In file-sharing contexts, x264 refers to a (H.264/MPEG-4 AVC). It’s a common, high-quality compression method that balances file size and visual fidelity.
If you download from iTunes/Amazon/Google Play, the episode will be in a format like x264 or H.264 as well. So the x264 tag isn’t a sign of piracy by itself – it’s just a technical label. power book ii: ghost s02e10 x264