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• TypeError : __init__() missing 2 required positional arguments : 'stdout' and 'stderr'

  15 février 2024, par mike.w

  I encountered the following error while running a program extract_frame_and_wav_multiprocess.py, which is designed to extract audio and frames from the videos in dataset MSRVTT.
Here is the error message from the program :

  


  (valor) xxx:/VALOR/utils$ python extract_frame_and_wav_multiprocess.py                                                                                                                                                                           
0%|                                       | 0/10005 [00:00<?, ?it/s]
Exception in thread Thread-3:                                                                                                                                                      
Traceback (most recent call last):                                                                                                                                                   
File "/anaconda3/envs/valor/lib/python3.9/threading.py", line 973, in _bootstrap_inner                                                    
self.run()                                                                                                                                                                       
File "/anaconda3/envs/valor/lib/python3.9/threading.py", line 910, in run                                                                                          
self._target(*self._args, **self._kwargs)                                                                                                                                        
File "/anaconda3/envs/valor/lib/python3.9/multiprocessing/pool.py", line 576, in _handle_results                                                                   
task = get()                                                                                                                                                                     
File "/anaconda3/envs/valor/lib/python3.9/multiprocessing/connection.py", line 256, in recv                                                                        
return _ForkingPickler.loads(buf.getbuffer())                                                                                                                                  
TypeError: __init__() missing 2 required positional arguments: 'stdout' and 'stderr'   


  


  This is the location indicated by the error message(in the file /anaconda3/envs/valor/lib/python3.9/multiprocessing/connection.py) :

  


      def recv(self):
        """Receive a (picklable) object"""
        self._check_closed()
        self._check_readable()
        buf = self._recv_bytes()
        return _ForkingPickler.loads(buf.getbuffer())


  


  The following program is the python program extract_frame_and_wav_multiprocess.py being executed :

  


  import os
import os.path as P
import ffmpeg
import json
import tqdm
import numpy as np
import threading
import time
import multiprocessing
from multiprocessing import Pool
import subprocess



### change diffenrent datasets
input_path = '../datasets/msrvtt/raw_videos'
output_path = '../datasets/msrvtt/testt'
data_list = os.listdir(input_path)

def execCmd(cmd):
    r = os.popen(cmd)
    text = r.read()
    r.close()
    return text

def pipline(video_path, video_probe, output_dir, fps, sr, duration_target):
    video_name = os.path.basename(video_path)
    audio_name = video_name.replace(".mp4", ".wav")
    video_name = video_name.replace(".mp4", "")


    #extract video frames fps
    fps_frame_dir = P.join(output_dir, f"frames_fps{fps}", video_name)
    os.makedirs(fps_frame_dir, exist_ok=True)
    cmd = "ffmpeg -loglevel error -i {} -vsync 0 -f image2 -vf fps=fps={:.02f} -qscale:v 2 {}/frame_%04d.jpg".format(
              video_path, fps, fps_frame_dir)
    subprocess.call(cmd, shell=True)

    # Extract Audio
    sr_audio_dir = P.join(output_dir,f"audio_{sr}hz")
    os.makedirs(sr_audio_dir, exist_ok=True)
    audio_file_path = P.join(sr_audio_dir, audio_name)
    cmd = "ffmpeg -i {} -loglevel error -f wav -vn -ac 1 -ab 16k -ar {} -y {}".format(
            video_path, sr, audio_file_path)
    subprocess.call(cmd, shell=True)


def extract_thread(video_id):
    
    video_name = os.path.join(input_path, video_id)
    if not os.path.exists(video_name):
        return
    probe = ffmpeg.probe(video_name)
    pipline(video_name, probe, output_path, fps=4, sr=22050, duration_target=10)


def extract_all(video_ids, thread_num, start):
    length = len(video_ids)
    print(length)
    with Pool(thread_num) as p:
        list(tqdm.tqdm(p.imap(extract_thread, video_ids), total=length))

if __name__=='__main__':
    thread_num = 50
    start = 0

    print(len(data_list))
    extract_all(data_list, thread_num, start)


  


  It's strange that similar errors did not occur when processing the DiDeMo video dataset, but they are encountered when handling the MSRVTT dataset. (Is this related to the fact that the DiDeMo dataset doesn't have audio ?)

  


• Recording transport stream to file in ffmpeg

  9 juillet 2020, par Neil Bernard

  I'm streaming a dvb-t mux and I want to dump it to file using ffmpeg on another PC.

  


  Here is the command :

  


  ffmpeg -i rtp ://192.168.1.93:20000 -acodec copy -vcodec copy d34_tw.ts

  


  For some reason though its only saving 1 video and 1 audio random pid ? not the whole TS ?

  


  Thoughts ?

  


  Neil

  


• simple hls server - Streaming from local NAS

  18 juillet 2020, par Neil Bernard

  I'm using FFMPEG to stream to a synology NAS, I cant open the files in VLC over the network. I assume its some sort of CIFS/SMB thing (edit : I think its actually the paths in the .m38u file). I don't really want to setup a nginx server. This is for local use.

  


  Any thoughts on a lightweight solution ?

  


  Cheers in advance

  


  Neil