/g/ - 2nd refined attempt to smuggle AVIF images inside - Technology


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kiker !!m8ZMOnWSI0a
12/30/25(Tue)23:26:04 No.107717483

File: rgb_vp9.webm (838 KB, 512x512)

kiker !!m8ZMOnWSI0a 12/30/25(Tue)23:26:04 No.107717483

2nd refined attempt to smuggle AVIF images inside an AV1 webm. Not sure what else I can improve, ffmpeg doesn't want to retain CICP values, maybe because it expects true video values? Anyway I fixed that now...

I haven't worked out how to script this yet, these are raw windows CLI commands.
avifenc parameters: --sharpyuv -s 4 -d 10 -y 420 --cicp 1/13/1 -a tune=iq -q 70
(echo file '1.avif' & echo file '2.avif' & echo file '3.avif' & echo file '4.avif' & echo file '5.avif') > filelist.txt
ffmpeg -f concat -safe 0 -i filelist.txt -c copy -color_primaries 1 -color_trc 13 -colorspace 1 out.webm
ffmpeg -skip_frame nokey -i out.webm -c copy -color_primaries 1 -color_trc 13 -colorspace 1 -f image2 %0d.avif
AV1 Webm (~90% smaller than webm related RGB lossless VP9 webm)
https://files.catbox.moe/skt1qb.webm

AVIF images extracted from that AV1 Webm
https://files.catbox.moe/3s9g54.zip

Anonymous
12/30/25(Tue)23:27:02 No.107717489

Anonymous 12/30/25(Tue)23:27:02 No.107717489

>>107717483
use case?

Anonymous
12/30/25(Tue)23:31:12 No.107717519

Anonymous 12/30/25(Tue)23:31:12 No.107717519

>>107717489
Showing you my vagina (male)

kiker !!m8ZMOnWSI0a
12/30/25(Tue)23:33:10 No.107717524

kiker !!m8ZMOnWSI0a 12/30/25(Tue)23:33:10 No.107717524

File: nobaru-chan.gif (372 KB, 1920x1080)

372 KB GIF

>>107717489
No clue yet, it's just something you can do right now. Similar to creating static GIFs.

Anonymous
12/30/25(Tue)23:34:05 No.107717530

Anonymous 12/30/25(Tue)23:34:05 No.107717530

>>107717489
posting pedoporn on 4chan because its cool and edgy, to ruin the site and turn it into a glowhole recruitment bonanza

kiker !!m8ZMOnWSI0a
12/30/25(Tue)23:50:47 No.107717604

kiker !!m8ZMOnWSI0a 12/30/25(Tue)23:50:47 No.107717604

File: source_avif.png (152 KB, 512x512)

152 KB PNG

Double checking that this hack worked...

kiker !!m8ZMOnWSI0a
12/30/25(Tue)23:52:58 No.107717618

kiker !!m8ZMOnWSI0a 12/30/25(Tue)23:52:58 No.107717618

Yup, it's lossless. I could not upload that PNG generated from the av1 webm to avif output lol

C:\Users\1337\Pictures\AVIF>ssimulacra2 C:\Users\1337\Pictures\AVIF\av1-webm-to-avif.png C:\Users\1337\Pictures\AVIF\source_avif.png
100.00000000

Anonymous
12/30/25(Tue)23:59:04 No.107717651

Anonymous 12/30/25(Tue)23:59:04 No.107717651

>>107717618
>winjeet
>namefag
>pedo enabler
unholy trinity
kys by the means of repeated defenestration

Anonymous
12/31/25(Wed)00:07:57 No.107717701

Anonymous 12/31/25(Wed)00:07:57 No.107717701

>>107717530
>>107717651
4chan doesn't support AV1 yet. I'm not joking, try it, the upload will fail lol.

Anonymous
12/31/25(Wed)00:11:44 No.107717721

Anonymous 12/31/25(Wed)00:11:44 No.107717721

>>107717701
>this one fails but not all the other formats i already implemented
dont you feel a sudden urge to mix some bleach and ammonia?
i think it would be insanely cool if you did that

kiker !!m8ZMOnWSI0a
12/31/25(Wed)00:23:24 No.107717791

kiker !!m8ZMOnWSI0a 12/31/25(Wed)00:23:24 No.107717791

>>107717721
I could rework this to VP8 Webm/Webp but the compression efficiency wouldn't be as impressive.

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