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• ffmpeg sequence of multiple filters syntax

  5 juillet 2021, par otomari

  i am trying to use multiple filters in ffpmeg, but it does not allow more than one -af.
so, then i decided to try to do it with a -complex_filter.

  


  sudo ffmpeg -f alsa -i default:CARD=Device \
  -filter_complex \
  "lowpass=5000,highpass=200; \
   volume=+5dB; \
   afftdn=nr=0.01:nt=w;" \
  -c:a libmp3lame -b:a 128k -ar 48000 -ac 1 -t 00:00:05 -y $recdir/audio_$(date '+%Y_%m_%d_%H_%M_%S').mp3


  


  it must work, but for some reason i get an error :

  


  Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'default:CARD=Device':
  Duration: N/A, start: 1625496748.441207, bitrate: 1536 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[AVFilterGraph @ 0xaaab0a8b14e0] No such filter: ''
Error initializing complex filters.
Invalid argument


  


  i have tried quotes and others, nothing helps..

  


• How to decode Byte string from continous video frames in python

  15 juillet 2021, par fresch man

  i am trying to get PNG from a video stream. first i connect the server during socket, and i recieve presistent byte string. however when i use Pickel ,i get a Error,that is UnpicklingError : invalid load key, '\x10.

  


  i surpose that ,if i should first do someting to the bytestring before i use pickel.or i should use another methode

  


  i have already search in the internet, but all the answers are , open locally video and so ..but my byte string are acctully presistent RAW video frames(yuv420) during tcp transport.

  


  `import socket,os,struct,numpy,pickle
TCP_IP = '192.168.0.90'
TCP_PORT = 5000
BUFFER_SIZE =1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
while True :
        data = s.recv(BUFFER_SIZE)
        data = pickle.loads(data) `


  


  thank you

  


• How to create side by side horizontally stacked video with delay in video and audio using ffmpeg-python ?

  29 juillet 2021, par kup

  I am trying to create a video from two videos that will be stacked horizontally but the resulting video is not what i expected. The same video is appearing on both side (left & right). So wondering how that can be achieved ?

  


  The ffmpeg command i tried, which kinda worked :

  


  ffmpeg -i left.mp4 -i right.mp4 -filter_complex "
[0:v]setpts=PTS-STARTPTS[l]; 
[1:v]setpts=PTS-STARTPTS,tpad=start_duration=14:start_mode=add:color=black[r]; 
[l][r]hstack=inputs=2[stacked]; [0:a][1:a]amix=inputs=2[a]
" -map "[stacked]" -map "[a]" -c:a aac -preset superfast result.mp4


  


  ffmpeg-python script that's not working :

  


  in0 = ffmpeg.input('0.mp4')
in1 = ffmpeg.input('right.mkv')
aout = ffmpeg.filter([in0.audio, in1.audio.filter('adelay', "5000|5000")],'amix')
vout = ffmpeg.filter([inv0.video, inv1.video.filter('tpad', start_duration=5, start_mode='add', color='black')], 'hstack')

(
    ffmpeg
    .concat(vout, aout, v=1, a=1)
    .output("out.mkv")
    .run()
)


  


  This script not resulting in the expected output which two videos side-by-side horizontally stacked.