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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"

  


• Using FFmpeg AutoGen save to bitmap works on Windows but not on Linux

  5 décembre 2024, par Chris

  I'm using FFmpeg.AutoGen to decrypt video and save the frames as bitmaps. Code is using dotnet core and I'd like to get it working for both Windows and Linux.

  


  The code is similar to the example provided : https://github.com/Ruslan-B/FFmpeg.AutoGen/blob/db9bcd4b9dfad5d117ffd71fe1a2d073e96a3520/FFmpeg.AutoGen.Example/Program.cs

  


  AVFrame convertedFrame = this.converter.Convert(frame);
Bitmap image = new Bitmap(convertedFrame.width, convertedFrame.height, convertedFrame.linesize[0], PixelFormat.Format24bppRgb, (IntPtr)convertedFrame.data[0]);


  


  When saving the image using :

  


  image.Save($"returned-image-{DateTime.Now.Ticks}.png", ImageFormat.Bmp);


  


  The image looks fine on Windows, but is corrupted in Linux.