Is it possible to write infinite looping videos?

[t-io]

I'm wondering if something like this is possible somehow. To have a video which loops infinite without specifying a duration or number of loops.
The loop() Function is decorated with @requires_duration but the duration and number of loops also can be empty. So I assume it's technically not possible to force something like an .mp4 to auto-loop.
I tried this:

url = 'http://www.gifbin.com/bin/1236242020_JessicaBielTheTexasChainsaw.gif'
clip = mp.VideoFileClip(url)
cc = clip.fx(vfx.loop)
cc.write_videofile("gif_video.mp4")

but always end up in a ValueError("Attribute 'duration' not set")
Do you know a clever way to loop a .mp4 without bloating the filesize?
By the way thanks for the cool library :)

[Red5d]

I don't think the mp4 format allows for looping the video. The software playing the video would have to do that.

[t-io]

yes, I figured this out by myself. Thanks for your reply. I close this one.