[x265] [x265 Patch] Histogram Based Scene Cut Detection
Srikanth Kurapati
srikanth.kurapati at multicorewareinc.com
Tue Nov 19 09:13:37 CET 2019
1. Is this necessary? Can you make the latest option set to take effect?
Ans: Thats the normal behavior and how the cli is parsed. We had a
discussion on this.
1. to enable default method when user chooses both.
2. or enable latest - user's last choice.
3. to process only the users first choice.
We choose the last option.
That was how it was initially designed.
2. Will this work if --hist-scenecut is set after --hist-threshold in the
CLI?
No. It's mentioned in the documentation how to use the new cli options that
the method needs to be enabled before the threshold being set.
else in the case when only threshold is set and method is not enabled its
unnecessarily being processed again and again though its nor used in the
library.
Incase the user threshold is not read the default value will always be used
for processing.
3. float point comparison; might result in rounding errors.
- at the end of a high precision which is not the case for typical
thresholds set by user upto to 2 to 3 decimal places.
4. Also, why are you checking p->edgeTransitionThreshold when naive
scenecut algorithm is enabled?
- to handle the case when user has configured the wrong threshold but
since its unnecessary I will remove the same.
5. Please add one more CLI to test the functionality of hist-scenecut in
the absence of frame duplication.
- It has been discussed and decided to add only one for the full feature.
Should I still add the same.
6. This will affect backward compatibility. May I know how ?
Everywhere in the code we are setting the flags to true or false it
should be of type bool.
Will address the rest of the valid comments.
On Mon, Nov 18, 2019 at 11:06 PM Aruna Matheswaran <
aruna at multicorewareinc.com> wrote:
>
>
> On Mon, Nov 18, 2019 at 12:20 PM Srikanth Kurapati <
> srikanth.kurapati at multicorewareinc.com> wrote:
>
>> # HG changeset patch
>> # User Srikanth Kurapati <srikanth.kurapati at multicorewareinc.com>
>> # Date 1573649311 -19800
>> # Wed Nov 13 18:18:31 2019 +0530
>> # Node ID 40beab295ca274bf62cb2fd2e732da722d10eea3
>> # Parent 04db2bfee5d628d931d1407355b909ac8ff1c898
>> Histogram based scenecut detection
>>
>> This patch does the following.
>> 1.Identifies scenecuts by thresholding against sad of edge and chroma
>> histograms.
>> 2.Add option "--hist-scenecut" to enable histogram based scenecut method.
>> 3.Add option "--hist-threshold" to provide threshold for determining
>> scene-cuts.
>> 3.Optimizes frame duplication through reuse of sad for marking duplicate
>> frames.
>>
>> diff -r 04db2bfee5d6 -r 40beab295ca2 doc/reST/cli.rst
>> --- a/doc/reST/cli.rst Thu Oct 31 16:23:27 2019 +0530
>> +++ b/doc/reST/cli.rst Wed Nov 13 18:18:31 2019 +0530
>> @@ -1426,7 +1426,23 @@
>> This value represents the percentage difference between the inter cost
>> and
>> intra cost of a frame used in scenecut detection. For example, a value
>> of 5 indicates,
>> if the inter cost of a frame is greater than or equal to 95 percent of
>> the intra cost of the frame,
>> - then detect this frame as scenecut. Values between 5 and 15 are
>> recommended. Default 5.
>> + then detect this frame as scenecut. Values between 5 and 15 are
>> recommended.
>> + This value is evaluated only when --scenecut is enabled else it is
>> ignored. Default 5.
>> +
>> +.. option:: --hist-scenecut, --no-hist-scenecut
>> +
>> + indicates that scenecuts need to be detected using luma edge and chroma
>> histograms.
>>
> Case issue in "indicates".
>
>> + option: `--hist-scenecut` enables scenecut detection using the
>> histograms and disables the default scene cut algorithm.
>> + option: `--no-hist-scenecut` disables histogram based scenecut
>> algorithm.
>> +
>> + Note that if --hist-scenecut and --scenecut are enabled together the
>> first choice of user is considered for processing.
>> +
>> +.. option:: --hist-threshold <0.0..2.0>
>> +
>> + This value represents the threshold for normalized SAD of edge
>> histograms used in scenecut detection.
>> + This requires hist-scenecut to be enabled. For example, a value of 0.2
>> indicates that a frame with normalized SAD value
>>
> Add a link to hist-scenecut (option: `--hist-scenecut` )
>
>> + greater than 0.2 against the previous frame as scenecut.
>> + Default 0.01.
>>
>> .. option:: --radl <integer>
>>
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/CMakeLists.txt
>> --- a/source/CMakeLists.txt Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/CMakeLists.txt Wed Nov 13 18:18:31 2019 +0530
>> @@ -29,7 +29,7 @@
>> option(STATIC_LINK_CRT "Statically link C runtime for release builds"
>> OFF)
>> mark_as_advanced(FPROFILE_USE FPROFILE_GENERATE NATIVE_BUILD)
>> # X265_BUILD must be incremented each time the public API is changed
>> -set(X265_BUILD 182)
>> +set(X265_BUILD 183)
>> configure_file("${PROJECT_SOURCE_DIR}/x265.def.in"
>> "${PROJECT_BINARY_DIR}/x265.def")
>> configure_file("${PROJECT_SOURCE_DIR}/x265_config.h.in"
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/common/common.h
>> --- a/source/common/common.h Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/common/common.h Wed Nov 13 18:18:31 2019 +0530
>> @@ -129,12 +129,16 @@
>> typedef uint64_t sum2_t;
>> typedef uint64_t pixel4;
>> typedef int64_t ssum2_t;
>> +#define HISTOGRAM_BINS 1024
>> +#define SHIFT 1
>> #else
>> typedef uint8_t pixel;
>> typedef uint16_t sum_t;
>> typedef uint32_t sum2_t;
>> typedef uint32_t pixel4;
>> typedef int32_t ssum2_t; // Signed sum
>> +#define HISTOGRAM_BINS 256
>> +#define SHIFT 0
>> #endif // if HIGH_BIT_DEPTH
>>
>> #if X265_DEPTH < 10
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/common/param.cpp
>> --- a/source/common/param.cpp Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/common/param.cpp Wed Nov 13 18:18:31 2019 +0530
>> @@ -167,6 +167,8 @@
>> param->bFrameAdaptive = X265_B_ADAPT_TRELLIS;
>> param->bBPyramid = 1;
>> param->scenecutThreshold = 40; /* Magic number pulled in from x264 */
>> + param->edgeTransitionThreshold = 0.01;
>> + param->bHistBasedSceneCut = false;
>> param->lookaheadSlices = 8;
>> param->lookaheadThreads = 0;
>> param->scenecutBias = 5.0;
>> @@ -572,6 +574,7 @@
>> param->bframes = 0;
>> param->lookaheadDepth = 0;
>> param->scenecutThreshold = 0;
>> + param->bHistBasedSceneCut = false;
>> param->rc.cuTree = 0;
>> param->frameNumThreads = 1;
>> }
>> @@ -614,7 +617,7 @@
>> return 0;
>> }
>>
>> -static int x265_atobool(const char* str, bool& bError)
>> +static bool x265_atobool(const char* str, bool& bError)
>> {
>> if (!strcmp(str, "1") ||
>> !strcmp(str, "true") ||
>> @@ -764,6 +767,7 @@
>> bool bNameWasBool = false;
>> bool bValueWasNull = !value;
>> bool bExtraParams = false;
>> + static int scenecutChoice = -1;
>>
> Is this necessary? Can you make the latest option set to take effect?
>
>> char nameBuf[64];
>> static int count;
>>
>> @@ -920,11 +924,16 @@
>> OPT("lookahead-slices") p->lookaheadSlices = atoi(value);
>> OPT("scenecut")
>> {
>> - p->scenecutThreshold = atobool(value);
>> - if (bError || p->scenecutThreshold)
>> + if (scenecutChoice == -1)
>> {
>> - bError = false;
>> - p->scenecutThreshold = atoi(value);
>> + p->scenecutThreshold = atobool(value);
>> + if (bError || p->scenecutThreshold)
>> + {
>> + bError = false;
>> + p->scenecutThreshold = atoi(value);
>> + p->bHistBasedSceneCut = false;
>> + scenecutChoice = 0;
>> + }
>> }
>> }
>> OPT("temporal-layers") p->bEnableTemporalSubLayers = atobool(value);
>> @@ -1191,6 +1200,46 @@
>> OPT("opt-ref-list-length-pps") p->bOptRefListLengthPPS =
>> atobool(value);
>> OPT("multi-pass-opt-rps") p->bMultiPassOptRPS = atobool(value);
>> OPT("scenecut-bias") p->scenecutBias = atof(value);
>> + OPT("hist-scenecut")
>> + {
>> + if (scenecutChoice == -1)
>> + {
>> + p->bHistBasedSceneCut = atobool(value);
>> + if (bError)
>> + {
>> + bError = false;
>> + p->bHistBasedSceneCut = false;
>> + }
>> + if (p->bHistBasedSceneCut)
>> + {
>> + bError = false;
>> + p->scenecutThreshold = 0;
>> + scenecutChoice = 1;
>> + }
>> + }
>> + else
>> + {
>> + p->bHistBasedSceneCut = atobool(value);
>> + p->bHistBasedSceneCut = false;
>> + }
>> + }
>> + OPT("hist-threshold")
>> + {
>> + if (p->bHistBasedSceneCut)
>>
> Will this work if --hist-scenecut is set after --hist-threshold in the
> CLI?
>
>> + {
>> + p->edgeTransitionThreshold = atof(value);
>> + if (bError)
>> + {
>> + bError = false;
>> + p->edgeTransitionThreshold = 0.01;
>> + x265_log(p, X265_LOG_INFO, "Using default threshold
>> %.2lf for scene cut detection\n", p->edgeTransitionThreshold);
>> + }
>> + }
>> + else
>> + {
>> + x265_log(p, X265_LOG_WARNING, "Histogram based scene cut
>> detection not enabled\n", p->edgeTransitionThreshold);
>> + }
>> + }
>> OPT("lookahead-threads") p->lookaheadThreads = atoi(value);
>> OPT("opt-cu-delta-qp") p->bOptCUDeltaQP = atobool(value);
>> OPT("multi-pass-opt-analysis") p->analysisMultiPassRefine =
>> atobool(value);
>> @@ -1631,8 +1680,16 @@
>> "Valid Logging level -1:none 0:error 1:warning 2:info 3:debug
>> 4:full");
>> CHECK(param->scenecutThreshold < 0,
>> "scenecutThreshold must be greater than 0");
>> - CHECK(param->scenecutBias < 0 || 100 < param->scenecutBias,
>> - "scenecut-bias must be between 0 and 100");
>> + if (param->scenecutThreshold)
>> + {
>> + CHECK(param->scenecutBias < 0 || 100 < param->scenecutBias,
>> + "scenecut-bias must be between 0 and 100");
>> + }
>> + else if (param->bHistBasedSceneCut)
>> + {
>> + CHECK(param->edgeTransitionThreshold < 0.0 || 2.0 <
>> param->edgeTransitionThreshold,
>> + "hist-threshold must be between 0.0 and 2.0");
>> + }
>> CHECK(param->radl < 0 || param->radl > param->bframes,
>> "radl must be between 0 and bframes");
>> CHECK(param->rdPenalty < 0 || param->rdPenalty > 2,
>> @@ -1792,9 +1849,13 @@
>> x265_log(param, X265_LOG_INFO, "ME / range / subpel / merge
>> : %s / %d / %d / %d\n",
>> x265_motion_est_names[param->searchMethod],
>> param->searchRange, param->subpelRefine, param->maxNumMergeCand);
>>
>> - if (param->keyframeMax != INT_MAX || param->scenecutThreshold)
>> - x265_log(param, X265_LOG_INFO, "Keyframe min / max / scenecut /
>> bias: %d / %d / %d / %.2lf\n", param->keyframeMin, param->keyframeMax,
>> param->scenecutThreshold, param->scenecutBias * 100);
>> - else
>> + if (param->scenecutThreshold && param->keyframeMax != INT_MAX)
>> + x265_log(param, X265_LOG_INFO, "Keyframe min / max / scenecut /
>> bias : %d / %d / %d / %.2lf \n",
>> + param->keyframeMin, param->keyframeMax,
>> param->scenecutThreshold, param->scenecutBias * 100);
>> + else if (param->bHistBasedSceneCut && param->keyframeMax != INT_MAX)
>> + x265_log(param, X265_LOG_INFO, "Keyframe min / max / scenecut /
>> edge threshold : %d / %d / %d / %.2lf\n",
>> + param->keyframeMin, param->keyframeMax,
>> param->bHistBasedSceneCut, param->edgeTransitionThreshold);
>> + else if (param->keyframeMax == INT_MAX)
>> x265_log(param, X265_LOG_INFO, "Keyframe min / max / scenecut
>> : disabled\n");
>>
>> if (param->cbQpOffset || param->crQpOffset)
>> @@ -1961,6 +2022,8 @@
>> s += sprintf(s, " rc-lookahead=%d", p->lookaheadDepth);
>> s += sprintf(s, " lookahead-slices=%d", p->lookaheadSlices);
>> s += sprintf(s, " scenecut=%d", p->scenecutThreshold);
>> + s += sprintf(s, " hist-scenecut=%d", p->bHistBasedSceneCut);
>> + s += sprintf(s, " hist-threshold=%.2f", p->edgeTransitionThreshold);
>> s += sprintf(s, " radl=%d", p->radl);
>> BOOL(p->bEnableHRDConcatFlag, "splice");
>> BOOL(p->bIntraRefresh, "intra-refresh");
>> @@ -2108,6 +2171,8 @@
>> BOOL(p->bOptRefListLengthPPS, "opt-ref-list-length-pps");
>> BOOL(p->bMultiPassOptRPS, "multi-pass-opt-rps");
>> s += sprintf(s, " scenecut-bias=%.2f", p->scenecutBias);
>> + s += sprintf(s, " hist-threshold=%.2f", p->edgeTransitionThreshold);
>> +
>>
>
> Added twice; Please remove one.
>>
> BOOL(p->bOptCUDeltaQP, "opt-cu-delta-qp");
>> BOOL(p->bAQMotion, "aq-motion");
>> BOOL(p->bEmitHDRSEI, "hdr");
>> @@ -2261,6 +2326,7 @@
>> dst->lookaheadSlices = src->lookaheadSlices;
>> dst->lookaheadThreads = src->lookaheadThreads;
>> dst->scenecutThreshold = src->scenecutThreshold;
>> + dst->bHistBasedSceneCut = src->bHistBasedSceneCut;
>> dst->bIntraRefresh = src->bIntraRefresh;
>> dst->maxCUSize = src->maxCUSize;
>> dst->minCUSize = src->minCUSize;
>> @@ -2420,6 +2486,7 @@
>> dst->bOptRefListLengthPPS = src->bOptRefListLengthPPS;
>> dst->bMultiPassOptRPS = src->bMultiPassOptRPS;
>> dst->scenecutBias = src->scenecutBias;
>> + dst->edgeTransitionThreshold = src->edgeTransitionThreshold;
>> dst->gopLookahead = src->lookaheadDepth;
>> dst->bOptCUDeltaQP = src->bOptCUDeltaQP;
>> dst->analysisMultiPassDistortion = src->analysisMultiPassDistortion;
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/encoder/encoder.cpp
>> --- a/source/encoder/encoder.cpp Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/encoder/encoder.cpp Wed Nov 13 18:18:31 2019 +0530
>> @@ -130,12 +130,17 @@
>> #if SVT_HEVC
>> m_svtAppData = NULL;
>> #endif
>> -
>> m_prevTonemapPayload.payload = NULL;
>> m_startPoint = 0;
>> m_saveCTUSize = 0;
>> + m_edgePic = NULL;
>> + m_edgeHistThreshold = 0;
>> + m_chromaHistThreshold = 0.0;
>> + m_scaledEdgeThreshold = 0.0;
>> + m_scaledChromaThreshold = 0.0;
>> m_zoneIndex = 0;
>> }
>> +
>> inline char *strcatFilename(const char *input, const char *suffix)
>> {
>> char *output = X265_MALLOC(char, strlen(input) + strlen(suffix) + 1);
>> @@ -210,6 +215,24 @@
>> }
>> }
>>
>> + if (m_param->bHistBasedSceneCut)
>> + {
>> + for (int i = 0; i < x265_cli_csps[m_param->internalCsp].planes;
>> i++)
>> + {
>> + m_planeSizes[i] = m_param->sourceWidth *
>> m_param->sourceHeight >> x265_cli_csps[m_param->internalCsp].height[i];
>> + }
>> + uint32_t pixelbytes = m_param->sourceBitDepth > 8 ? 2 : 1;
>> + m_edgePic = X265_MALLOC(pixel, m_planeSizes[0]*pixelbytes);
>>
> Indentation issue // m_planeSizes[0]*pixelbytes
>
>> + double strengthFactor = 2.0;
>>
> Replace the constant with a macro
>
>> + m_edgeHistThreshold = m_param->edgeTransitionThreshold;
>> + m_chromaHistThreshold = m_edgeHistThreshold * 10.0;
>> + m_chromaHistThreshold = x265_min(m_chromaHistThreshold,
>> MAX_SCENECUT_THRESHOLD);
>> + m_scaledEdgeThreshold = m_edgeHistThreshold * strengthFactor;
>> + m_scaledEdgeThreshold = x265_min(m_scaledEdgeThreshold,
>> MAX_SCENECUT_THRESHOLD);
>> + m_scaledChromaThreshold = m_chromaHistThreshold * strengthFactor;
>> + m_scaledChromaThreshold = x265_min(m_scaledChromaThreshold,
>> MAX_SCENECUT_THRESHOLD);
>> + }
>> +
>> // Do not allow WPP if only one row or fewer than 3 columns, it is
>> pointless and unstable
>> if (rows == 1 || cols < 3)
>> {
>> @@ -854,6 +877,12 @@
>> }
>> }
>>
>> + if (m_param->bHistBasedSceneCut)
>> + {
>> + if(m_edgePic != NULL)
>> + X265_FREE_ZERO(m_edgePic);
>> + }
>> +
>> for (int i = 0; i < m_param->frameNumThreads; i++)
>> {
>> if (m_frameEncoder[i])
>> @@ -1313,6 +1342,141 @@
>> dest->planes[2] = (char*)dest->planes[1] + src->stride[1] *
>> (src->height >> x265_cli_csps[src->colorSpace].height[1]);
>> }
>>
>> +bool Encoder::computeHistograms(x265_picture *pic)
>> +{
>> + pixel *src = (pixel*)pic->planes[0];
>> + size_t bufSize = sizeof(pixel) * m_planeSizes[0];
>> + int32_t planeCount = x265_cli_csps[m_param->internalCsp].planes;
>> + int32_t numBytes = m_param->sourceBitDepth > 8 ? 2 : 1;
>> + memset(m_edgePic, 0, bufSize*numBytes);
>> +
>> + if (!computeEdge(m_edgePic, src, NULL, pic->width, pic->height,
>> pic->width, false))
>> + {
>> + x265_log(m_param, X265_LOG_ERROR, "Failed edge computation!");
>> + return false;
>> + }
>> +
>> + pixel pixelVal;
>> + int64_t size = pic->height * (pic->stride[0] >> SHIFT);
>> + int32_t *edgeHist = m_curEdgeHist;
>> + memset(edgeHist, 0, 2 * sizeof(int32_t));
>> + for (int64_t i = 0; i < size; i++)
>> + {
>> + if (!m_edgePic[i])
>> + edgeHist[0]++;
>> + else
>> + edgeHist[1]++;
>> + }
>> +
>> + /*U Histogram Calculation*/
>> + int32_t HeightL = (pic->height >>
>> x265_cli_csps[pic->colorSpace].height[1]);
>> + size = HeightL * (pic->stride[1] >> SHIFT);
>> + int32_t *uHist = m_curUVHist[0];
>> + pixel *chromaPlane = (pixel *)pic->planes[1];
>>
> Encoder crashes with X265_CSP_I400 input; You need to check the CSP type
> before accessing the UV planes.
>
>> +
>>
> + memset(uHist, 0, HISTOGRAM_BINS * sizeof(int32_t));
>> +
>> + for (int64_t i = 0; i < size; i++)
>> + {
>> + pixelVal = chromaPlane[i];
>> + uHist[pixelVal]++;
>> + }
>> +
>> + /*V Histogram Calculation */
>> + if (planeCount == 3)
>>
> + {
>> + pixelVal = 0;
>> + int32_t heightV = (pic->height >>
>> x265_cli_csps[pic->colorSpace].height[2]);
>> + size = heightV * (pic->stride[2] >> SHIFT);
>> + int32_t *vHist = m_curUVHist[1];
>> + chromaPlane = (pixel *)pic->planes[2];
>> +
>> + memset(vHist, 0, HISTOGRAM_BINS * sizeof(int32_t));
>> + for (int64_t i = 0; i < size; i++)
>> + {
>> + pixelVal = chromaPlane[i];
>> + vHist[pixelVal]++;
>> + }
>> + for (int i = 0; i < HISTOGRAM_BINS; i++)
>> + {
>> + m_curMaxUVHist[i] = x265_max(uHist[i],vHist[i]);
>>
> Intendation issue
>
>> + }
>> + }
>> + else
>> + { /* in case of bi planar color space */
>> +
>> memcpy(m_curMaxUVHist,m_curUVHist[0],HISTOGRAM_BINS*sizeof(int32_t));
>>
> Intendation issue
>
>> + }
>> +
>> + return true;
>> +}
>> +
>> +void Encoder::computeHistogramSAD(double *maxUVNormalizedSad, double
>> *edgeNormalizedSad, int curPoc)
>> +{
>> +
>> + if (curPoc == 0)
>> + { /* first frame is scenecut by default no sad computation for the
>> same. */
>> + *maxUVNormalizedSad = 0.0;
>> + *edgeNormalizedSad = 0.0;
>> + }
>> + else
>> + {
>> + /* compute sum of absolute difference of normalized histogram
>> bins for maxUV and edge histograms. */
>> + int32_t edgefreqDiff = 0;
>> + int32_t maxUVfreqDiff = 0;
>> + double edgeProbabilityDiff = 0;
>> +
>> + for (int j = 0; j < HISTOGRAM_BINS; j++)
>> + {
>> + if (j < 2 )
>>
> indentation issue
>
>> + {
>> + edgefreqDiff = abs(m_curEdgeHist[j] - m_prevEdgeHist[j]);
>> + edgeProbabilityDiff = (double) edgefreqDiff /
>> m_planeSizes[0];
>> + *edgeNormalizedSad += edgeProbabilityDiff;
>> + }
>> + maxUVfreqDiff = abs(m_curMaxUVHist[j] - m_prevMaxUVHist[j]);
>> + *maxUVNormalizedSad += (double)maxUVfreqDiff /
>> m_planeSizes[2];
>> + }
>> + }
>> +
>> + /* store histograms of previous frame for reference */
>> + size_t bufsize = HISTOGRAM_BINS * sizeof(int32_t);
>> + memcpy(m_prevMaxUVHist, m_curMaxUVHist, bufsize);
>> + memcpy(m_prevEdgeHist, m_curEdgeHist, 2*sizeof(int32_t));
>>
> indentation issue
>
>> +
>> +}
>> +
>> +void Encoder::findSceneCuts(x265_picture * pic, bool& bDup, double
>> maxUVSad, double edgeSad)
>> +{
>> + pic->frameData.bScenecut = false;
>> +
>> + if (pic->poc == 0)
>> + {
>> + /* for first frame */
>> + pic->frameData.bScenecut = false;
>> + bDup = false;
>> + }
>> + else
>> + {
>> + if (edgeSad == 0.0 && maxUVSad == 0.0)
>> + {
>> + bDup = true;
>> + }
>> + else if (edgeSad > m_edgeHistThreshold && maxUVSad >=
>> m_chromaHistThreshold)
>> + {
>> + pic->frameData.bScenecut = true;
>> + bDup = false;
>> + }
>> + else if (edgeSad > m_scaledEdgeThreshold || maxUVSad >=
>> m_scaledChromaThreshold)
>> + {
>> + pic->frameData.bScenecut = true;
>> + bDup = false;
>> + }
>> + }
>> +
>> + if (pic->frameData.bScenecut)
>> + x265_log(m_param, X265_LOG_DEBUG, "scene cut at %d \n",pic->poc);
>>
> indentation issue
>
>> +}
>> +
>> /**
>> * Feed one new input frame into the encoder, get one frame out. If
>> pic_in is
>> * NULL, a flush condition is implied and pic_in must be NULL for all
>> subsequent
>> @@ -1339,6 +1503,8 @@
>> const x265_picture* inputPic = NULL;
>> static int written = 0, read = 0;
>> bool dontRead = false;
>> + bool bdropFrame = false;
>> + bool dropflag = false;
>>
>> if (m_exportedPic)
>> {
>> @@ -1350,6 +1516,17 @@
>> }
>> if ((pic_in && (!m_param->chunkEnd || (m_encodedFrameNum <
>> m_param->chunkEnd))) || (m_param->bEnableFrameDuplication && !pic_in &&
>> (read < written)))
>> {
>> + if (m_param->bHistBasedSceneCut && pic_in)
>> + {
>> + x265_picture *pic = (x265_picture *) pic_in;
>> + if (computeHistograms(pic))
>> + {
>> + double maxUVSad = 0.0, edgeSad = 0.0;
>> + computeHistogramSAD(&maxUVSad, &edgeSad,pic_in->poc);
>>
> indentation issue.
>
>> + findSceneCuts(pic, bdropFrame, maxUVSad, edgeSad);
>> + }
>> + }
>> +
>> if ((m_param->bEnableFrameDuplication && !pic_in && (read <
>> written)))
>> dontRead = true;
>> else
>> @@ -1393,9 +1570,27 @@
>> written++;
>> }
>>
>> - psnrWeight = ComputePSNR(m_dupBuffer[0]->dupPic,
>> m_dupBuffer[1]->dupPic, m_param);
>> -
>> - if (psnrWeight >= m_param->dupThreshold)
>> + if (m_param->bEnableFrameDuplication &&
>> m_param->bHistBasedSceneCut)
>> + {
>> + if (!bdropFrame &&
>> m_dupBuffer[1]->dupPic->frameData.bScenecut == false)
>> + {
>> + psnrWeight = ComputePSNR(m_dupBuffer[0]->dupPic,
>> m_dupBuffer[1]->dupPic, m_param);
>> + if (psnrWeight >= m_param->dupThreshold)
>> + dropflag = true;
>> + }
>> + else
>> + {
>> + dropflag = true;
>> + }
>> + }
>> + else if (m_param->bEnableFrameDuplication)
>> + {
>> + psnrWeight = ComputePSNR(m_dupBuffer[0]->dupPic,
>> m_dupBuffer[1]->dupPic, m_param);
>> + if (psnrWeight >= m_param->dupThreshold)
>> + dropflag = true;
>> + }
>> +
>> + if (dropflag)
>> {
>> if (m_dupBuffer[0]->bDup)
>> {
>> @@ -1498,6 +1693,10 @@
>> inFrame->m_poc = ++m_pocLast;
>> inFrame->m_userData = inputPic->userData;
>> inFrame->m_pts = inputPic->pts;
>> + if (m_param->bHistBasedSceneCut)
>> + {
>> + inFrame->m_lowres.bScenecut = inputPic->frameData.bScenecut;
>> + }
>> inFrame->m_forceqp = inputPic->forceqp;
>> inFrame->m_param = (m_reconfigure || m_reconfigureRc) ?
>> m_latestParam : m_param;
>> inFrame->m_picStruct = inputPic->picStruct;
>> @@ -3209,6 +3408,7 @@
>> * adaptive I frame placement */
>> p->keyframeMax = INT_MAX;
>> p->scenecutThreshold = 0;
>> + p->bHistBasedSceneCut = 0;
>> }
>> else if (p->keyframeMax <= 1)
>> {
>> @@ -3222,6 +3422,7 @@
>> p->lookaheadDepth = 0;
>> p->bframes = 0;
>> p->scenecutThreshold = 0;
>> + p->bHistBasedSceneCut = 0;
>> p->bFrameAdaptive = 0;
>> p->rc.cuTree = 0;
>> p->bEnableWeightedPred = 0;
>> @@ -3881,6 +4082,17 @@
>> m_param->searchMethod = m_param->hmeSearchMethod[2];
>> }
>> }
>> +
>> + if (p->scenecutThreshold && p->edgeTransitionThreshold != 0.01)
>> + {
>>
> float point comparison; might result in rounding errors.
> Also, why are you checking p->edgeTransitionThreshold when naive scenecut
> algorithm is enabled?
>
>> + x265_log(p, X265_LOG_WARNING, "using default scenecut-bias %.2lf
>> for scene cut detection\n",p->scenecutBias);
>> + }
>> + else if (p->bHistBasedSceneCut && p->edgeTransitionThreshold == 0.0)
>>
> float point comparison; might result in rounding errors.
>
>> + {
>> + p->edgeTransitionThreshold = 0.01;
>> + x265_log(p, X265_LOG_WARNING, "using default threshold %.2lf
>> for scene cut detection\n", p->edgeTransitionThreshold);
>> + }
>> +
>> }
>>
>> void Encoder::readAnalysisFile(x265_analysis_data* analysis, int curPoc,
>> const x265_picture* picIn, int paramBytes)
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/encoder/encoder.h
>> --- a/source/encoder/encoder.h Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/encoder/encoder.h Wed Nov 13 18:18:31 2019 +0530
>> @@ -156,7 +156,6 @@
>> bool bDup;
>> };
>>
>> -
>> class FrameEncoder;
>> class DPB;
>> class Lookahead;
>> @@ -164,6 +163,8 @@
>> class ThreadPool;
>> class FrameData;
>>
>> +#define MAX_SCENECUT_THRESHOLD 2.0
>> +
>> class Encoder : public x265_encoder
>> {
>> public:
>> @@ -228,7 +229,7 @@
>> bool m_reconfigureRc;
>> bool m_reconfigureZone;
>>
>> - int m_saveCtuDistortionLevel;
>> + int m_saveCtuDistortionLevel;
>>
>> /* Begin intra refresh when one not in progress or else begin one as
>> soon as the current
>> * one is done. Requires bIntraRefresh to be set.*/
>> @@ -245,11 +246,24 @@
>> Lock m_rpsInSpsLock;
>> int m_rpsInSpsCount;
>> /* For HDR*/
>> - double m_cB;
>> - double m_cR;
>> + double m_cB;
>> + double m_cR;
>> +
>> + int m_bToneMap; // Enables tone-mapping
>> + int m_enableNal;
>>
>> - int m_bToneMap; // Enables tone-mapping
>> - int m_enableNal;
>> + /* For histogram based scene-cut detection */
>> + pixel* m_edgePic;
>> + int32_t m_curUVHist[2][HISTOGRAM_BINS];
>> + int32_t m_curMaxUVHist[HISTOGRAM_BINS];
>> + int32_t m_prevMaxUVHist[HISTOGRAM_BINS];
>> + int32_t m_curEdgeHist[2];
>> + int32_t m_prevEdgeHist[2];
>> + uint32_t m_planeSizes[3];
>> + double m_edgeHistThreshold;
>> + double m_chromaHistThreshold;
>> + double m_scaledEdgeThreshold;
>> + double m_scaledChromaThreshold;
>>
>> #ifdef ENABLE_HDR10_PLUS
>> const hdr10plus_api *m_hdr10plus_api;
>> @@ -355,6 +369,10 @@
>>
>> void copyPicture(x265_picture *dest, const x265_picture *src);
>>
>> + bool computeHistograms(x265_picture *pic);
>> + void computeHistogramSAD(double *maxUVNormalizedSAD, double
>> *edgeNormalizedSAD, int curPoc);
>> + void findSceneCuts(x265_picture * pic, bool& bDup, double
>> m_maxUVSADVal, double m_edgeSADVal);
>> +
>> void initRefIdx();
>> void analyseRefIdx(int *numRefIdx);
>> void updateRefIdx();
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/encoder/ratecontrol.cpp
>> --- a/source/encoder/ratecontrol.cpp Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/encoder/ratecontrol.cpp Wed Nov 13 18:18:31 2019 +0530
>> @@ -508,6 +508,7 @@
>> CMP_OPT_FIRST_PASS("open-gop", m_param->bOpenGOP);
>> CMP_OPT_FIRST_PASS(" keyint", m_param->keyframeMax);
>> CMP_OPT_FIRST_PASS("scenecut",
>> m_param->scenecutThreshold);
>> + CMP_OPT_FIRST_PASS("hist-threshold",
>> m_param->edgeTransitionThreshold);
>> CMP_OPT_FIRST_PASS("intra-refresh",
>> m_param->bIntraRefresh);
>> if (m_param->bMultiPassOptRPS)
>> {
>> @@ -1200,6 +1201,7 @@
>> m_param->rc.bStatRead = 0;
>> m_param->bFrameAdaptive = 0;
>> m_param->scenecutThreshold = 0;
>> + m_param->bHistBasedSceneCut = false;
>> m_param->rc.cuTree = 0;
>> if (m_param->bframes > 1)
>> m_param->bframes = 1;
>> @@ -2284,7 +2286,7 @@
>> if (m_isVbv && m_currentSatd > 0 && curFrame)
>> {
>> if (m_param->lookaheadDepth || m_param->rc.cuTree ||
>> - m_param->scenecutThreshold ||
>> + (m_param->scenecutThreshold || m_param->bHistBasedSceneCut)
>> ||
>> (m_param->bFrameAdaptive && m_param->bframes))
>> {
>> /* Lookahead VBV: If lookahead is done, raise the quantizer
>> as necessary
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/encoder/slicetype.cpp
>> --- a/source/encoder/slicetype.cpp Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/encoder/slicetype.cpp Wed Nov 13 18:18:31 2019 +0530
>> @@ -85,6 +85,69 @@
>>
>> } // end anonymous namespace
>>
>> +namespace X265_NS {
>> +
>> +bool computeEdge(pixel *edgePic, pixel *refPic, pixel *edgeTheta,
>> intptr_t stride, int height, int width, bool bcalcTheta)
>> +{
>> + intptr_t rowOne = 0, rowTwo = 0, rowThree = 0, colOne = 0, colTwo =
>> 0, colThree = 0;
>> + intptr_t middle = 0, topLeft = 0, topRight = 0, bottomLeft = 0,
>> bottomRight = 0;
>> +
>> + const int startIndex = 1;
>> +
>> + if (!edgePic || !refPic || (!edgeTheta && bcalcTheta))
>> + {
>> + return false;
>> + }
>> + else
>> + {
>> + float gradientH = 0, gradientV = 0, radians = 0, theta = 0;
>> + float gradientMagnitude = 0;
>> + pixel blackPixel = 0;
>> +
>> + //Applying Sobel filter expect for border pixels
>> + height = height - startIndex;
>> + width = width - startIndex;
>> + for (int rowNum = startIndex; rowNum < height; rowNum++)
>> + {
>> + rowTwo = rowNum * stride;
>> + rowOne = rowTwo - stride;
>> + rowThree = rowTwo + stride;
>> +
>> + for (int colNum = startIndex; colNum < width; colNum++)
>> + {
>> +
>> + /* Horizontal and vertical gradients
>> + [ -3 0 3 ] [-3 -10 -3 ]
>> + gH =[ -10 0 10] gV = [ 0 0 0 ]
>> + [ -3 0 3 ] [ 3 10 3 ] */
>> +
>> + colTwo = colNum;
>> + colOne = colTwo - startIndex;
>> + colThree = colTwo + startIndex;
>> + middle = rowTwo + colTwo;
>> + topLeft = rowOne + colOne;
>> + topRight = rowOne + colThree;
>> + bottomLeft = rowThree + colOne;
>> + bottomRight = rowThree + colThree;
>> + gradientH = (float)(-3 * refPic[topLeft] + 3 *
>> refPic[topRight] - 10 * refPic[rowTwo + colOne] + 10 * refPic[rowTwo +
>> colThree] - 3 * refPic[bottomLeft] + 3 * refPic[bottomRight]);
>> + gradientV = (float)(-3 * refPic[topLeft] - 10 *
>> refPic[rowOne + colTwo] - 3 * refPic[topRight] + 3 * refPic[bottomLeft] +
>> 10 * refPic[rowThree + colTwo] + 3 * refPic[bottomRight]);
>> + gradientMagnitude = sqrtf(gradientH * gradientH +
>> gradientV * gradientV);
>> + if(bcalcTheta)
>> + {
>> + edgeTheta[middle] = 0;
>> + radians = atan2(gradientV, gradientH);
>> + theta = (float)((radians * 180) / PI);
>> + if (theta < 0)
>> + theta = 180 + theta;
>> + edgeTheta[middle] = (pixel)theta;
>> + }
>> + edgePic[middle] = (pixel)(gradientMagnitude >=
>> edgeThreshold ? edgeThreshold : blackPixel);
>> + }
>> + }
>> + return true;
>> + }
>> +}
>> +
>> void edgeFilter(Frame *curFrame, x265_param* param)
>> {
>> int height = curFrame->m_fencPic->m_picHeight;
>> @@ -114,6 +177,7 @@
>> //Applying Gaussian filter on the picture
>> src = (pixel*)curFrame->m_fencPic->m_picOrg[0];
>> refPic = curFrame->m_gaussianPic +
>> curFrame->m_fencPic->m_lumaMarginY * stride +
>> curFrame->m_fencPic->m_lumaMarginX;
>> + edgePic = curFrame->m_edgePic + curFrame->m_fencPic->m_lumaMarginY *
>> stride + curFrame->m_fencPic->m_lumaMarginX;
>> pixel pixelValue = 0;
>>
>> for (int rowNum = 0; rowNum < height; rowNum++)
>> @@ -146,51 +210,8 @@
>> }
>> }
>>
>> -#if HIGH_BIT_DEPTH //10-bit build
>> - float threshold = 1023;
>> - pixel whitePixel = 1023;
>> -#else
>> - float threshold = 255;
>> - pixel whitePixel = 255;
>> -#endif
>> -#define PI 3.14159265
>> -
>> - float gradientH = 0, gradientV = 0, radians = 0, theta = 0;
>> - float gradientMagnitude = 0;
>> - pixel blackPixel = 0;
>> - edgePic = curFrame->m_edgePic + curFrame->m_fencPic->m_lumaMarginY *
>> stride + curFrame->m_fencPic->m_lumaMarginX;
>> - //Applying Sobel filter on the gaussian filtered picture
>> - for (int rowNum = 0; rowNum < height; rowNum++)
>> - {
>> - for (int colNum = 0; colNum < width; colNum++)
>> - {
>> - edgeTheta[(rowNum*stride) + colNum] = 0;
>> - if ((rowNum != 0) && (colNum != 0) && (rowNum != height - 1)
>> && (colNum != width - 1)) //Ignoring the border pixels of the picture
>> - {
>> - /*Horizontal and vertical gradients
>> - [ -3 0 3 ] [-3 -10 -3 ]
>> - gH = [ -10 0 10] gV = [ 0 0 0 ]
>> - [ -3 0 3 ] [ 3 10 3 ]*/
>> -
>> - const intptr_t rowOne = (rowNum - 1)*stride, colOne =
>> colNum -1;
>> - const intptr_t rowTwo = rowNum * stride, colTwo = colNum;
>> - const intptr_t rowThree = (rowNum + 1)*stride, colThree
>> = colNum + 1;
>> - const intptr_t index = (rowNum*stride) + colNum;
>> -
>> - gradientH = (float)(-3 * refPic[rowOne + colOne] + 3 *
>> refPic[rowOne + colThree] - 10 * refPic[rowTwo + colOne] + 10 *
>> refPic[rowTwo + colThree] - 3 * refPic[rowThree + colOne] + 3 *
>> refPic[rowThree + colThree]);
>> - gradientV = (float)(-3 * refPic[rowOne + colOne] - 10 *
>> refPic[rowOne + colTwo] - 3 * refPic[rowOne + colThree] + 3 *
>> refPic[rowThree + colOne] + 10 * refPic[rowThree + colTwo] + 3 *
>> refPic[rowThree + colThree]);
>> -
>> - gradientMagnitude = sqrtf(gradientH * gradientH +
>> gradientV * gradientV);
>> - radians = atan2(gradientV, gradientH);
>> - theta = (float)((radians * 180) / PI);
>> - if (theta < 0)
>> - theta = 180 + theta;
>> - edgeTheta[(rowNum*stride) + colNum] = (pixel)theta;
>> -
>> - edgePic[index] = gradientMagnitude >= threshold ?
>> whitePixel : blackPixel;
>> - }
>> - }
>> - }
>> + if(!computeEdge(edgePic, refPic, edgeTheta, stride, height, width,
>> true))
>> + x265_log(NULL, X265_LOG_ERROR, "Failed edge computation!");
>> }
>>
>> //Find the angle of a block by averaging the pixel angles
>> @@ -1471,7 +1492,7 @@
>>
>> if (m_lastNonB && !m_param->rc.bStatRead &&
>> ((m_param->bFrameAdaptive && m_param->bframes) ||
>> - m_param->rc.cuTree || m_param->scenecutThreshold ||
>> + m_param->rc.cuTree || m_param->scenecutThreshold ||
>> m_param->bHistBasedSceneCut ||
>> (m_param->lookaheadDepth && m_param->rc.vbvBufferSize)))
>> {
>> slicetypeAnalyse(frames, false);
>> @@ -1971,10 +1992,15 @@
>>
>> int numBFrames = 0;
>> int numAnalyzed = numFrames;
>> - bool isScenecut = scenecut(frames, 0, 1, true, origNumFrames);
>> + bool isScenecut = false;
>>
>> /* When scenecut threshold is set, use scenecut detection for I
>> frame placements */
>> - if (m_param->scenecutThreshold && isScenecut)
>> + if (m_param->scenecutThreshold)
>> + isScenecut = scenecut(frames, 0, 1, true, origNumFrames);
>> + else if (m_param->bHistBasedSceneCut)
>> + isScenecut = frames[1]->bScenecut;
>> +
>> + if (isScenecut)
>> {
>> frames[1]->sliceType = X265_TYPE_I;
>> return;
>> @@ -1985,14 +2011,17 @@
>> m_extendGopBoundary = false;
>> for (int i = m_param->bframes + 1; i < origNumFrames; i +=
>> m_param->bframes + 1)
>> {
>> - scenecut(frames, i, i + 1, true, origNumFrames);
>> + if (m_param->scenecutThreshold)
>> + scenecut(frames, i, i + 1, true, origNumFrames);
>> +
>> for (int j = i + 1; j <= X265_MIN(i + m_param->bframes + 1,
>> origNumFrames); j++)
>> {
>> - if (frames[j]->bScenecut && scenecutInternal(frames, j -
>> 1, j, true) )
>> - {
>> - m_extendGopBoundary = true;
>> - break;
>> - }
>> + if (( m_param->scenecutThreshold && frames[j]->bScenecut
>> && scenecutInternal(frames, j - 1, j, true)) ||
>> + (m_param->bHistBasedSceneCut &&
>> frames[j]->bScenecut))
>> + {
>> + m_extendGopBoundary = true;
>> + break;
>> + }
>> }
>> if (m_extendGopBoundary)
>> break;
>> @@ -2097,13 +2126,14 @@
>> {
>> for (int j = 1; j < numBFrames + 1; j++)
>> {
>> - if (scenecut(frames, j, j + 1, false, origNumFrames) ||
>> + if ((m_param->scenecutThreshold && scenecut(frames, j, j
>> + 1, false, origNumFrames)) ||
>> + (m_param->bHistBasedSceneCut && frames[j +
>> 1]->bScenecut) ||
>> (bForceRADL && (frames[j]->frameNum == preRADL)))
>> - {
>> - frames[j]->sliceType = X265_TYPE_P;
>> - numAnalyzed = j;
>> - break;
>> - }
>> + {
>> + frames[j]->sliceType = X265_TYPE_P;
>> + numAnalyzed = j;
>> + break;
>> + }
>> }
>> }
>> resetStart = bKeyframe ? 1 : X265_MIN(numBFrames + 2,
>> numAnalyzed + 1);
>> @@ -3289,3 +3319,5 @@
>> fenc->rowSatds[b - p0][p1 - b][cuY] += bcostAq;
>> fenc->lowresCosts[b - p0][p1 - b][cuXY] = (uint16_t)(X265_MIN(bcost,
>> LOWRES_COST_MASK) | (listused << LOWRES_COST_SHIFT));
>> }
>> +
>> +}
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/encoder/slicetype.h
>> --- a/source/encoder/slicetype.h Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/encoder/slicetype.h Wed Nov 13 18:18:31 2019 +0530
>> @@ -43,6 +43,13 @@
>> #define AQ_EDGE_BIAS 0.5
>> #define EDGE_INCLINATION 45
>>
>> +#ifdef HIGH_BIT_DEPTH
>> +#define edgeThreshold 1023.0
>> +#else
>> +#define edgeThreshold 255.0
>> +#endif
>> +#define PI 3.14159265
>> +
>> /* Thread local data for lookahead tasks */
>> struct LookaheadTLD
>> {
>> @@ -258,6 +265,7 @@
>> CostEstimateGroup& operator=(const CostEstimateGroup&);
>> };
>>
>> -}
>> +bool computeEdge(pixel *edgePic, pixel *refPic, pixel *edgeTheta,
>> intptr_t stride, int height, int width, bool bcalcTheta);
>>
>> +}
>> #endif // ifndef X265_SLICETYPE_H
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/test/regression-tests.txt
>> --- a/source/test/regression-tests.txt Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/test/regression-tests.txt Wed Nov 13 18:18:31 2019 +0530
>> @@ -159,6 +159,7 @@
>> Traffic_4096x2048_30p.y4m, --preset medium --frame-dup --dup-threshold
>> 60 --hrd --bitrate 10000 --vbv-bufsize 15000 --vbv-maxrate 12000
>> Kimono1_1920x1080_24_400.yuv,--preset superfast --qp 28 --zones
>> 0,139,q=32
>> Island_960x540_420p_8bit_24fps.yuv,--no-cutree --aq-mode 0 --bitrate
>> 6000 --scenecut-aware-qp
>> +sintel_trailer_2k_1920x1080_24.yuv, --preset medium --hist-scenecut
>> --hist-threshold 0.02 --frame-dup --dup-threshold 60 --hrd --bitrate 10000
>> --vbv-bufsize 15000 --vbv-maxrate 12000
>>
> Please add one more CLI to test the functionality of hist-scenecut in the
> absence of frame duplication.
>
>>
>> # Main12 intraCost overflow bug test
>> 720p50_parkrun_ter.y4m,--preset medium
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/x265.h
>> --- a/source/x265.h Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/x265.h Wed Nov 13 18:18:31 2019 +0530
>> @@ -211,7 +211,7 @@
>> uint32_t numCUsInFrame;
>> uint32_t numPartitions;
>> uint32_t depthBytes;
>> - int bScenecut;
>> + bool bScenecut;
>>
> This will affect backward compatibility.
>
>> x265_weight_param* wt;
>> x265_analysis_inter_data* interData;
>> x265_analysis_intra_data* intraData;
>> @@ -294,7 +294,7 @@
>> double avgChromaVLevel;
>>
>> char sliceType;
>> - int bScenecut;
>> + bool bScenecut;
>>
> Affects backward compatibility.
>
>> double ipCostRatio;
>> int frameLatency;
>> x265_cu_stats cuStats;
>> @@ -1024,7 +1024,8 @@
>> int lookaheadSlices;
>>
>> /* An arbitrary threshold which determines how aggressively the
>> lookahead
>> - * should detect scene cuts. The default (40) is recommended. */
>> + * should detect scene cuts for cost based scenecut detection.
>> + * The default (40) is recommended. */
>> int scenecutThreshold;
>>
>> /* Replace keyframes by using a column of intra blocks that move
>> across the video
>> @@ -1846,6 +1847,16 @@
>> /* The offset by which QP is incremented for inter-frames when
>> bEnableSceneCutAwareQp is set.
>> * Default is +5. */
>> int maxQpDelta;
>> +
>> + /* A genuine threshold used for histogram based scene cut detection.
>> + * This threshold determines whether a frame is a scenecut or not
>> + * when compared against the edge and chroma histogram sad values.
>> + * Default 0.01. Range: Real number in the interval (0,2). */
>> + double edgeTransitionThreshold;
>> +
>> + /* Enables histogram based scenecut detection algorithm to detect
>> scenecuts. */
>> + bool bHistBasedSceneCut;
>> +
>>
> Indentation issue
>
>> } x265_param;
>> /* x265_param_alloc:
>> * Allocates an x265_param instance. The returned param structure is not
>> diff -r 04db2bfee5d6 -r 40beab295ca2 source/x265cli.h
>> --- a/source/x265cli.h Thu Oct 31 16:23:27 2019 +0530
>> +++ b/source/x265cli.h Wed Nov 13 18:18:31 2019 +0530
>> @@ -129,6 +129,9 @@
>> { "scenecut", required_argument, NULL, 0 },
>> { "no-scenecut", no_argument, NULL, 0 },
>> { "scenecut-bias", required_argument, NULL, 0 },
>> + { "hist-scenecut", no_argument, NULL, 0},
>> + { "no-hist-scenecut", no_argument, NULL, 0},
>> + { "hist-threshold", required_argument, NULL, 0},
>> { "fades", no_argument, NULL, 0 },
>> { "no-fades", no_argument, NULL, 0 },
>> { "scenecut-aware-qp", no_argument, NULL, 0 },
>> @@ -489,7 +492,10 @@
>> H0(" --gop-lookahead <integer> Extends gop boundary if a
>> scenecut is found within this from keyint boundary. Default 0\n");
>> H0(" --no-scenecut Disable adaptive I-frame
>> decision\n");
>> H0(" --scenecut <integer> How aggressively to insert
>> extra I-frames. Default %d\n", param->scenecutThreshold);
>> - H1(" --scenecut-bias <0..100.0> Bias for scenecut detection.
>> Default %.2f\n", param->scenecutBias);
>> + H1(" --scenecut-bias <0..100.0> Bias for scenecut detection.
>> Default %.2f\n", param->scenecutBias);
>> + H0(" --hist-scenecut Enables histogram based
>> scene-cut detection using histogram based algorithm.\n");
>> + H0(" --no-hist-scenecut Disables histogram based
>> scene-cut detection using histogram based algorithm.\n");
>> + H1(" --hist-threshold <0.0..2.0> Luma Edge histogram's
>> Normalized SAD threshold for histogram based scenecut detection Default
>> %.2f\n", param->edgeTransitionThreshold);
>> H0(" --[no-]fades Enable detection and handling
>> of fade-in regions. Default %s\n", OPT(param->bEnableFades));
>> H1(" --[no-]scenecut-aware-qp Enable increasing QP for frames
>> inside the scenecut window after scenecut. Default %s\n",
>> OPT(param->bEnableSceneCutAwareQp));
>> H1(" --scenecut-window <0..1000> QP incremental duration(in
>> milliseconds) when scenecut-aware-qp is enabled. Default %d\n",
>> param->scenecutWindow);
>>
>> --
>> *With Regards,*
>> *Srikanth Kurapati.*
>> _______________________________________________
>> x265-devel mailing list
>> x265-devel at videolan.org
>> https://mailman.videolan.org/listinfo/x265-devel
>>
>
>
> --
> Regards,
> *Aruna Matheswaran,*
> Video Codec Engineer,
> Media & AI analytics BU,
>
>
>
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
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--
*With Regards,*
*Srikanth Kurapati.*
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