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Merge "Further change to code detecting slide transitions."

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Paul Wilkins 2018-02-01 10:21:38 +00:00 committed by Gerrit Code Review
commit 79c14b83e9
1 changed files with 14 additions and 4 deletions
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18
vp9/encoder/vp9_firstpass.c
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@ -2699,13 +2699,24 @@ static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {
#endif
}
// Intra / Inter threshold very low
#define VERY_LOW_II 1.5
// Clean slide transitions we expect a sharp single frame spike in error.
#define ERROR_SPIKE 5.0
// Slide show transition detection.
// Tests for case where there is very low error either side of the current frame
// but much higher just for this frame. This can help detect key frames in
// slide shows even where the slides are pictures of different sizes.
// Also requires that intra and inter errors are very similar to help eliminate
// harmful false positives.
// It will not help if the transition is a fade or other multi-frame effect.
static int slide_transition(double this_err, double last_err, double next_err) {
return (this_err > (last_err * 5.0)) && (this_err > (next_err * 5.0));
static int slide_transition(const FIRSTPASS_STATS *this_frame,
const FIRSTPASS_STATS *last_frame,
const FIRSTPASS_STATS *next_frame) {
return (this_frame->intra_error < (this_frame->coded_error * VERY_LOW_II)) &&
(this_frame->coded_error > (last_frame->coded_error * ERROR_SPIKE)) &&
(this_frame->coded_error > (next_frame->coded_error * ERROR_SPIKE));
}
// Threshold for use of the lagging second reference frame. High second ref
@ -2752,8 +2763,7 @@ static int test_candidate_kf(TWO_PASS *twopass,
if ((this_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
(next_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
((this_frame->pcnt_inter < VERY_LOW_INTER_THRESH) ||
(slide_transition(this_frame->coded_error, last_frame->coded_error,
next_frame->coded_error)) ||
(slide_transition(this_frame, last_frame, next_frame)) ||
((pcnt_intra > MIN_INTRA_LEVEL) &&
(pcnt_intra > (INTRA_VS_INTER_THRESH * modified_pcnt_inter)) &&
((this_frame->intra_error /