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• OpenCV : FFMPEG : tag 0x00000021/' !???' is not found (format 'mp4 / MP4 (MPEG-4 Part 14)')'

  10 juin 2020, par Hepo8421

  I got error when trying to run a python script. Iam trying to make a project based on pyimagesearch tutorial.

  



  Code :
In first script :

  



  filename = tempVideo.path[tempVideo.path.rfind("/") + 1:]
    s3.upload_file(tempVideo.path, self.conf["s3_bucket"],
        filename, ExtraArgs={"ACL": "public-read",
        "ContentType": "video/mp4"})


  



  In main script :

  



  tempVideo = TempFile(ext=".mp4")
    writer = cv2.VideoWriter(tempVideo.path, 0x21, 30, (W, H),
        True)


  



  Error I recieved :

  



  OpenCV: FFMPEG: tag 0x00000021/'!???' is not found (format 'mp4 / MP4 (MPEG-4 Part 14)')'
Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.7/threading.py", line 865, in run
    self._target(*self._args, **self._kwargs)
  File "/home/pi/Desktop/pi-security-camera/pyimagesearch/notifications/twilionotifier.py", line 27, in _send
    "ContentType": "video/mp4"})
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/boto3/s3/inject.py", line 131, in upload_file
    extra_args=ExtraArgs, callback=Callback)
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/boto3/s3/transfer.py", line 279, in upload_file
    future.result()
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/futures.py", line 106, in result
    return self._coordinator.result()
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/futures.py", line 265, in result
    raise self._exception
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/tasks.py", line 255, in _main
    self._submit(transfer_future=transfer_future, **kwargs)
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/upload.py", line 549, in _submit
    upload_input_manager.provide_transfer_size(transfer_future)
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/upload.py", line 237, in provide_transfer_size
    transfer_future.meta.call_args.fileobj))
  File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/s3transfer/utils.py", line 245, in get_file_size
    return os.path.getsize(filename)
  File "/usr/lib/python3.7/genericpath.py", line 50, in getsize
    return os.stat(filename).st_size
FileNotFoundError: [Errno 2] No such file or directory: './/13675f07-ecec-48ae-97bf-32109eb3ed7d.mp4'


  



  Thanks for advices :)

  


• ffmpeg - offset cropped part of a video

  23 mai 2020, par SomeWindowsUser

  Problem :

  



  

  • I have a video that is made of two separate Videos next to each other

  


  



  -------------------------
|   -------             |
|   |vid2 |             |
|   |     |    vid1     |
|   -------             |
|                       |
|                       |
|                       |
-------------------------


  



  

  • the 2nd video is delayed in respect to the first, that's why I want to offset the second video by the difference

  


  



  For the cropping part, I figured using the crop-option might work, but I don't quite know, how to put the video back together, so that the cropped part of the video ends up at the same place as before, i.e. how to set the position, while overlaying the 2 videos.

  


• avformat/avformat : Remove redundant "NOT PART OF PUBLIC API"

  18 mars 2020, par Andreas Rheinhardt

  avformat/avformat : Remove redundant "NOT PART OF PUBLIC API"
  AVStream.request_probe as well as AVStream.mux_ts_offset are below the
  
  separator of public and private fields, so that a further "NOT PART OF
  
  PUBLIC API" is redundant.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/avformat.h