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how far can i push the chroma subquantisation?

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minjaesong
2025-09-22 10:37:33 +09:00
parent be43384968
commit 4851f61c56
2 changed files with 9 additions and 6 deletions
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10
video_encoder/encoder_tav.c
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@@ -151,6 +151,8 @@ static const int QUALITY_CG[] = {240, 180, 120, 60, 30, 5};
// psychovisual tuning parameters
static const float ANISOTROPY_MULT[] = {1.8f, 1.6f, 1.4f, 1.2f, 1.0f, 1.0f};
static const float ANISOTROPY_BIAS[] = {0.2f, 0.1f, 0.0f, 0.0f, 0.0f, 0.0f};
static const float ANISOTROPY_MULT_CHROMA[] = {2.4f, 2.2f, 2.0f, 1.7f, 1.4f, 1.0f};
static const float ANISOTROPY_BIAS_CHROMA[] = {0.4f, 0.3f, 0.2f, 0.1f, 0.0f, 0.0f};
// DWT coefficient structure for each subband
@@ -350,7 +352,7 @@ static void show_usage(const char *program_name) {
printf(" -v, --verbose Verbose output\n");
printf(" -t, --test Test mode: generate solid colour frames\n");
printf(" --lossless Lossless mode: use 5/3 reversible wavelet\n");
printf(" --no-delta Disable delta encoding (less noisy picture at the cost of larger file)\n");
printf(" --intra-only Disable delta encoding (less noisy picture at the cost of larger file)\n");
printf(" --ictcp Use ICtCp colour space instead of YCoCg-R (use when source is in BT.2100)\n");
printf(" --no-perceptual-tuning Disable perceptual quantisation\n");
printf(" --encode-limit N Encode only first N frames (useful for testing/analysis)\n");
@@ -938,9 +940,9 @@ static float get_perceptual_weight(tav_encoder_t *enc, int level, int subband_ty
} else if (subband_type == 1) { // LH chroma - horizontal chroma details
return FCLAMP(base, 1.0f, 100.0f);
} else if (subband_type == 2) { // HL chroma - vertical chroma details (even less critical)
return FCLAMP(base * ANISOTROPY_MULT[enc->quality_level], 1.0f, 100.0f);
return FCLAMP(base * ANISOTROPY_MULT_CHROMA[enc->quality_level], 1.0f, 100.0f);
} else { // HH chroma - diagonal chroma details (most aggressive)
return FCLAMP(base * ANISOTROPY_MULT[enc->quality_level] + ANISOTROPY_BIAS_CHROMA[enc->quality_level], 1.0f, 100.0f);
return FCLAMP(base * ANISOTROPY_MULT_CHROMA[enc->quality_level] + ANISOTROPY_BIAS_CHROMA[enc->quality_level], 1.0f, 100.0f);
}
}
}
@@ -2552,7 +2554,7 @@ int main(int argc, char *argv[]) {
{"verbose", no_argument, 0, 'v'},
{"test", no_argument, 0, 't'},
{"lossless", no_argument, 0, 1000},
{"no-delta", no_argument, 0, 1006},
{"intra-only", no_argument, 0, 1006},
{"ictcp", no_argument, 0, 1005},
{"no-perceptual-tuning", no_argument, 0, 1007},
{"encode-limit", required_argument, 0, 1008},