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• 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"]



  


• Errors when transcoding H264 into FLV container using libav

  12 mars 2019, par Jacko

  I have a program that encodes video and audio using H264 and AAC.
  I am adding a layer that feeds the encoded packets to libav in FLV
  container, and then sends to fflplay as receiver.

  Audio is working, but video triggers these warnings ;

  [NULL @ 0x7f460c01e380] missing picture in access unit with size 1673
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 0, skipping.
  
  [h264 @ 0x7f460c01e380] no frame!
  
  [h264 @ 0x7f460c01e380] missing picture in access unit with size 3286
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 22, skipping.
  
  [h264 @ 0x7f460c01e380] No start code is found.
  
  [h264 @ 0x7f460c01e380] Error splitting the input into NAL units.
  
  [h264 @ 0x7f460c01e380] sps_id 24 out of range0KB sq=    0B f=0/0   
  
  [h264 @ 0x7f460c01e380] missing picture in access unit with size 3369
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 22, skipping.
  
  [h264 @ 0x7f460c01e380] No start code is found.
  
  [h264 @ 0x7f460c01e380] Error splitting the input into NAL units.
  
  [h264 @ 0x7f460c01e380] missing picture in access unit with size 3196
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 22, skipping.
  
  [h264 @ 0x7f460c01e380] No start code is found.
  
  [h264 @ 0x7f460c01e380] Error splitting the input into NAL units.
  
  [h264 @ 0x7f460c01e380] missing picture in access unit with size 3084
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 22, skipping.
  
  [h264 @ 0x7f460c01e380] No start code is found.
  
  [h264 @ 0x7f460c01e380] Error splitting the input into NAL units.
  
  [h264 @ 0x7f460c01e380] missing picture in access unit with size 3491
  
  [h264 @ 0x7f460c01e380] Invalid NAL unit 22, skipping.
  
  [h264 @ 0x7f460c01e380] no frame!

  Not sure how to troubleshoot this - hoping it is just a setting mismatch between libx264 and libav.

• tests/fate/matroska : Add container cropping test

  16 mai, par Andreas Rheinhardt

  tests/fate/matroska : Add container cropping test
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] tests/fate/matroska.mak
  • [DH] tests/ref/fate/matroska-crop