[Python] How do I get duration of an In Memory Video in Python / Django?

So I was successfully using the following code to get the duration of a saved video in Django.

def get_video_length(file_path):
command = [
'ffprobe',
'-v',
'error',
'-show_entries',
'format=duration',
'-of',
'default=noprint_wrappers=1:nokey=1',
file_path
]

try:
output = check_output( command, stderr=STDOUT ).decode()
except CalledProcessError as e:
output = e.output.decode()

return output


But now I need to get the duration of an uploaded file before saving it. I have a serializer with a FileField and on validate method I should check the video duration. For instance:

class VideoSerializer(serializers.Serializer):
video = serializers.FileField(required=True, validators=[validate_media_extension, validate_video_duration])


Then on validate_video_duration I needed to call some method like get_video_length, but I need an alternative to get the duration from the video in memory. The object that I have is an instance of InMemoryUploadedFile (https://docs.djangoproject.com/en/2.2/_modules/django/core/files/uploadedfile/)

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