I think I may have figured out how to fraudently pass off AVIF images as video inside a WEBM container.ffmpeg -i 1.avif -c:v copy 1.webm & ffmpeg -i 2.avif -c:v copy 2.webmffmpeg -i 3.avif -c:v copy 3.webm & ffmpeg -i 4.avif -c:v copy 4.webm & ffmpeg -i 5.avif -c:v copy 5.webm(echo file '1.webm' & echo file '2.webm' & echo file '3.webm' & echo file '4.webm' & echo file '5.webm') > filelist.txtffmpeg -f concat -safe 0 -i filelist.txt -c copy 12345.webm5 pack of AVIF images (125 KB): https://files.catbox.moe/ei4qf6.zipthose 5 AVIF images converted to a fraudulent (but playable) WEBM (124 KB): https://files.catbox.moe/5r19yu.webmThere's 1 problem though, I have no idea how to reverse this process.
>>107669807Use case for fraudently passing off AVIF images as video inside a WEBM container?
this isn't a fraud or exploit or hack you dipshit it's a design consequence of avif as a filetype that the stream is bitexact identical to an av1 keyframe containing the same rgb data.>I have no idea how to reverse this process.ffmpeg -i 12345.webm -c copy %d.avif
>>107669839Amusingly when I try this it fails and gives me a single 124 KB animated AVIF literally named %d.avif but what I really want are my 5 separate AVIF images intact. FUCK, there has to be a way man...https://files.catbox.moe/xiimgv.avif
>>107669839And who are you, nigga, the authority on .avif file format?
>>107669850My bad %0d. It's been a long time since I've used ffmpeg, either I forgot or the API changed.
>>107669901No dice, now it's a single animated AVIF named %0d.avifThere's something wrong here, ffmpeg is holding my 5 AVIF children hostage...
Your autism made an invalid video file. Try exporting PNG images named 1.png 2.png 3.png to an AV1 webm first. Something likeffmpeg -framerate 1 %d.png -c:v libsvtav1 -crf 30 -g 1 -pix_fmt yuv420p autism.webmAnd thenffmpeg -i autism.webm -c copy %d.avif
>>107669839>the stream is bitexact identical to an av1 keyframeHoly shit, that was the clue. You're a god damned genius. I figured out the other part, apparently image2 expects PNG/JPG, a proper image format but if you switch it on before the output it'll export AV1 video data anyway lol.ffmpeg -skip_frame nokey -i in.webm -c copy -f image2 %d.avifhttps://files.catbox.moe/77pw8j.zip
Bad news, the colors don't match and CICP has now changed. However the good news is SSIM = 1 so the raw YUV data is in fact lossless here.ffmpeg ignored CICP...
>>107669807Some guy ong /g/ used to post optimized jpgs/pngs as "webps" that were 1 frame webms.
>>107669807Aren't they just separate streams with start time metadata if it's concat? Also why would you do this it's guaranteed to be broken maybe everywhere, just because your bloated everything exe called a browser can do it does not mean a site will accept it
>>107670414huh, what a horrible way to support WebPs. On the other hand, VP9 WebPs? yay I gues
