__pos <= size()FRAMEY4M misses the frame header. Y4M has invalid frame size. Error: AV1HEVChq:Lo:vPp:t:b:AEe:No encoder available. .avif.heicpngy4mCould not crop image: helpqualityoutputlosslessthumbverboseparamsno-alphano-thumb-alphalist-encodersencoderbit-deptheven-sizematrix_coefficientscolour_primariestransfer_characteristicfull_range_flagenable-two-colr-boxespremultiplied-alpha---------------------------------------- Usage: heif-enc [options] image.jpeg ... When specifying multiple source images, they will all be saved into the same HEIF/AVIF file. When using the x265 encoder, you may pass it any of its parameters by prefixing the parameter name with 'x265:'. Hence, to set the 'ctu' parameter, you will have to set 'x265:ctu' in libheif (e.g.: -p x265:ctu=64). Note that there is no checking for valid parameters when using the prefix. -h, --help show help -q, --quality set output quality (0-100) for lossy compression -L, --lossless generate lossless output (-q has no effect) -t, --thumb # generate thumbnail with maximum size # (default: off) --no-alpha do not save alpha channel --no-thumb-alpha do not save alpha channel in thumbnail image -o, --output output filename (optional) -v, --verbose enable logging output (more -v will increase logging level) -P, --params show all encoder parameters -b, --bit-depth # bit-depth of generated HEIF/AVIF file when using 16-bit PNG input (default: 10 bit) -p set encoder parameter (NAME=VALUE) -A, --avif encode as AVIF --list-encoders list all available encoders for the selected output format -e, --encoder ID select encoder to use (the IDs can be listed with --list-encoders) -E, --even-size [deprecated] crop images to even width and height (odd sizes are not decoded correctly by some software) --matrix_coefficients nclx profile: color conversion matrix coefficients, default=6 (see h.273) --colour_primaries nclx profile: color primaries (see h.273) --transfer_characteristic nclx profile: transfer characteristics (see h.273) --full_range_flag nclx profile: full range flag, default: 1 --enable-two-colr-boxes will write both an ICC and an nclx color profile if both a present --premultiplied-alpha input image has premultiplied alpha Note: to get lossless encoding, you need this set of options: -L switch encoder to lossless mode -p chroma=444 switch off color subsampling --matrix_coefficients=0 encode in RGB color-space Header format error in Y4M file. /usr/include/c++/8/bits/basic_string.h%s:%d: %s: Assertion '%s' failed. Encoder parameter must be in the format 'name=value' Invalid quality factor. Must be between 0 and 100. Could not create context object Unknown encoder ID. Choose one from the list below. Warning: option --even-size/-E is deprecated as it is not needed anymore. Image only has a size of 1 pixel width or height. Cannot crop to even size. 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