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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 :)

  


• Chroma Key replace green color part with another image using FFMPEG

  15 septembre 2021, par Welborn Machado

  Chroma Key Image

  



  I want to replace green color of the above chromekey image with another image. The image should only replace with the green color not overlay entire image.

  



  I am using following sample command below but it overlay the entire image not only the green color.

  



  -y -i /storage/emulated/0/dummyResized.jpg -i /storage/emulated/0/circularImage.png -filter_complex [1:v]colorkey=green:0.3:0.2[ckout] ;[0:v][ckout]overlay[out] -map [out] /storage/emulated/0/outputBlackCircular.jpg

  


• How I Can Run Some Part of the Code on another EC2 instance

  4 mai 2021, par Not A Bot — ffmpeg

  I have a NodeJS application running on an EC2 instance, which has some feature where users can record multiple videos.

  


  When the user logs out I am using ffmpeg(version 4.2.4) to combine all those videos into single a video.

  


  I am recording the video in WEBM format, and the final single video should be in MP4 format.

  


  Suppose the user has recorded 3 videos of 10 minutes each, then in last when the user logs out, all these 3 videos should be combined into the single video on length of 30 minutes.

  


  Now everything is working fine, but the CPU usage is high when all the conversation and concatenation are going around.

  


  CPU usage is sometimes as high as 60-70%

  


  The process I am following is

  


  


  1. Convert the webm file to the mp4 file.

     


     ffmpeg -i input_file.webm -c:v copy -c:a copy output_file.mp4


     


  


  2. Convert MP4 to ts(Transport Stream) file.

     


      ffmpeg -i output_file.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts OUTPUT_MP4.ts


     


     I am following this process to concatenate all the mp4 files into one.

     


  


  3. Concatenate files

     


     ffmpeg -i "concat:OUTPUT_MP4_1.ts|OUTPUT_MP4_2.ts|OUTPUT_MP4_3.ts" -c copy -bsf:a aac_adtstoasc FINAL_MP4_SINGLE_FILE.mp4


     


  


  


  All this process is time-consuming(but not a priority), however, this process is taking CPU usage a lot.

  


  The server can crash or become slow if there are many users on my application and may video conversion is going on.

  


  Now, my question is how I can run this conversion process on the dedicated EC2 instance where only conversions can happen and not any other work, from the same code that is running on the first EC2 instance.