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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 :)

  


• All audios should be played after combing using ffmpeg. But there is only audio for the first part

  6 mai 2020, par Eric Z

  This code is combining 3 mp4 files using ffmpeg command. Each file has audio. 
After combining, I can listen audio for only first part. 
How can I solve this problem ?

  



  ===========================================================================

  



  ffmpeg -y -i "tmp/titled-0c33a83dc70534c67f66.mp4" -i "tmp/titled-1c2fc9a95e644ab135a3.mp4" -i "tmp/titled-73c3fb1a3ea435cacdd2.mp4" -i "logo/logo.png"  -filter_complex "
nullsrc=s=1280x720[bg];
[0:v]setpts=PTS-STARTPTS+0/TB[v0];
[1:v]setpts=PTS-STARTPTS+4.039/TB[v1];
[2:v]setpts=PTS-STARTPTS+8.078/TB[v2];
[bg][v0]overlay=x='if(lte(t,4.039),0,min(0,-w*min(1,max(0,0.98*(t-4.039)^2))))':y=0,trim=duration=13.145[bg];
[bg][v1]overlay=x='if(gte(t,8.078),-w*min(1,max(0,0.98*(t-8.078)^2)),max(0,1280*(1-min(1,max(0,0.69*(atan(8*(t-4.039)^2.7)))))))':y=0[bg];
[bg][v2]overlay=x='max(0,1280*(1-min(1,max(0,0.69*(atan(8*(t-8.078)^2.7))))))':y=0"
-y -vcodec h264 -crf 13 -acodec aac -strict -2 "out.mp4"


  


• Problem with streamcopy of a part of av1 video in ffmpeg

  22 avril 2020, par vorrom

  I'm trying to cut part of a video from av1-mp4 file with FFMmpeg command and I want do it withuout recompressing. But there is no result.
I try method with -ss -t or -to parameters with different combinations.

  



  ffmpeg -ss 10 -i D:\in_av1.mp4 -t 5 -vcodec copy -acodec copy D:\out_av1.mp4


  



  -ss from input file get me 15 seconds video from beginning instead 5 seconds from 10

  



  ffmpeg -i D:\in_av1.mp4 -ss 10 -t 5 -vcodec copy -acodec copy D:\out_av1.mp4


  



  this way get 5 seconds audio file without video data.
It seems to me that coder can not find start point for operation.

  



  I make an av1.mp4 example file, you can find it here. https://pixeldrain.com/u/c8fbQgYK I understand that AV1 is new format and have experimental flag while converting with it. But nevertheless FFmpeg carrectly change result when I change -t parameter. If I use

  



  ffmpeg -ss 10 -i D:\in_av1.mp4 -t 7 -vcodec copy -acodec copy D:\out_av1.mp4


  



  it give me 17 seconds. So -t part working. Whats why I hope there is way to solve my problem.

  



  I use ffmpeg-20200417-889ad93-win64-static for Windows.