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Just curious, how can one distinguish original content from a full-res re-encode without access to the actual bits of the original file?
by aftbit 7y ago
Just curious, how can one distinguish original content from a full-res re-encode without access to the actual bits of the original file?
- bavell 7y agoThis may not be exactly what you're asking for but every re-encode introduces additional noise (generational error). Over many re-encodings (even at same high bitrate/quality) the noise will accumulate in a predictable manner. See [0] for an interesting deep-dive blog post on the subject. Now, as for whether or not you can distinguish the re-encoding from it's original source.... difficult but plausible in certain scenarios? Perhaps if the content was heavily re-encoded to the point where you can statistically determine the presence of the generational noise. With only a single re-encode it may be impossible to determine. [0] https://goughlui.com/2016/11/22/video-compression-x264-crf-generational-loss-testing/ https://goughlui.com/2016/11/22/video-compression-x264-crf-g...
- effie 7y agoHash the file you have, then compare to the hash of the official version.