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See here the first rendered image (Cycles engine). You can notice that the background does not look very pixelated at all. This quality is fine:

enter image description here

However, in my renders (same Cycles engine, same render ... just some frames later), in subsequent frames, the background (and everything else) suddenly becomes very pixelated:

enter image description here

I hope this question can be answered. I have not found any other answers on this website, because this question does not relate to fireflies, and the render dimensions stay the change.

@Yohello1's comment -> Here are my output properties:

enter image description here

I render the video via my Mac's terminal:

enter image description here

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    $\begingroup$ Are you putting it directly to a video format or putting onto individual frames? $\endgroup$
    – Yohello 1
    Feb 1 '20 at 20:02
  • $\begingroup$ @Yohello1 I have now updated the OP to answer your question. Please help. $\endgroup$
    – O0123
    Feb 2 '20 at 8:36
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    $\begingroup$ It looks like video compression artifact. That's almost impossible to avoid with the codec you use (divx). You can try a more efficient codec like H264. $\endgroup$
    – thibsert
    Feb 2 '20 at 8:51
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As @thibsert implied, it seems to be the video-codec which creates the problems. If you change it to e.g. H.264 the problem is solved.

enter image description here

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  • $\begingroup$ Too add to this I would recommend using a MP4 container instead $\endgroup$
    – Yohello 1
    Feb 2 '20 at 20:05
  • $\begingroup$ @Yohello1, Why? $\endgroup$
    – O0123
    Feb 3 '20 at 21:04
  • $\begingroup$ Just because it's more supported (from why I know ) $\endgroup$
    – Yohello 1
    Feb 4 '20 at 15:54

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