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A video in MP4 imported in Blender doesn't work. I can see the video in the preview, but when I render it, it is transformed in a single image.

I created a new project, selected the camera, and then drag'n'dropped an MP4 video in the viewport.
I created a new 3D object that rotates in front of the video.

The 3D object renders correctly, but the video doesn't play.
The video plays correctly only in preview mode.

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  • $\begingroup$ Can you add details to your question? Like how did you import the mp4, as a plane or a sequence in the VSE or in the compositor or what? $\endgroup$
    – pevinkinel
    Commented Aug 24, 2020 at 0:11
  • $\begingroup$ @wilks I update question $\endgroup$
    – Andrea Tosato
    Commented Aug 24, 2020 at 3:46
  • $\begingroup$ After editing the question to make it more readable, I believe the issue is actually that the user used a background video, which isn't renderable. See blender.stackexchange.com/a/38464/53447 So I must close this question as duplicate, Though I doubt the author would come back 4 years later to check if it is indeed the right answer or ask for reopening x) $\endgroup$
    – Lauloque ♦
    Commented Aug 31 at 0:03

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I'm guessing your output information is set to an image output. You need to change it to a video output in the properties panel (see image below). Then hit Render > Render Animation.

RenderAnimation

You also may need to change some audio settings, which I would need to research to remember how.

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