NAME

avifdec - decompress an AVIF file to an image file

SYNOPSIS

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

avifdec --info input.avif

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

-h, --help: Show syntax help.
-V, --version: Show the version number.
-j, --jobs J: Number of jobs (worker threads). 1 or less means single-threaded. Default is 1. Use all to use all available cores.
-c, --codec C: AV1 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.

-d, --depth D: Output PNG depth. Ignored when the output format is JPEG (always 8 bits per channel) or Y4M (input depth is retained).

-q, --quality Q: Output JPEG quality in the range 0-100. Default is 90. Ignored if the output format is not JPEG.
--png-compress L: Output PNG compression level in the range 0-9 (fastest to maximum compression). Default is libpng’s built-in default. Ignored if the output format is not PNG.
-u, --upsampling U: Chroma upsampling method. Ignored unless the input format is 4:2:0 or 4:2:2.

-r, --raw-color: Output raw RGB values instead of multiplying by alpha when saving to opaque formats. This is available if the output format is JPEG, and not applicable to y4m.
--index I: When decoding an image sequence or progressive image, specify which frame index to decode. Default is 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.
--ignore-icc: If the input file contains an embedded ICC profile, ignore it (no-op if absent).
--size-limit C: Specifies the image size limit (in total pixels) that should be tolerated. Default is 268,435,456 pixels (16,384 by 16,384 pixels for a square image).
--dimension-limit C: Specifies the image dimension limit (width or height) that should be tolerated. Default is 32,768. Set it to 0 to ignore the limit.
--: Signals the end of options. Everything after this is interpreted as file names.