AVIFDEC(1)

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

SEE ALSO
avifenc(1)