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better scene change detection 

Originally committed as revision 858 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-08-22 19:41:06 +00:00
parent 90cee0c351
commit 1fb4890b51
3 changed files with 12 additions and 2 deletions
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8
libavcodec/motion_est.c
View File

@ -1183,6 +1183,7 @@ void ff_estimate_p_frame_motion(MpegEncContext * s,
sum= (sum+8)>>4;
varc = (pix_norm1(pix, s->linesize) - sum*sum + 500 + 128)>>8;
vard = (pix_norm(pix, ppix, s->linesize)+128)>>8;
//printf("%d %d %d %X %X %X\n", s->mb_width, mb_x, mb_y,(int)s, (int)s->mb_var, (int)s->mc_mb_var); fflush(stdout);
s->mb_var [s->mb_width * mb_y + mb_x] = varc;
s->mc_mb_var[s->mb_width * mb_y + mb_x] = vard;
@ -1195,6 +1196,11 @@ void ff_estimate_p_frame_motion(MpegEncContext * s,
varc, s->avg_mb_var, sum, vard, mx - xx, my - yy);
#endif
if(s->flags&CODEC_FLAG_HQ){
if (vard <= 64 || vard < varc)
s->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
else
s->scene_change_score+= 20;
if (vard*2 + 200 > varc)
mb_type|= MB_TYPE_INTRA;
if (varc*2 + 200 > vard){
@ -1221,6 +1227,7 @@ void ff_estimate_p_frame_motion(MpegEncContext * s,
set_p_mv_tables(s, mx, my, 1);
}else{
if (vard <= 64 || vard < varc) {
s->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
mb_type|= MB_TYPE_INTER;
if (s->me_method != ME_ZERO) {
if(s->me_method >= ME_EPZS)
@ -1251,6 +1258,7 @@ void ff_estimate_p_frame_motion(MpegEncContext * s,
}
#endif
}else{
s->scene_change_score+= 20;
mb_type|= MB_TYPE_INTRA;
mx = 0;
my = 0;

5
libavcodec/mpegvideo.c
View File

@ -1978,6 +1978,8 @@ static void encode_picture(MpegEncContext *s, int picture_number)
if (s->h263_pred && !s->h263_msmpeg4)
ff_set_mpeg4_time(s, s->picture_number);
s->scene_change_score=0;
/* Estimate motion for every MB */
if(s->pict_type != I_TYPE){
for(mb_y=0; mb_y < s->mb_height; mb_y++) {
@ -2009,8 +2011,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
memset(s->p_mv_table , 0, sizeof(INT16)*(s->mb_width+2)*(s->mb_height+2)*2);
memset(s->mb_type , MB_TYPE_INTRA, sizeof(UINT8)*s->mb_width*s->mb_height);
}
if(s->mb_var_sum < s->mc_mb_var_sum && s->pict_type == P_TYPE){ //FIXME subtract MV bits
if(s->scene_change_score > 0 && s->pict_type == P_TYPE){
s->pict_type= I_TYPE;
memset(s->mb_type , MB_TYPE_INTRA, sizeof(UINT8)*s->mb_width*s->mb_height);
if(s->max_b_frames==0){

1
libavcodec/mpegvideo.h
View File

@ -195,6 +195,7 @@ typedef struct MpegEncContext {
uint16_t *me_score_map; /* map to store the SADs */
int me_map_generation;
int skip_me; /* set if ME is skiped for the current MB */
int scene_change_score;
int mv_dir;
#define MV_DIR_BACKWARD 1
#define MV_DIR_FORWARD 2