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• Failed to add audio to mp4 with moviepy

  24 avril, par D G

  I generated an audio sound.wav and a video temp.mp4 that makes use of the audio. Both with the same duration.

  


  I got the following warning when generating the temp.mp4. The animation is out of sync, it means that it freezes before the audio finishes.

  


  


  .venv\Lib\site-packages\moviepy\video\io\ffmpeg_reader.py:178 : UserWarning : In file temp.mp4, 1080000 bytes wanted but 0
bytes read at frame index 299 (out of a total 300 frames), at time 4.98/5.00 sec. Using the last valid frame instead.
warnings.warn(

  


  


  Complete code :

  


  # to generate sound.wav
import numpy as np
import soundfile as sf
from tqdm import tqdm
from os import startfile

# Parameters
filename = "sound.wav"
duration = 5  # seconds
num_voices = 1000
sample_rate = 44100  # Hz
chunk_size = sample_rate  # write in 1-second chunks


t = np.linspace(0, duration, int(sample_rate * duration), endpoint=False)

# Create many detuned sine waves (Deep Note style)
start_freqs = np.random.uniform(100, 400, num_voices)
end_freqs = np.linspace(400, 800, num_voices)  # target harmony

# Each voice sweeps from start to end frequency
signal = np.zeros_like(t)
for i in range(num_voices):
    freqs = np.linspace(start_freqs[i], end_freqs[i], t.size)
    voice = np.sin(2 * np.pi * freqs * t)
    voice *= np.sin(np.pi * i / num_voices)  # slight variance
    signal += voice

# Volume envelope
envelope = np.linspace(0.01, 1.0, t.size)
signal *= envelope

# Normalize
signal /= np.max(np.abs(signal))

# Save with progress bar using soundfile
with sf.SoundFile(
    filename, "w", samplerate=sample_rate, channels=1, subtype="PCM_16"
) as f:
    for i in tqdm(range(0, len(signal), chunk_size), desc=f"Saving {filename}"):
        f.write(signal[i : i + chunk_size])


startfile(filename)


  


  # to generate temp.mp4
from numpy import pi, sin, cos
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
from os import startfile
from tqdm import tqdm
from moviepy import VideoFileClip, AudioFileClip, CompositeAudioClip

# Output settings
filename = "temp.mp4"
duration = 5  # seconds of animation
maxdim = 4  # canvas size in plot units (scaled)
fps = 60

# Real-world parameters
r = 40  # km (radius)
endtime = 2  # hours (duration of real motion)
rph = 0.5  # rotations per hour
omega = 2 * pi * rph  # rad/hour
speed = omega * r  # km/hour

# Animation setup
frames = duration * fps
scale = maxdim / r  # scale from km to plot units
dt = endtime / frames  # time per frame in hours

# Prepare figure and axes
fig, ax = plt.subplots(figsize=(6, 6))
ax.set_xlim(-maxdim - 1, maxdim + 1)
ax.set_ylim(-maxdim - 1, maxdim + 1)
ax.set_aspect("equal")
ax.grid()



# Plot circle path
circle = plt.Circle((0, 0), r * scale, color="lightgray", fill=False, linestyle="--")
ax.add_patch(circle)

# Moving point
(point,) = ax.plot([], [], "ro")

# Info text at center of the circle
info_text = ax.text(
    0, 0, "", fontsize=10,
    ha="center", va="center",
    bbox=dict(boxstyle="round,pad=0.4", facecolor="white", alpha=0.8)
)


def init():
    point.set_data([], [])
    info_text.set_text("")
    return point, info_text


def update(frame):
    t = frame * dt  # time in hours
    theta = omega * t  # angle in radians

    x = r * cos(theta) * scale
    y = r * sin(theta) * scale

    point.set_data([x], [y])
    info_text.set_text(
        f"Time: {t:.2f} hr\nRadius: {r:.1f} km\nSpeed: {speed:.2f} km/h"
    )
    return point, info_text



# Create animation
anim = FuncAnimation(
    fig, update, frames=frames, init_func=init, blit=True, interval=1000 / fps
)


with tqdm(total=frames, desc="Saving", unit="frame") as pbar:
    anim.save(filename, fps=fps, progress_callback=lambda i, n: pbar.update(1))

# Add sound using MoviePy
video = VideoFileClip(filename)
video.audio = CompositeAudioClip([AudioFileClip("sound.wav")])
video.write_videofile(filename)

startfile(filename)


  


  Could you figure out what the culprit is and how to fix it ?

  


  

  


  Edit

  


  Based on the given comment, I did the following but the problem still exists.

  


  # Add sound using MoviePy
video = VideoFileClip(filename)
audio = AudioFileClip("sound.wav")
audio.duration = video.duration
video.audio = CompositeAudioClip([audio])
video.write_videofile(filename)


  


• lavd/x11grab : fix vertical repositioning

  28 mars 2019, par Octavio Alvarez

  lavd/x11grab : fix vertical repositioning
  There is a calculation error in xcbgrab_reposition() that breaks
  
  vertical repositioning on follow_mouse. It made the bottom
  
  reposition occur when moving the mouse lower than N pixels after
  
  the capture bottom edge, instead of before.
  This commit fixes the calculation to match the documentation.
  follow_mouse : centered or number of pixels. The documentation says :
  When it is specified with "centered", the grabbing region follows
  
  the mouse pointer and keeps the pointer at the center of region ;
  
  otherwise, the region follows only when the mouse pointer reaches
  
  within PIXELS (greater than zero) to the edge of region.
  

  • [DH] libavdevice/xcbgrab.c

• Anomalie #3108 : filtre image inactif sur boucle + liaison

  14 décembre 2013, par b b

  Alors, après réflexion... je ne suis pas certain que ça soit un bug :p

  La balise #FICHIER bénéficie d’un traitement spécifique lorsqu’elle est utilisée dans une boucle DOCUMENTS cf (merci à denisb pour l’info) :

  http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/medias/base/medias.php#L40

  Mais dans ton cas on est dans une boucle ARTICLES, et il faudrait donc utiliser la balise #LOGO_DOCUMENT comme ce ci :

  [(#LOGO_DOCUMENT**|image_reduire500,0|image_recadre280,177,center)]

  Deux solutions :

  - soit on précise dans la doc que la balise #FICHIER est "obsolète" (sauf dans une boucle DOCUMENTS), et qu’il faut passer par #LOGO_DOCUMENT**
  - soit on généralise le traitement sur la balise #FICHIER à toutes les boucles (au risque de péter les champs FICHIER sur d’autres tables).