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• Broken pipe when writing video file with moviepy in azure [closed]

  5 juin 2024, par Lydia

  I have a program that retrieves images (png) and audio files from Azure Blob Storage to merge them into a video, which is then written to a temporary file and saved back to Blob Storage. I'm coding in **Python **and here is the function I use from MoviePy :
final_clip.write_videofile(temp_file_name, fps=24, codec='libx264', audio_codec='mp3')
I have containerized my code, and the **Docker **image works perfectly on my machine. However, once deployed on Azure, I encounter this problem with writing the video :

  


  Failed: [Errno 32] Broken pipe MoviePy error: FFMPEG encountered the following error while writing file /tmp/tmp81o22bka.mp4: b'' Traceback (most recent call last): File "/usr/local/lib/python3.8/site-packages/moviepy/video/io/ffmpeg_writer.py", line 136, in write_frame self.proc.stdin.write(img_array.tobytes()) BrokenPipeError: [Errno 32] Broken pipe During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/site/wwwroot/function_app.py", line 102, in generate_simple_video image_clip.write_videofile(temp_file_name, fps=24) File "", line 2, in write_videofile File "/usr/local/lib/python3.8/site-packages/moviepy/decorators.py", line 54, in requires_duration return f(clip, *a, **k) File "", line 2, in write_videofile File "/usr/local/lib/python3.8/site-packages/moviepy/decorators.py", line 135, in use_clip_fps_by_default return f(clip, *new_a, **new_kw) File "", line 2, in write_videofile File "/usr/local/lib/python3.8/site-packages/moviepy/decorators.py", line 22, in convert_masks_to_RGB return f(clip, *a, **k) File "/usr/local/lib/python3.8/site-packages/moviepy/video/VideoClip.py", line 300, in write_videofile ffmpeg_write_video(self, filename, fps, codec, File "/usr/local/lib/python3.8/site-packages/moviepy/video/io/ffmpeg_writer.py", line 228, in ffmpeg_write_video writer.write_frame(frame) File "/usr/local/lib/python3.8/site-packages/moviepy/video/io/ffmpeg_writer.py", line 180, in write_frame raise IOError(error) OSError: [Errno 32] Broken pipe MoviePy error: FFMPEG encountered the following error while writing file /tmp/tmp81o22bka.mp4: b''


  


  From my online research, everyone suggests that it’s a resource issue (lack of RAM and CPU). I increased these resources in the Azure Function App configuration, but I still face the same problem.

  


  I took a step-by-step approach to check for compatibility issues with the MoviePy function. I created a small 30-second video without audio, and it worked. Then, I added more options such as more images, audio, etc., but it failed.

  


  I suspected a timeout issue, but even with an execution time of one minute only, it still fails.

  


  I am out of ideas to test and really need help.

  


  Thank you in advance.

  


• How to pipe in and pipe out of ffmpeg in python ? [closed]

  22 mai 2024, par sa_penguin

  I want to use ffmpeg as a middleman to perform a functionality. The camera frames will be read through opencv and passed to ffmpeg for processing. FFMPEG need to pass the processed frames to opencv for displaying. Below is what I tried. The code hangs and is not displaying anything. Any help will be appreciated.

  


  import cv2
import math
import subprocess as sp

import ffmpeg
import numpy as np


def main():
    cap = cv2.VideoCapture(0)
    if not cap.isOpened():
        print("Camera can't open\nexit")
        return -1
    width = 640
    height = 480
    fps = 30

out = process = (
        ffmpeg
        .input('pipe:', vsync=0, hwaccel='cuda', hwaccel_output_format='cuda', format='rawvideo', pix_fmt='bgr24', s=f'{width}x{height}', r=f'{fps}')
        .filter('setsar', sar=1)  # Keep the aspect ratio
        .output('pipe:', format='rawvideo', pix_fmt='bgr24')
        .run_async(pipe_stdin=True, pipe_stdout=True)
)

while True:
    success, frame = cap.read()
    img = cv2.cvtColor(frame, cv2.COLOR_BayerBG2BGR)
    process.stdin.write(img.tobytes())

    arr = np.frombuffer(process.stdout.read(width*height*3), dtype=np.uint8)
    cv2.imshow("webcam",arr))
    cv2.waitKey(0)


if __name__ == "__main__":
    main()


  


• pylwdrone and ffmpeg-python : pipe:0 : Invalid data found when processing input [closed]

  8 mai 2024, par Saail Chavan

  I am using a lewei camera on my drone and i have managed to get the stream using https://github.com/meekworth/pylwdrone, i want to do basic image processing like face or object detection or qr code scan which i am unable to do

  


  when i use this command in terminal :

  


  $ pylwdrone stream start --out-file - | ffplay -i -fflags nobuffer -flags low_delay -probesize 32 -sync ext -


  


  i get a clear feed with no errors

  


  enter image description here

  


  When i am using the script in python i am getting errors and the feed is bit lagged and skips frames

  


  pipe:0: Invalid data found when processing input


  


  ERROR :

  


  

  


  import cv2
import numpy as np
import pylwdrone
import ffmpeg
import sys

drone = pylwdrone.LWDrone()
drone.set_time()

window_name = 'Drone Video Stream'
cv2.namedWindow(window_name, cv2.WINDOW_NORMAL)

for packet in drone.start_video_stream():
    try:

        out, _ = (
            ffmpeg.input('pipe:0')
            .output('pipe:', format='rawvideo', pix_fmt='bgr24')
            .run(input=packet.frame_bytes, capture_stdout=True, capture_stderr=True)
        )
        frame = np.frombuffer(out, np.uint8)
        height, width = 1152, 2048
        frame = frame.reshape((height, width, 3))


        # Display video stream
        cv2.imshow(window_name, frame)

        # Check for 'q' key to exit
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

    except ffmpeg.Error as e:
        print('An error occurred:', e.stderr.decode(), file=sys.stderr)

cv2.destroyAllWindows()
drone.stop_video_stream()