Recherche avancée

Sur d’autres sites (13443)

• avcodec/dynamic_hdr_vivid : fix base_enable_flag control

  17 mars 2023, par Zhao Zhili

  avcodec/dynamic_hdr_vivid : fix base_enable_flag control
  The base_enable_flag is parallel to three_Spline_enable_flag. The
  
  typesetting of the specification is very misleading.
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/dynamic_hdr_vivid.c

• FFMPEG control delay and looping for generating APNG

  24 septembre 2020, par fmw42

  I have a (random selection) of JPG images that I want to use to make into an APNG animation using ffmpeg (to test the process). They are all the same dimensions (256x256). But I cannot seem to get the correct syntax to control the frame delay and loop control (to loop forever). Is it possible to set these parameters using ffmpeg when creating an APNG from a sequence of images ? If so, can someone provide the proper syntax and/or show an example command ? I have searched the ffmpeg documentation and cannot seem to find relevant syntax.

  


  I can do the following, but it will not accept -delay nor -loop. I use Imagemagick to pipe in the images.

  


  This works, but does not loop, and runs very fast.

  


  magick lena.jpg mandril3.jpg monet2.jpg zelda1.jpg PNG:- | ffmpeg -i - x.apng


  

  


  This gives errors about delay and/or loop :

  


  magick lena.jpg mandril3.jpg monet2.jpg zelda1.jpg PNG:- | ffmpeg -i - -delay 1000 -loop -1 x.apng


  

  


  I am also curious to know if it is possible to specify a sequence of images directly in ffmpeg as input without using ImageMagick.

  


  Sorry, I am a relative novice with ffmpeg. I am using ffmpeg 4.2.1.

  


• I cant save the animation

  17 mai 2021, par Gokul

  i tried various examples though i cant find proper solution. This is the example code of my project i want to save this in a mp4 format and i used ffmpeg. Any suggestion for this would be appreciated. Thank you in advance

  


  import pandas as pd
import numpy as np
import ma``tplotlib.pyplot as plt
import matplotlib.animation as animation

df = data.iloc[0:250, 4:12]
df1 = df2.iloc[:,0:3]

a1 = df.iloc[:,0]/2
a2 = df.iloc[:,1]/2
b1 = df.iloc[:,2]/2
b2 = df.iloc[:,3]/2
c1 = df.iloc[:,4]/2
c2 = df.iloc[:,5]/2
m1 = df1.iloc[:,0]
m2 = df1.iloc[:,1]
m3 = df1.iloc[:,2]

fig ,ax = plt.subplots()

l1, = ax.plot (vert1, vert2, 'ro', markersize = m1[0])
l2, = ax.plot (long1, long2, 'ro', markersize = m2[0])
l3, = ax.plot (tras1, tras2, 'ro', markersize = m3[0])

def init():    
    l1.set_data([],[])
    l2.set_data([],[])
    l3.set_data([],[])
    
    return (l1,l2,l3)

def animate(i,l1,l2,l3):
    
    l1.set_data(vert1[i], vert2[i])
    l1.set_markersize(m1[i])
    l2.set_data(long1[i], long2[i])
    l2.set_markersize(m2[i])
    l3.set_data(tras1[i], tras2[i])
    l3.set_markersize(m3[i])

    return (l1,l2,l3)

Writer = animation.writers['ffmpeg']
writer = Writer(fps= 100, metadata = dict(artist = 'me'), bitrate = 1800)

ani = animation.FuncAnimation(fig, animate, fargs=(l1,l2,l3), init_func=init, interval=10, blit=False)
ani.save('/Users/gokulthangavel/Downloads/basic_animation.mp4', writer = writer)

plt.show()