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• How to overlay and save a video with gif in Android ?

  5 avril 2017, par mr nooby noob

  I currently am able to display a gif while recording a video, however when the video is saved it does not display the gif.

  One hacky solution that I thought of is that I simply could just record the screen while recording and save that file instead, however there are some issues that I have with this, ie the audio quality and other items on the screen being saved, such as the video buttons, etc.

  How can I use something like FFMPEG, or anything else that, to save a gif overlay while recording a video ?

• 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()


  


• avcodec/rv34 : Don't needlessly copy VLC length and symbol arrays

  22 octobre 2020, par Andreas Rheinhardt

  avcodec/rv34 : Don't needlessly copy VLC length and symbol arrays
  Most of the VLCs used by RealVideo 3 and 4 obey three simple rules :
  
  Shorter codes are on the left of the tree, for each length, the symbols
  
  are ascending from left to right and the symbols either form a
  
  permutation of 1..size or 0..(size - 1). For the latter case, one just
  
  needs to store the length of each symbol and create the codes according
  
  to the other rules ; no explicit code or symbol array must be stored.
  
  The former case is also treated in much the same way by artificially
  
  assigning a length of zero to the symbol 0 ; when a length of zero was
  
  encountered, the element was ignored except that the symbol counter was
  
  still incremented. If the length was nonzero, the symbol would be
  
  assigned via the symbol counter and the length copied over into a new
  
  array.
  Yet this is unnecessary, as ff_init_vlc_sparse() follows exactly the
  
  same pattern : If a length of zero is encountered, the element is ignored
  
  and only the symbol counter incremented. So one can directly forward the
  
  length array and also need not create a symbol table oneself, because
  
  ff_init_vlc_sparse() will infer the same symbol table in this case.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/rv34.c