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• How can I start ffmpeg while playing a full screen game ?

  11 janvier 2021, par Muhamed Shair benshair

  This is a class of the ffmpeg :

  


  using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Threading.Tasks;  
using System.IO;  
using System.Diagnostics;  
  
namespace Ffmpeg_App  
{  
    class Ffmpeg  
    {  
        Process process;  
  
        public void Start(string FileName, int Framerate)  
        {  
            process = new System.Diagnostics.Process();  
            process.StartInfo.FileName = @"D:\ffmpegx86\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
            process.EnableRaisingEvents = false;  
            process.StartInfo.WorkingDirectory = @"D:\ffmpegx86"; // The output directory  
            process.StartInfo.Arguments = @"-f gdigrab -framerate " + Framerate + " -i desktop -preset ultrafast -                                                                     pix_fmt yuv420p " + FileName;  
            process.Start();  
            process.StartInfo.UseShellExecute = false;  
            process.StartInfo.CreateNoWindow = false;  
            Close();  
        }  
  
        public void Close()  
        {  
            process.Close();  
        }  
    }  
}  


  


  And in form1 :

  


  At the top :

  


  Ffmpeg fmpeg = new Ffmpeg();


  


  In a button click event :
To start :

  


  private void Start_Click(object sender, EventArgs e)  
        {  
            fmpeg.Start("test.mp4", 24);  
        }


  


  and to stop :

  


  private void Stop_Click(object sender, EventArgs e)  
        {  
            fmpeg.Close();  
        }


  


  The problem is when I'm in full screen game I don't have access to the form and the buttons they are hidden in the background.

  


  I need to make some global keys hook maybe ?

  


• Matplotlib use Ffmpeg to save plot to be mp4 not include full step

  21 décembre 2020, par 昌翰余

  I use ffmpeg to store the dynamic graph drawn on matplotlib, but the output file is only 2 seconds
but It should have been 30 seconds.
I set a graph to run three curves, a total of 30 seconds of data,
the graph that ran on the py file is normal,
but the output is only the first two seconds of the output.
May I ask if I missed something

  


  Below is my code

  


  import matplotlib.pyplot as plt
from matplotlib import animation
from numpy import random 
import pandas as pd
from matplotlib.animation import FFMpegWriter

FFwriter=animation.FFMpegWriter(fps=30, extra_args=['-vcodec', 'libx264'])
data = pd.read_csv('apple1.csv', delimiter = ',', dtype = None)
data = data.values
AccX1=[]
AccY1=[]
AccZ1=[]
AccX2=[]
AccY2=[]
AccZ2=[]

time = []

for i in range(600):
        AccX1.append(data[i][8])
        AccY1.append(data[i][9])
        AccZ1.append(data[i][10])
        AccX2.append(data[i][24])
        AccY2.append(data[i][25])
        AccZ2.append(data[i][26])
        
        time.append(data[i][0])
        
fig = plt.figure()
ax1 = plt.axes(xlim=(0,3000), ylim=(6,-6))
line, = ax1.plot([], [], lw=2)
plt.xlabel('ACC')
plt.ylabel('Time')

plotlays, plotcols = [3], ["r","g","b"]
lines = []
for index in range(3):
    lobj = ax1.plot([],[],lw=2,color=plotcols[index])[0]
    lines.append(lobj)


def init():
    for line in lines:
        line.set_data([],[])
    return lines

x1,y1 = [],[]
x2,y2 = [],[]
x3,y3 = [],[]



i=0

def animate(frame):
    global i
    
    i+=1
    x = i
    y = AccX1[i]

    x1.append(x)
    y1.append(y)

    x = i
    y = AccY1[i]
    x2.append(x)
    y2.append(y)

    x = i
    y = AccZ1[i]
    x3.append(x)
    y3.append(y)
    

    xlist = [x1, x2,x3]
    ylist = [y1, y2,y3]


    for lnum,line in enumerate(lines):
        line.set_data(xlist[lnum], ylist[lnum]) 


    return lines


anim = animation.FuncAnimation(fig, animate,
                    init_func=init, blit=True,interval=10)
anim.save('test.mp4',writer=FFwriter)
plt.show()


  


  The dynamic picture ran out using plt.show is correct.
And I don't think I have set the length of storage. Did I add something ?

  


• swscale/utils : override forced-zero formats back to full range

  10 octobre 2020, par Jan Ekström

  swscale/utils : override forced-zero formats back to full range
  Fixes vf_scale outputting RGB AVFrames with limited range flagged
  
  in case either input or output specifically sets the range.
  This is the reverse of the logic utilized for RGB and PAL8 content
  
  in sws_setColorspaceDetails.
  

  • [DH] libswscale/utils.c