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• FFMPEG reads fps of input h264 file wrong, resulting in wrong duration of output file

  20 janvier 2015, par JolJols

  I am trying to convert an .h264 file created with python from an incoming stream to xvid format with ffmpeg.

  The file is 30min long and 12fps. However, the converted file automatically creates a file that is 25fps and thus 14.4min long. If I set fps like ffmpeg -i test.h264 -r 12 test.avi it creates a video of 14.4min long with a fps of 12.

  How can I set it to see the incoming video as 12fps ? I tried recording immediately in xvid coded in python using FOURCC but on mac OS X the only codec that seems to work is mp4v. I also tried using MP4Box, which creates the right video duration and fps but for which I cannot set it to the xvid coded (which I need).

• How to concat the mp3 file and webm file into a new webm file ?

  12 août 2015, par it_is_a_literature

  There is a webm file that contains no audio. I want to merge an audio file with this video. I’ve tried the following command :

  ffmpeg -i /home/test.mp3  -i /home/output.webm -vcodec copy -acodec copy /home/newtest.webm

  And received the error :

  Could not write header for output file #0 (incorrect codec parameters ?):         Invalid argument.

• How to setup ffmpeg in docker container

  15 novembre 2022, par TorR

  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"]