Don't use CFR mode if forced framerate is same as the source file

Author: myrsloik

src/avisynth/avssources.cpp

@@ -114,11 +114,11 @@ static AVPixelFormat CSNameToPIXFMT(const char *CSName, AVPixelFormat Default, b
 }
 
 AvisynthVideoSource::AvisynthVideoSource(const char *SourceFile, int Track, FFMS_Index *Index,
-    int FPSNum, int FPSDen, int Threads, int SeekMode, int RFFMode,
+    int AFPSNum, int AFPSDen, int Threads, int SeekMode, int RFFMode,
     int ResizeToWidth, int ResizeToHeight, const char *ResizerName,
     const char *ConvertToFormatName, const char *VarPrefix, IScriptEnvironment* Env)
-    : FPSNum(FPSNum)
-    , FPSDen(FPSDen)
+    : FPSNum(AFPSNum)
+    , FPSDen(AFPSDen)
     , RFFMode(RFFMode)
     , VarPrefix(VarPrefix) {
     VI = {};
@@ -227,19 +227,25 @@ AvisynthVideoSource::AvisynthVideoSource(const char *SourceFile, int Track, FFMS
             FieldList.resize(VI.num_frames);
         }
     } else {
+        VI.fps_denominator = VP->FPSDenominator;
+        VI.fps_numerator = VP->FPSNumerator;
+        VI.num_frames = VP->NumFrames;
         if (FPSNum > 0 && FPSDen > 0) {
-            VI.fps_denominator = FPSDen;
-            VI.fps_numerator = FPSNum;
-            if (VP->NumFrames > 1) {
-                VI.num_frames = static_cast<int>((VP->LastTime - VP->FirstTime) * (1 + 1. / (VP->NumFrames - 1)) * FPSNum / FPSDen + 0.5);
-                if (VI.num_frames < 1) VI.num_frames = 1;
+            vsh::reduceRational(&FPSNum, &FPSDen);
+            if (VI.fps_denominator != FPSDen || VI.fps_numerator != FPSNum) {
+                VI.fps_denominator = FPSDen;
+                VI.fps_numerator = FPSNum;
+                if (VP->NumFrames > 1) {
+                    VI.num_frames = static_cast<int>((VP->LastTime - VP->FirstTime) * (1 + 1. / (VP->NumFrames - 1)) * FPSNum / FPSDen + 0.5);
+                    if (VI.num_frames < 1)
+                        VI.num_frames = 1;
+                } else {
+                    VI.num_frames = 1;
+                }
             } else {
-                VI.num_frames = 1;
+                FPSNum = 0;
+                FPSDen = 0;
             }
-        } else {
-            VI.fps_denominator = VP->FPSDenominator;
-            VI.fps_numerator = VP->FPSNumerator;
-            VI.num_frames = VP->NumFrames;
         }
     }
 
@@ -584,7 +590,7 @@ PVideoFrame AvisynthVideoSource::GetFrame(int n, IScriptEnvironment *Env) {
                     num = 1;
                 int64_t DurNum = TB->Num * num;
                 int64_t DurDen = TB->Den * 1000;
-                vsh::muldivRational(&DurNum, &DurDen, 1, 1);
+                vsh::reduceRational(&DurNum, &DurDen);
                 Env->propSetInt(props, "_DurationNum", DurNum, 0);
                 Env->propSetInt(props, "_DurationDen", DurDen, 0);
                 Env->propSetFloat(props, "_AbsoluteTime", ((static_cast<double>(TB->Num) / 1000) * FFMS_GetFrameInfo(T, n)->PTS) / TB->Den, 0);

src/avisynth/avssources.h

@@ -45,8 +45,8 @@ class AvisynthVideoSource : public IClip {
     VideoInfo VI;
     bool HighBitDepth;
     FFMS_VideoSource *V;
-    int FPSNum;
-    int FPSDen;
+    int64_t FPSNum;
+    int64_t FPSDen;
     int RFFMode;
     std::vector<FrameFields> FieldList;
     const char *VarPrefix;

src/vapoursynth/vapoursource4.cpp

@@ -141,7 +141,7 @@ const VSFrame *VS_CC VSVideoSource4::GetVSFrame(int n, VSCore *core, const VSAPI
             num = 1;
         int64_t DurNum = TB->Num * num;
         int64_t DurDen = TB->Den * 1000;
-        vsh::muldivRational(&DurNum, &DurDen, 1, 1);
+        vsh::reduceRational(&DurNum, &DurDen);
         vsapi->mapSetInt(Props, "_DurationNum", DurNum, maReplace);
         vsapi->mapSetInt(Props, "_DurationDen", DurDen, maReplace);
         vsapi->mapSetFloat(Props, "_AbsoluteTime", ((static_cast<double>(TB->Num) / 1000) * FFMS_GetFrameInfo(T, n)->PTS) / TB->Den, maReplace);
@@ -274,22 +274,27 @@ VSVideoSource4::VSVideoSource4(const char *SourceFile, int Track, FFMS_Index *In
 
     const FFMS_VideoProperties *VP = FFMS_GetVideoProperties(V);
 
+    VI[0].fpsDen = VP->FPSDenominator;
+    VI[0].fpsNum = VP->FPSNumerator;
+    VI[0].numFrames = VP->NumFrames;
+    vsh::reduceRational(&VI[0].fpsNum, &VI[0].fpsDen);
+
     if (FPSNum > 0 && FPSDen > 0) {
-        vsh::muldivRational(&FPSNum, &FPSDen, 1, 1);
-        VI[0].fpsDen = FPSDen;
-        VI[0].fpsNum = FPSNum;
-        if (VP->NumFrames > 1) {
-            VI[0].numFrames = static_cast<int>((VP->LastTime - VP->FirstTime) * (1 + 1. / (VP->NumFrames - 1)) * FPSNum / FPSDen + 0.5);
-            if (VI[0].numFrames < 1)
+        vsh::reduceRational(&FPSNum, &FPSDen);
+        if (VI[0].fpsDen != FPSDen || VI[0].fpsNum != FPSNum) {
+            VI[0].fpsDen = FPSDen;
+            VI[0].fpsNum = FPSNum;
+            if (VP->NumFrames > 1) {
+                VI[0].numFrames = static_cast<int>((VP->LastTime - VP->FirstTime) * (1 + 1. / (VP->NumFrames - 1)) * FPSNum / FPSDen + 0.5);
+                if (VI[0].numFrames < 1)
+                    VI[0].numFrames = 1;
+            } else {
                 VI[0].numFrames = 1;
+            }
         } else {
-            VI[0].numFrames = 1;
+            FPSNum = 0;
+            FPSDen = 0;
         }
-    } else {
-        VI[0].fpsDen = VP->FPSDenominator;
-        VI[0].fpsNum = VP->FPSNumerator;
-        VI[0].numFrames = VP->NumFrames;
-        vsh::muldivRational(&VI[0].fpsNum, &VI[0].fpsDen, 1, 1);
     }
 
     if (OutputAlpha) {