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Support and document lavc b_sensitivity option. 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@18573 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
corey 2006-06-05 06:37:29 +00:00
parent 52d2a448f8
commit 5414825bac
2 changed files with 15 additions and 0 deletions
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12
DOCS/man/en/mplayer.1
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@ -7005,6 +7005,7 @@ strategy to choose between I/P/B-frames:
Always use the maximum number of B-frames (default).
.IPs 1
Avoid B-frames in high motion scenes.
See the b_sensitivity option to tune this strategy.
.IPs 2
Places B-frames more or less optimally to yield maximum quality (slower).
You may want to reduce the speed impact of this option by tuning the
@ -7013,6 +7014,17 @@ option brd_scale.
.PD 1
.
.TP
.B b_sensitivity=<any integer greater than 0>
Adjusts how sensitively vb_strategy=1 detects motion and avoids using
B-frames (default: 40).
Lower sensitivities will result in more B-frames.
Using more B-frames usually improves PSNR, but too many B-frames can
hurt quality in high-motion scenes.
Unless there is an extremely high amount of motion, b_sensitivity can
safely be lowered below the default; 10 is a reasonable value in most
cases.
.
.TP
.B brd_scale=<0\-10>
Downscales frames for dynamic B-frame decision (default: 0).
Each time brd_scale is increased by one, the frame dimensions are

3
libmpcodecs/ve_lavc.c
View File

@ -162,6 +162,7 @@ static int lavc_param_sc_factor = 1;
static int lavc_param_video_global_header= 0;
static int lavc_param_mv0_threshold = 256;
static int lavc_param_refs = 1;
static int lavc_param_b_sensitivity = 40;
char *lavc_param_acodec = "mp2";
int lavc_param_atag = 0;
@ -323,6 +324,7 @@ m_option_t lavcopts_conf[]={
{"aglobal", &lavc_param_audio_global_header, CONF_TYPE_INT, CONF_RANGE, 0, INT_MAX, NULL},
{"mv0_threshold", &lavc_param_mv0_threshold, CONF_TYPE_INT, CONF_RANGE, 0, INT_MAX, NULL},
{"refs", &lavc_param_refs, CONF_TYPE_INT, CONF_RANGE, 1, 16, NULL},
{"b_sensitivity", &lavc_param_b_sensitivity, CONF_TYPE_INT, CONF_RANGE, 1, INT_MAX, NULL},
{NULL, NULL, 0, 0, 0, 0, NULL}
};
#endif
@ -655,6 +657,7 @@ static int config(struct vf_instance_s* vf,
}
lavc_venc_context->mv0_threshold = lavc_param_mv0_threshold;
lavc_venc_context->refs = lavc_param_refs;
lavc_venc_context->b_sensitivity = lavc_param_b_sensitivity;
switch(lavc_param_format)
{