It seems 4chan started to alter the webms that are uploaded here. It happened during the last month, meaning the webm that was downloaded a month ago after upload now will have a different hash checksum. I'm going to test it posting some webms I downloaded from from 4chan more than a month ago.Starting with this webm from /v/.https://arch.b4k.dev/v/search/image/HiI3cP_nzmP_VtJTyg1kNw/
>>108667649and this webmhttps://arch.b4k.dev/v/search/image/4SF7KD2W1JofzILZgcb4TA/
>>108667649https://desuarchive.org/g/search/image/xVrSJmikwtbeS5icW0rszA/>>108667655https://desuarchive.org/g/search/image/tu6DvGAIzydOxsL51CLOkw/Both webms were altered. This change might cause problems with archives and your collection of webms, because of multiple identical webms having different hash.
>>108667679I don't know how the webms are being modified. I don't think there was any metadata left to be removed, because I think 4chan already removed all metadata.The file size of the modified webm is few bytes smaller.
Now checking MP4 files.https://arch.b4k.dev/_/search/image/oMjJ3eLUCACVXz-weQ3AFg/
>>108667730It seems the MP4 file was NOT ALTERED.I'm going to check the VP9 webms, because the webms I posted were both vp8.
Now the VP9 webm:https://arch.b4k.dev/_/search/image/HGLGlyncNpDJXkrU_hjaGw/
>>108667764VP9 webm was altered too, it seems only the WEBM videos get modified.https://desuarchive.org/g/search/image/1j2V4K0riNyTfrIcBydiuw/
what does this mean though
>>108667816The search by image feature in 4chan archives is basically broken for webms, because if someone reposts an older webm it have a different hash.
>>108667649did you do a file diff? see exactly what bytes were changed, and if all the new files have a pattern
