The only way is to use forensic tools and perform a side-by-side comparison. You will need to have an original and a supposedly re-encoded version. Once encoded and altered, the 'new' video can be re-encoded to another codec, assuming new properties. I Hope it helps, seek for forensic video tools.
Sorry if my answer wasn't up to your standards, it's just that your question itself is very confusing. What do you mean by "some other x264"? Could you perhaps word it a little better? People here also have no idea what this "AI" you're mentioning has said.
EDIT: Did you perhaps mean something along the lines of: "How to tell if a remake/re-encode has been re-encoded to AV1 or some other codec?" I'm really trying to understand what you're asking. Maybe an example would help...
Comment in Feedback 27/12/2025 02:02 — Anonymous: "MediaQuestion"
Thanks, but AI already mention mediainfo and about the tag from nyaa will not apply to downloaded shows. About your statement "The codec (HEVC/H.265/x265, AVC/H.264/x264, AV1 etc) don't really matter...", is not true, it matters for some of us and that is the point of the question.
Please, if someone else has a more academic answer, feel free to comment, thanks.
The "Remake" tag on nyaa (which looks like this here) is the first indicator that a release was re-encoded more than once. However it's not always respected, so the description is just as valuable to tell if it's a re-encode. And you can check the mediainfo for any clues of leftover metadata giving out which release was used as a source, like the track names. The codec (HEVC/H.265/x265, AVC/H.264/x264, AV1 etc) don't really matter since you can freely encode from one to the other.
Comment in Feedback 26/12/2025 21:31 — Anonymous: "MediaQuestion"
How to tell if a video HEVC was re-encoded to AV1 or some other x264? Please don't paste respose from AI, i would like to know from personal info or technique. Thanks
Comment in Feedback 23/12/2025 01:33 — Anonymous: "Tenken kapitánya"
Comment in Feedback 21/12/2025 23:55 — Anonymous: "Tenken kapitánya"
Hello, What was the "girl finds magic sword" anime, more recent than Tenken but with an excessively complicated world-building, that was essentially impossible to follow due to non-linear storytelling? It was based on a famous, older LN which many considered unanimable and was indeed ill-received. TiA!
Comment in Feedback 18/12/2025 17:30 — Anonymous: "thankful_guy"
If that's not clueless I don't know what is? it's not wrong if someone calls them "yapping".
How would you feel if I told you that you are clueless and are just yapping? Would you feel the need to respond, rejecting the claim and possibly censure the claimant? If so, you have your explanation for the response.
The op said "stfu" when they're clearly don't know what they're talking about. If that's not clueless I don't know what is? it's not wrong if someone calls them "yapping". it's because that's exactly what they're doing.
Comment in Feedback 14/12/2025 07:25 — Anonymous: "Anomymous"
The comment responded to included "Lmao" and "yapping", whilst insinuating the poster is clueless and not worth paying attention to. Both sides are provoking each other and escalating the situation. And thus I wouldn't single out any particular comment down the chain as definitively "ragebait".
Stopping this squabble just requires stopping one party, and I don't really care which. If you find that unfair, then don't engage or escalate, and you won't be targeted.
No, I replied to the comment I intended to reply to. I don't see Akira's comment as "trolling" in the context above. If you disagree, feel free to explain your reasoning.
I think you're assuming way too much. I have a degree of tolerance, but may step in if I think things need to be reined in. You might see it as 'ignoring', which I'd agree to some extent - I have more interesting things to attend to than to pay attention to every petty squabble going on. There's no "special treatment" going on, call it "random treatment" if you prefer. If you despise that, unfortunately I can't help you there.
Because you allow them? You know who's the guy behind that comment and you just ignore their behavior. That's called special treatment which is something I despise.
You replied to the wrong comment then. The troll you're looking for goes by name "Akira" and you don't even moderate their comment while it's clear that they're being disruptive. How cute.
Thanks for the question. I've been looking for an Anidex alternative for a while, so it's good to see this as potentially it. At this stage, I'm interested in mirroring from them.
27/12/2025 05:16 — Anonymous: "MediaQuestion"