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• Anomalie #3082 (Nouveau) : Plugin Comments : Double définition de #forum

  1er novembre 2013, par jeanmarie grall

  il semble qu’avec la dist (3.0.11) et le plugin Comments (3.2.7), il y ait une double définition de l’ID forum dans les articles :
  une 1ère fois dans la dist > article.html (L55) puis dans le plugin > comments\inclure\forum.html (L3)
  La ligne en question :
  Du coup, ça provoque une erreur de validation HTML...

  Proposition de b_b : "Je pense qu’il serait "logique" de déplacer l’ancre en question dans inclure/forum de la dist pour fixer le bp. "

• moviepy black border around png when compositing into an MP4

  27 août 2022, par OneWorld

  compositing a png into an MP4 video creates a black border around the edge.

  


  This is using moviepy 1.0.0

  


  Code below reproduces the MP4 with the attached red text png.

  


  

  


  import numpy as np
import moviepy.editor as mped
def composite_txtpng_on_colour():
    bg_color = mped.ColorClip(size=[400, 300], color=np.array([0, 255, 0]).astype(np.uint8),
                          duration=2).set_position((0, 0))
    text_png_postition = [5, 5]
    text_png = mped.ImageClip("./txtpng.png", duration=3).set_position((text_png_postition))

    canvas_size = bg_color.size
    stacked_clips = mped.CompositeVideoClip([bg_color, text_png], size=canvas_size).set_duration(2)
    stacked_clips.write_videofile('text_with_black_border_video.mp4', fps=24)

composite_txtpng_on_colour()


  


  The result is an MP4 that can be played in VLC player. A screenshot of the black edge can be seen below :-

  


  

  


  Any suggestions to remove the black borders would be much appreciated.

  


  Update : It looks like moviepy does a blit instead of alpha compositing.

  


  def blit(im1, im2, pos=None, mask=None, ismask=False):
    """ Blit an image over another.  Blits ``im1`` on ``im2`` as position ``pos=(x,y)``, using the
    ``mask`` if provided. If ``im1`` and ``im2`` are mask pictures
    (2D float arrays) then ``ismask`` must be ``True``.
    """
    if pos is None:
        pos = [0, 0]

    # xp1,yp1,xp2,yp2 = blit area on im2
    # x1,y1,x2,y2 = area of im1 to blit on im2
    xp, yp = pos
    x1 = max(0, -xp)
    y1 = max(0, -yp)
    h1, w1 = im1.shape[:2]
    h2, w2 = im2.shape[:2]
    xp2 = min(w2, xp + w1)
    yp2 = min(h2, yp + h1)
    x2 = min(w1, w2 - xp)
    y2 = min(h1, h2 - yp)
    xp1 = max(0, xp)
    yp1 = max(0, yp)

    if (xp1 >= xp2) or (yp1 >= yp2):
        return im2

    blitted = im1[y1:y2, x1:x2]

    new_im2 = +im2

    if mask is None:
        new_im2[yp1:yp2, xp1:xp2] = blitted
    else:
        mask = mask[y1:y2, x1:x2]
        if len(im1.shape) == 3:
            mask = np.dstack(3 * [mask])
        blit_region = new_im2[yp1:yp2, xp1:xp2]
        new_im2[yp1:yp2, xp1:xp2] = (1.0 * mask * blitted + (1.0 - mask) * blit_region)
    
    return new_im2.astype('uint8') if (not ismask) else new_im2


  


  and so, Rotem is right.

  


  new_im2[yp1:yp2, xp1:xp2] = (1.0 * mask * blitted + (1.0 - mask) * blit_region)


  


  is

  


  (alpha * img_rgb + (1.0 - alpha) * bg)


  


  and this is how moviepy composites. And this is why we see black at the edges.

  


• ffmpeg does not sync audio and video recording

  30 avril 2020, par Ferrum3000

  I'm using followig command record mic+speakers+video screen, but in result file screen.avi, video showes +0,5 second early, than sounds.
Please help to fix it.

  



  ffmpeg ^
 -f dshow -i audio="Стерео микшер (Realtek High Definition Audio)" ^
 -f dshow -i audio="Mic in at front panel (Pink) (Realtek High Definition Audio)" ^
 -f gdigrab -framerate 60 -video_size 1920x1080 ^
 -draw_mouse 1 ^
 -i desktop -vcodec libx264 -pix_fmt yuv420p -preset ultrafast ^
 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 2 -map "[a]" ^
 screen.avi