I load a video file with:

source = pyglet.media.load(sys.argv[1])
format = source.video_format

and look at the format.

source.duration gives me the playing time in seconds.
format give me some other useful info, but I can't find the frame
rate.

My app would like to know at the start the number of frames it will
get via looping
nextframe = source.get_next_video_frame() ,
because I need to create a (still) image in which one dimension is
related to the number of video frames.

Currently I have to hard-wire frames-per-second into the program, or
ask the user to specify that.
I could do a first pass to determine this, but that's un-aesthetic.
Or make the image too large and crop off the unused part at the end.

Is there a way to get frames-per-second or number-of-frames directly
from the source?

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