Two factory smokestacks. The smoke looks like a big cloud. Sunset natural lighting. Zoom in. Real time. The footage was created from RAW sequence due to additional software for the camera.
Two Factory Smokestacks

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Alpha Channel: No, Looped Video: No, Frame Rate: 25, Resolution: 1280x720, Video Encoding: H.264, File Size: 65.2MB, Number of Clips: 1, Total Clip(s) Length: 0:18