I want to compress the video from project directory using ffmpeg in python
the video is saved from cv2.VideoCapture(rtsp_url)
Normally it run without problem in my local machine, but when I dockerize my app it seems docker container can’t recognize ffmpeg or I missed something.
def compress(name): with open(name) as f: output = name[0:-4] + "-f"+ ".mp4" input = name subprocess.run('ffmpeg -i ' + input + ' -vcodec libx264 ' + output) video = cv2.VideoCapture(rtsp_url) # This is where the video comming from fileName = saveToProjDir(video) # Save the video to project directory and return the name compress(fileName) # Compress the video
It throws exception
Exception in thread Thread-8 (compress): Traceback (most recent call last): File "/usr/local/lib/python3.11/threading.py", line 1038, in _bootstrap_inner self.run() File "/usr/local/lib/python3.11/threading.py", line 975, in run self._target(*self._args, **self._kwargs) File "/app/main.py", line 59, in compress subprocess.run('ffmpeg -i ' + input + ' -vcodec libx264 ' + output) File "/usr/local/lib/python3.11/subprocess.py", line 546, in run with Popen(*popenargs, **kwargs) as process: ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.11/subprocess.py", line 1022, in __init__ self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/local/lib/python3.11/subprocess.py", line 1899, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg -i cam1_2022-11-15125845.avi -vcodec libx264 cam1_2022-11-15125845-f.mp4'
This is how I docker my python app.
FROM python:3.11.0 WORKDIR /app/ ENV VIRTUAL_ENV = /env RUN python3 -m venv $VIRTUAL_ENV ENV PATH="$VIRTUAL_ENV/bin:$PATH" COPY requirements.txt . RUN pip install -r requirements.txt RUN apt-get -y update RUN apt-get install ffmpeg libsm6 libxext6 -y ADD main.py . CMD ["python","/app/main.py"]
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Answer
To debug your problem my suggestion is to use your container interactively.
Try running a new container like this:
docker run -t -i <image-name-or-container-id> /bin/bash
Or attach to your running container:
docker exec -i -t <container-id> /bin/bash
In this way you can play around, try to launch ffmpeg from different paths, install other dependencies and finally see what you are missing.