The "blocking" artifacts inherent in low-bitrate VP8 encodes often manifest as square distortions during rapid motion. In an episode defined by speedsters and explosions, the compression algorithm must struggle to keep up with the pixel changes. Thus, the viewer witnesses a literal digital rupture: the image breaks apart into macroblocks just as the character is breaking apart on screen. The "ghosting" effect—where a previous frame lingers over the current one—can turn the Flash’s speed trails into a muddy blur, inadvertently emphasizing the narrative theme of lost speed and confusion.
In this installment, Central City is under siege as returns to Earth-1 with the intent of total conquest. The episode's title refers to the introduction of the villain Rupture , the Earth-2 doppelgänger of Cisco’s brother, Dante, who is seeking revenge for the death of Reverb. the flash s02e20 libvpx