Border rendering suddenly not supported by sequencer & odd problem with rendering

Turning off border rendering (render region blender 2.8) in Rendering -> Properties -> Output properties fixed it for me.

I recall playing with menus and the hypothesis is that I checked it somewhere along the way to cause that problem in the first place.

Note: it is a solution with picture for border rendering not supported issue which I encountered and found this QA via google, as for particular issue raised by OP, I think deleting items is the sequencer might help as I understood another answer.

try these settings: from output settings:

1. file format: FFmpeg Video
2. encoding > container: Matroska
3. video > video codec: H.264 : High Quality : Good : 25
4. Audio > Audio Codec: MP3 : 192 : 1.000
5. Post Processing : ckeck Composing : check Sequesncer : Dither = 1.33

after this try rendering animation, it worked for me :)

I did not have my video starting on 0 frame. It was starting later. Moving video back to 0 Fixed it for me.

I ran into the same issue, but then figured it out. By unchecking Render Region under Dimensions, it was solved.

Two problems:

1) You have some sort of image or image sequence already in the sequencer that is causing the render to look bad, because rendering defaults to sequencer when some sort of file is in it.

2) Border rendering is not supported by the sequencer, so it will give you an error message when enabled. Thus proving something is in the sequencer.