Adds command line option --fast-residual-cost=<limit>. When QP is below
the limit, estimates the cost of coding the residual coefficients from
the sum of absolute coefficients. Skipping CABAC is not worth it with
high QPs because there are fewer coefficients so CABAC is not as slow.
All intra coding is a special case so it can be permitted even though
Kvazaar normally only supports intra periods that are divisible by the
GOP length.
Changes kvz_config_validate to output an error if the given QP is out of
range and changes kvz_set_picture_lambda_and_qp to clip the QP to the
valid range if is too large after applying QP offset from GOP structure.
Adds option --erp-aqp for enabling adaptive QP for 360 degree video with
equirectangular projection. When projected into a spherical surface,
the middle part of the video covers relatively larger area than the top
and bottom parts. Enabling --erp-aqp sets up a ROI delta QP array which
uses higher QPs for the top and bottom of the video and lower QPs for
the middle part.
Limits video size so that the number of luma and chroma pixels can be
stored in an int. Fixes some integer overflows that resulted in
segmentation faults.
cfg.c:1024:74: warning: format specifies type 'size_t' (aka 'unsigned
long') but the argument has type 'unsigned long long'
[-Wformat]
fprintf(stderr, "Too large ROI size: %llu (maximum %zu).\n", size, SIZE_MAX);
This encapsulates tiles or WPP rows into their own slices, making
it possible to send them as soon as they are done, instead of waiting
for the other substreams to finish and coding the substream offsets
in the slice header.
- Checks the return value of fopen when opening the ROI file. Fixes
a segfault when the file cannot be opened.
- Check that the width and height are positive. Fixes reading past the
end of the delta QP array in kvz_set_lcu_lambda_and_qp.
- Check for overflow in width * height. Fixes an overflow resulting in
a segfault.
- Properly check that fscanf succeeds. Fixes silently accepting ROI
files that are too short.
- Properly close the FILE pointer.
When --threads=auto was given on the command line, cfg->threads was
actually set to zero, disabling threads altogether. Fixed to set
cfg->threads to -1, so that the number of threads is chosen
automatically.
The rd-complexity of slow presets is better with a less agressive GOP.
Adding the GOP as part of the preset improved BDRate enough, that it
didn't make sense anymore to have a veryslow target the best BDRate.
Instead, push that responsibility to placebo by making it a little bit
faster.
