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Add GOP layer weights for lowdelay-P

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When using ratecontrol with lowdelay-P, this improves BDRate by 1-25%.
Strongest effect is when using 4 layers and multiple references.

Also allow using 1 or 2 layers with ratecontrol.
This commit is contained in:
Ari Koivula 2016-05-25 14:08:06 +03:00
parent 67acead4bc
commit 3fbd7ed97f
1 changed files with 50 additions and 20 deletions
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70
src/encoder.c
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@ -550,31 +550,61 @@ static int encoder_control_init_gop_layer_weights(encoder_control_t * const enco
switch (num_layers) {
case 0:
case 1:
break;
// Use the first layers of the 4-layer weights.
case 2:
case 3:
case 4:
// These weights were copied from http://doi.org/10.1109/TIP.2014.2336550
if (encoder->target_avg_bpp <= 0.05) {
encoder->gop_layer_weights[0] = 30;
encoder->gop_layer_weights[1] = 8;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.1) {
encoder->gop_layer_weights[0] = 25;
encoder->gop_layer_weights[1] = 7;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.2) {
encoder->gop_layer_weights[0] = 20;
encoder->gop_layer_weights[1] = 6;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
if (encoder->cfg->gop_lowdelay) {
// These weights are based on http://doi.org/10.1109/TIP.2014.2336550
// They are meant for lp-g4d3r4t1 gop, but work ok for others.
if (encoder->target_avg_bpp <= 0.05) {
encoder->gop_layer_weights[0] = 14;
encoder->gop_layer_weights[1] = 3;
encoder->gop_layer_weights[2] = 2;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.1) {
encoder->gop_layer_weights[0] = 12;
encoder->gop_layer_weights[1] = 3;
encoder->gop_layer_weights[2] = 2;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.2) {
encoder->gop_layer_weights[0] = 10;
encoder->gop_layer_weights[1] = 3;
encoder->gop_layer_weights[2] = 2;
encoder->gop_layer_weights[3] = 1;
} else {
encoder->gop_layer_weights[0] = 6;
encoder->gop_layer_weights[1] = 3;
encoder->gop_layer_weights[2] = 2;
encoder->gop_layer_weights[3] = 1;
}
} else {
encoder->gop_layer_weights[0] = 15;
encoder->gop_layer_weights[1] = 5;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
// These weights are from http://doi.org/10.1109/TIP.2014.2336550
if (encoder->target_avg_bpp <= 0.05) {
encoder->gop_layer_weights[0] = 30;
encoder->gop_layer_weights[1] = 8;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.1) {
encoder->gop_layer_weights[0] = 25;
encoder->gop_layer_weights[1] = 7;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
} else if (encoder->target_avg_bpp <= 0.2) {
encoder->gop_layer_weights[0] = 20;
encoder->gop_layer_weights[1] = 6;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
} else {
encoder->gop_layer_weights[0] = 15;
encoder->gop_layer_weights[1] = 5;
encoder->gop_layer_weights[2] = 4;
encoder->gop_layer_weights[3] = 1;
}
}
break;