Update op_playback.py

[b4zz4]

Problem with frames float

[chsh2]

May I ask the purpose of this commit? I think max(1, round( ... )) is already an integer. Have you found any failure cases?
Also, I do not really understand your syntax here.

[b4zz4]

Looks like it doesn't generate an entire number. Because by extending the timeline a lot appear missing frames, perhaps instead of round (max , should have put int(max

I could not debug the value of the variable, but the message appears: "GPUTexture: Blender Texture Not Loaded!" and for an instant the frame is seen as missing.