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• Audio in ffmpeg

  1er octobre 2020, par Konduri Sai Aditya

  I need to add audio as an input to below command, How can I achieve it

  


  ffmpeg -i test.png -i test.mp4 -y -filter_complex "[1:v]scale=1422:800[scale1],[scale1]rotate=0:c=black@0:ow=rotw(0):oh=roth(0)[rotate0],[0:v][rotate0]overlay=258.04:107.71[mediaoverlayout0],color=black@0:451x137[c1],[c1]setsar=1,drawtext=fontfile='/Windows/fonts/Peddana-Regular.ttf':text='ADITYA':fontsize=121.19999999999999:fontcolor=#1e8bc3:line_spacing=16.91,rotate=0:ow=rotw(0):oh=roth(0):c=black@0[rottext1],[mediaoverlayout0][rottext1]overlay=x=544.63:y=263.076:shortest=1" -pix_fmt yuv420p op.mp4


  


• conversion from YUV to RGB color

  13 avril 2024, par Prashant

  I'm trying to convert FFMPEG's Intensity color map from yuv format to rgb. It should give you colors as shown in the color bar in the image. You can generate a spectrogram using command :

  


  ffmpeg -i words.wav -lavfi showspectrumpic=s=224x224:mode=separate:color=intensity spectrogram.png


  


  

  


  Here is the code :

  


  import numpy as np

def rgb_from_yuv(Y, U, V):

    Y -= 16
    U -= 128
    V -= 128
    R = 1.164 * Y + 1.596 * V
    G = 1.164 * Y - 0.392 * U - 0.813 * V
    B = 1.164 * Y + 2.017 * U
  
    # Clip and normalize RGB values
    R = np.clip(R, 0, 255)
    G = np.clip(G, 0, 255)
    B = np.clip(B, 0, 255)
  
    return '#{:02X}{:02X}{:02X}'.format(int(R), int(G), int(B))

def yuv_to_rgb(Y, U,V):
    # Convert YUV to RGB
    R  = Y + (V - 128) *  1.40200
    G  = Y + (U - 128) * -0.34414 + (V - 128) * -0.71414
    B  = Y + (U - 128) *  1.77200

    # Clip and normalize RGB values
    R = np.clip(R, 0, 255)
    G = np.clip(G, 0, 255)
    B = np.clip(B, 0, 255)
    
    print(R,G,B)
    
    return '#{:02X}{:02X}{:02X}'.format(int(R), int(G), int(B))

# FFMPEG's intensity color map
colors = [
    [    0,                  0,                  0,                   0 ],
    [ 0.13, .03587126228984074,  .1573300977624594, -.02548747583751842 ],
    [ 0.30, .18572281794568020,  .1772436246393981,  .17475554840414750 ],
    [ 0.60, .28184980583656130, -.1593064119945782,  .47132074554608920 ],
    [ 0.73, .65830621175547810, -.3716070802232764,  .24352759331252930 ],
    [ 0.78, .76318535758242900, -.4307467689263783,  .16866496622310430 ],
    [ 0.91, .95336363636363640, -.2045454545454546,  .03313636363636363 ],
    [    1,                  1,                  0,                   0 ]]
    
cmaps = []
for i, c in enumerate(colors):
    Y = c[1]
    U = c[2]
    V = c[3]

    hex = yuv_to_rgb(Y,U,V)

    cmaps.append((c[0], hex))    
print(cmaps)


  


  Both the functions are not providing desired output.

  


• How to rpt stream between two different Laptop [closed]

  19 février 2024, par Faruk

  I want make some test for rtp. I connected Ubuntu Laptop and Windows Laptop with ethernet cable. I want to stream from one computer and run it with VLC from the other.

  


  I did two test for this :

  


  First test(on Ubuntu)

  


  

  1. I streamed with this command : ffmpeg -re -i ~/Videos/test.mp3 -acodec pcm_s16be -ar 44100 -ac 2 -payload_type 10 -f rtp rtp://127.0.0.1:8080

  


  2. I started VLC on Ubuntu and I enter rtp://127.0.0.1:8080 to Open Network Stream

  


  


  This worked.

  


  Second Test

  


  

  1. I connected two Laptops via ethernet cable. Main laptop is Ubuntu and the other one windows.

  


  2. Windows laptop IP address is : 10.42.0.167 (I tested internet and windows laptop can connect to internet)

  


  3. I streamed with this command : ffmpeg -re -i ~/Videos/test.mp3 -acodec pcm_s16be -ar 44100 -ac 2 -payload_type 10 -f rtp rtp://10.42.0.167:8080

  


  4. I checked data on Ubuntu with Wireshark and data is going. I did this test on Windows laptop and data is coming.

  


  5. I started VLC on Windows laptop and I enter rtp://10.42.0.167:8080 to Open Network Stream but VLC can nor play stream audio.

  


  


  What is the reason why the stream can not play on VLC that a Windows laptop even though data is received ?

  


  How can I achieve this ?

  


  Thanks.