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• How to concatenate variables and strings as a full path for the "output file" of an ffmpeg command in a bash script

  12 mai 2022, par djspatule

  I'm trying to learn to bash scripting and I tried to use variables and arguments, etc. to specify a complex output file name to a ffmpeg command as follows :

  


  for file in "$1"/*; do
    #get the name of each file in the directory (without the path nor the extension)
    filename=$(basename $file .mp3)
    #use mimic for Text To Speech. Difficult to install but good and natural voices.
    ~/Desktop/mimic1/mimic -t "$filename" -o $1/wavefile.wav
    #converts the wav file outputed by mimic into mp3
    ffmpeg -i $1/wavefile.wav -f mp3 "${1}/${filename} (title).mp3"
done



  


  But the "${1}/${filename} (title).mp3" part in particular really doesn't seem to work...

  


  Indeed, if I run script.sh ./, I get a file called (title).mp3

  


  Can you help me figure out what it is I'm doing wrong ?
Thanks a million in advance.
Best,

  


  P.S. : i also get earlier in the terminal's output basename: extra operand ‘.mp3’...like my whole code is wrong....?

  


• Flask app using OpenCv crash when i start recording

  17 mai 2023, par Mulham Darwish

  I build this flask app to live stream security cameras and the live stream works with the screenshot function but when start recording it crash but few times same code it worked and saved the video here the code. with the html file using js.

  


  from flask import Flask, render_template, Response, request
import cv2
import os
import time
import threading
import requests

app = Flask(__name__)

# Define the IP cameras
cameras = [
    {'url': 'rtsp://****:*****@******', 'name': 'Camera 1'},
    {'url': 'rtsp://****:*****@******', 'name': 'Camera 2'},
    {'url': 'rtsp://****:*****@******', 'name': 'Camera 3'},
    {'url': 'rtsp://****:*****@******', 'name': 'Camera 4'}
]

# Create a VideoCapture object for each camera
capture_objs = [cv2.VideoCapture(cam['url']) for cam in cameras]
stop_events = {i: threading.Event() for i in range(len(cameras))}
# Define the directory to save the recorded videos
recording_dir = os.path.join(os.getcwd(), 'recordings')

# Ensure the recording directory exists
if not os.path.exists(recording_dir):
    os.makedirs(recording_dir)

# Define the function to capture and save a video
def record_video(camera_index, stop_recording):
    # Define the codec and file extension
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    file_extension = '.mp4'

    # Get the current timestamp for the filename
    timestamp = time.strftime("%Y%m%d-%H%M%S")

    # Define the filename and path
    filename = f'{cameras[camera_index]["name"]}_{timestamp}{file_extension}'
    filepath = os.path.join(recording_dir, filename)

    # Create a VideoWriter object to save the video
    width = int(capture_objs[camera_index].get(cv2.CAP_PROP_FRAME_WIDTH))
    height = int(capture_objs[camera_index].get(cv2.CAP_PROP_FRAME_HEIGHT))
    fps = int(capture_objs[camera_index].get(cv2.CAP_PROP_FPS))
    video_writer = cv2.VideoWriter(filepath, fourcc, fps, (width, height))

    # Capture frames and write them to the file
    while True:
        if stop_recording.is_set():
            break  # stop recording if stop_recording is set
        ret, frame = capture_objs[camera_index].read()
        if ret:
            video_writer.write(frame)
        else:
            break

    # Release the VideoWriter object and the VideoCapture object
    video_writer.release()
    capture_objs[camera_index].release()

@app.route('/')
def index():
    # Render the index page with the list of cameras
    return render_template('index.html', cameras=cameras)

def generate(camera_index):
    # Generate frames from the video feed
    while True:
        ret, frame = capture_objs[camera_index].read()
        if not ret:
            break

        # Encode the frame as JPEG
        _, jpeg = cv2.imencode('.jpg', frame)

        # Yield the frame as a Flask response
        yield (b'--frame\r\n'
               b'Content-Type: image/jpeg\r\n\r\n' + jpeg.tobytes() + b'\r\n')

@app.route('/video_feed')
def video_feed():
    # Get the camera index from the request arguments
    camera_index = int(request.args.get('camera_index'))

    # Generate the video feed
    return Response(generate(camera_index),
                    mimetype='multipart/x-mixed-replace; boundary=frame')

@app.route('/record', methods=['POST'])
def record():
    # Get the camera index from the request form
    camera_index = int(request.form['camera_index'])

    stop_recording = stop_events[camera_index]  # get the stop_recording event for the camera
    thread = threading.Thread(target=record_video, args=(camera_index, stop_recording))
    thread.start()  # start a thread to record video

    # Return a response indicating that the recording has started
    return 'Recording started.'

@app.route('/stop_record', methods=['POST'])
def stop_record():
    # Get the camera index from the request form
    camera_index = int(request.form['camera_index'])

    # Set the stop_recording event for the corresponding camera thread
    stop_events[camera_index].set()

    # Return a response indicating that recording has been stopped
    return 'Recording stopped.'

@app.route('/screenshot', methods=['POST'])
def take_screenshot():
    # Take a screenshot of the video stream and save it as a file
    camera = capture_objs[int(request.form['camera_id'])]
    success, frame = camera.read()
    if success:
        timestamp = time.strftime("%Y%m%d-%H%M%S")
        filename = f'screenshot_{timestamp}.jpg'
        cv2.imwrite(filename, frame)
        return 'Screenshot taken and saved'
    else:
        return 'Failed to take screenshot'

if __name__ == '__main__':
    app.run()


  


  I tried to update ffmpeg to the latest version and installed pip install opencv-python-headless and installed pip install opencv-python but most of the time i come to this crash code

  


  * Serving Flask app 'run'
* Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:5000
Press CTRL+C to quit
127.0.0.1 - - [17/May/2023 13:24:11] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:11] "GET /video_feed?camera_index=0 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:11] "GET /video_feed?camera_index=1 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:11] "GET /video_feed?camera_index=2 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:11] "GET /video_feed?camera_index=3 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:44] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:45] "GET /video_feed?camera_index=3 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:45] "GET /video_feed?camera_index=0 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:45] "GET /video_feed?camera_index=1 HTTP/1.1" 200 -
127.0.0.1 - - [17/May/2023 13:24:45] "GET /video_feed?camera_index=2 HTTP/1.1" 200 -
[h264 @ 0x5605285fc5c0] error while decoding MB 28 29, bytestream -9
[h264 @ 0x560529110040] error while decoding MB 15 37, bytestream -6
[h264 @ 0x560528624980] error while decoding MB 45 45, bytestream -23
[h264 @ 0x5605286f1900] error while decoding MB 50 34, bytestream -7
[h264 @ 0x5605285fc5c0] error while decoding MB 25 9, bytestream -17
[h264 @ 0x5605292b0080] error while decoding MB 28 41, bytestream -5
[h264 @ 0x560528660040] error while decoding MB 101 45, bytestream -17
[h264 @ 0x5605285fc5c0] error while decoding MB 42 44, bytestream -5
[h264 @ 0x5605286f1900] error while decoding MB 118 42, bytestream -9
[h264 @ 0x560529110040] error while decoding MB 92 43, bytestream -5
[h264 @ 0x560528660040] error while decoding MB 99 34, bytestream -11
[h264 @ 0x56052932b0c0] error while decoding MB 92 36, bytestream -13
[h264 @ 0x560528667ac0] error while decoding MB 44 54, bytestream -5
[h264 @ 0x560529110040] error while decoding MB 93 33, bytestream -7
[h264 @ 0x5605286dd880] error while decoding MB 27 37, bytestream -19
[h264 @ 0x560528660040] error while decoding MB 66 56, bytestream -9
127.0.0.1 - - [17/May/2023 13:36:45] "POST /record HTTP/1.1" 200 -
Assertion fctx->async_lock failed at libavcodec/pthread_frame.c:175
Aborted (core dumped)


  


• Windows 2003 using php popen "start /b" because of executing ffmpeg.exe

  1er juillet 2013, par Oh Seung Kwon

  I have some problem.

  There is a php code that convert audio(wav) to mp3 file with using ffmpeg.exe.

  Here is some code.

  $cmd = "./inc/ffmpeg.exe -i ".$file_name." -acodec mp3 -y -ac 1 -ab 96k ".$mp3_file_name;
  
  
  
  echo $cmd;
  
  echo "Windows";
  
  $handle = popen("start /B ".$cmd, "r");
  
  while(!feof($handle)) {
  
      $read = fread($handle, 2096);
  
      echo $read;
  
  }
  
  pclose($handle);

  Problem is when I execute this code, ffmpeg.exe process isn't terminated. And not gonna die when I stop process with using Windows task manager.

  Do you have a solution for this situation ?