Man page - avifdec(1)

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Package: libavif-bin
apt-get install libavif-bin

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libavif-bin

Manual

AVIFDEC

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
REPORTING BUGS
SEE ALSO

NAME

avifdec - decompress an AVIF file to an image file

SYNOPSIS

avifdec [ options ] input.avif output. [ jpg | jpeg | png | y4m ]

avifdec --info input.avif

DESCRIPTION

avifdec decompresses an AVIF file to an image file. Output format can be either JPEG, PNG or YUV4MPEG2 (Y4M).

OPTIONS

-h , --help

Show syntax help.

-V , --version

Show the version number.

-j , --jobs J

Number of jobs (worker threads), or ‘all’ to potentially use as many cores as possible. (Default: all).

-c , --codec C

Codec to use.

Possible values depend on the codecs enabled at build time (see --help or --version for the available codecs). Default is auto-selected from the available codecs.
Possible values are:

	•		aom
	•		dav1d
	•		libgav1

-d , --depth D

Output depth, either 8 or 16. (PNG only; For y4m, depth is retained, and JPEG is always 8bpc).

-q , --quality Q

Output quality in 0..100. (JPEG only, default: 90).

--png-compress L

PNG compression level in 0..9 (PNG only; 0=none, 9=max). Defaults to libpng’s builtin default.

-u , --upsampling U

Chroma upsampling (for 420/422). One of ‘automatic’ (default), ‘fastest’, ‘best’, ‘nearest’, or ‘bilinear’.

-r , --raw-color

Output raw RGB values instead of multiplying by alpha when saving to opaque formats (JPEG only; not applicable to y4m).

--index I

When decoding an image sequence or progressive image, specify which frame index to decode, where the first frame has index 0, or ‘all’ to decode all frames. (Default: 0)

--progressive

Enable progressive AVIF processing. If a progressive image is encountered and --progressive is passed, avifdec will use --index to choose which layer to decode (in progressive order).

--no-strict

Disable strict decoding, which disables strict validation checks and errors.

-i , --info

Decode all frames and display all image information instead of saving to disk.

--icc FILENAME

Provide an ICC profile payload (implies --ignore-icc).

--ignore-icc

If the input file contains an embedded ICC profile, ignore it (no-op if absent).

--size-limit C

Maximum image size (in total pixels) that should be tolerated. (Default: 268435456).

--dimension-limit C

Maximum image dimension (width or height) that should be tolerated. Set to 0 to ignore. (Default: 32768).

Signal the end of options. Everything after this is interpreted as file names.

EXAMPLES

Decompress an AVIF file to a PNG file:

$ avifdec input.avif output.png

REPORTING BUGS

Bugs can be reported on GitHub at:

https://github.com/AOMediaCodec/libavif/issues