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• I cant save the animation in ffmpeg

  22 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. the animation was saved if I use df = pd.DataFrame(np.random.rand(250,3)) but it is not working for my sample code, it showed key error = 0. Note : df1 = pd.DataFrame(np.random.randint(5,15,[250,3])).
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()


  


• How can I use ffmpeg to save only the last 60 secs recorded ?

  14 septembre 2021, par Marc Khoury

  I'm trying to figure out a way to use ffmpeg command to save only the last 60 seconds recorded.
The way I'm doing it now is using a thread to record 60 seconds videos, and then merge the last two videos and cut the last 60 seconds (using the -t command), the method I'm trying to achieve should not save multiple videos and then merge and cut.

  


  Below the command I'm using :

  


  ffmpeg -sseof 60 -i "\PATH\TO\VIDEO" -c copy "\PATH\TO\OUTPUT"

  


• Save Gstreamer stream at Windows side [closed]

  18 février 2013, par user1336117

  I am streaming video from webcam from linux via gstreamer as below :

  gst-launch -v v4l2src device=/dev/video0 ! videorate  ! video/x-raw-yuv, width=320, height=240, framerate=5/1  ! videobalance saturation=0.0 ! jpegenc ! multipartmux ! tcpserversink host=192.168.10.24 port=5000

  I can see the stream via VLC

  tcp://192.168.10.67:5000

  As the next step I want to save it as a video file but I could not succeeded.
  I tried to setup gstreamer to windows but it did not worked.
  I tried to save the stream by using ffmpeg on windows side but it did not worked.

  ffmpeg -i tcp://192.168.10.67:5000 -map 0 deneme.flv

  What should I do to be able to save the stream on windows side ?