGB&#xA;    return f(clip, *a, **k)&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\video\VideoClip.py", line 300, in write_videofile&#xA;    ffmpeg_write_video(self, filename, fps, codec,&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\video\io\ffmpeg_writer.py", line 228, in ffmpeg_write_video&#xA;    writer.write_frame(frame)&#xA;  File "C:\Users\Brice\AppData\Local\Programs\Python\Python39\lib\site-packages\moviepy\video\io\ffmpeg_writer.py", line 180, in write_frame&#xA;    raise IOError(error)&#xA;OSError: [Errno 22] Invalid argument&#xA;&#xA;MoviePy error: FFMPEG encountered the following error while writing file rendus_finaux/output.mp4:&#xA;&#xA; b&#x27;rendus_finaux/output.mp4: No such file or directory\r\n&#x27;&#xA;</module>

  


  It tried different versions of moviepy, Python and reinstalling ffmpeg etc, but couldn't solve it. My main idea is that is a version problem, but i can't find out.

  


  I recreated the error with this mre, it's just a code to make a video from multiple images. Thank you for your help.

  


  from moviepy.editor import ImageClip, CompositeVideoClip, concatenate_videoclips
    
    DURATION_PER_IMAGE = 5
    
    images = ["D:/videos/image1.png","D:/videos/image1.jpg"]
    
    clips = []
    for image in images:
        #Main image
        clip = ImageClip(image).set_duration(DURATION_PER_IMAGE).resize(width=1080)
        clip = clip.resize(lambda t : 1+0.02*t)
    
        #Create clip composite
        clip_composite = CompositeVideoClip([clip.set_position("center")], size=(1080,1920))
        clips.append(clip_composite) # Add created clip to the list of clips
    
    clip_final = concatenate_videoclips(clips)
    clip_final.write_videofile(f"rendus_finaux/output.mp4", fps=24)