About libsvtav1

[VideoFan576]

Can libsvtav1 from ffmpeg make lossless avif files, both still and animated images?
My videos are this: H.265 with

Color space : YUV
Chroma subsampling : 4:4:4
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

[Selur]

Looking at the parameters https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Parameters.md and since SVT AV-1 can't encode lossless: No

[sophisticles]

While there may not be a defined lossless setting, you could try setting the gop to 1 so that it is all I frames and set the quantizer parameter to 0.

This should be lossless, or very close to it.

[Selur]

...and set the quantizer parameter to 0

according to the doc, only [1-63] are supported,....

[sophisticles]

...and set the quantizer parameter to 0

according to the doc, only [1-63] are supported,....

Ffmpeg shows 0-63 for both CRF and QP on my system.


[Attachment 78839 - Click to enlarge]

[vongooB9]

libsvtav1 only supports yuv420p and yuv420p10le pixel formats, if the source is yuv444p it will not be lossless even if you use QP or CRF to 0.

[sophisticles]

libsvtav1 only supports yuv420p and yuv420p10le pixel formats, if the source is yuv444p it will not be lossless even if you use QP or CRF to 0.

I completely missed the part where he said they were 4:4:4.

In that case the OP should use libaom-av1 which supports all of these:

yuv420p yuv422p yuv444p gbrp yuv420p10le yuv422p10le yuv444p10le yuv420p12le yuv422p12le yuv444p12le gbrp10le gbrp12le gray gray10le gray12le

He can make a nice 12-bit 4:4:4 AV1.