diff --git a/src/lib/image/MovieFFMpeg/MovieFFMpeg.cpp b/src/lib/image/MovieFFMpeg/MovieFFMpeg.cpp
index 45267f488..3239d99d7 100644
--- a/src/lib/image/MovieFFMpeg/MovieFFMpeg.cpp
+++ b/src/lib/image/MovieFFMpeg/MovieFFMpeg.cpp
@@ -52,7 +52,10 @@ extern "C" {
 //#include <libavcodec/ass_split.h>
 }
 
-static ENVVAR_BOOL( evUseUploadedMovieForStreaming, "RV_SHOTGRID_USE_UPLOADED_MOVIE_FOR_STREAMING", false );
+namespace {
+    ENVVAR_BOOL( evUseUploadedMovieForStreaming, "RV_SHOTGRID_USE_UPLOADED_MOVIE_FOR_STREAMING", false );
+    ENVVAR_BOOL(evStartFrameAtOne, "RV_START_FRAME_AT_ONE", false);
+}
 
 namespace TwkMovie {
 
@@ -1330,10 +1333,13 @@ MovieFFMpegReader::getFirstFrame(AVRational rate)
     // format start time, then we have to assume that the source's start is
     // offset by the given positive value.
     //
-
-    m_formatStartFrame = max(int64_t(0), int64_t(0.49 + av_q2d(rate) *
-        double(m_avFormatContext->start_time) / double(AV_TIME_BASE)));
-    int64_t firstFrame = max(int64_t(m_formatStartFrame), int64_t(1));
+    
+    int64_t firstFrame = std::max(static_cast<int64_t>(0), static_cast<int64_t>(0.49 + av_q2d(rate) *
+        static_cast<double>(m_avFormatContext->start_time) / static_cast<double>(AV_TIME_BASE)));
+    if (evStartFrameAtOne.getValue())
+    {
+        firstFrame = max(int64_t(m_formatStartFrame), int64_t(1));
+    }
 
     for (int i = 0; i < m_avFormatContext->nb_streams; i++)
     {
diff --git a/src/lib/ip/IPBaseNodes/StackIPNode.cpp b/src/lib/ip/IPBaseNodes/StackIPNode.cpp
index 293f813bb..965f37474 100644
--- a/src/lib/ip/IPBaseNodes/StackIPNode.cpp
+++ b/src/lib/ip/IPBaseNodes/StackIPNode.cpp
@@ -291,7 +291,7 @@ StackIPNode::computeRanges()
 
     m_info.cutIn  = m_info.start;
     m_info.cutOut = m_info.end;
-    m_offset      = m_info.start - 1;
+    m_offset      = std::max(m_info.start - 1, 0);
 
     if (m_outputFPS->front() == 0.0 && !m_rangeInfos.empty() && ! m_rangeInfos[0].isUndiscovered)
     {
diff --git a/src/lib/ip/IPCore/Session.cpp b/src/lib/ip/IPCore/Session.cpp
index 71b455bb0..1508370fd 100644
--- a/src/lib/ip/IPCore/Session.cpp
+++ b/src/lib/ip/IPCore/Session.cpp
@@ -312,14 +312,14 @@ Session::Session(IPGraph* graph)
       m_waitForUploadThreadPrefetch(false),
       m_readingGTO(false),
       m_sessionType(SequenceSession),
-      m_rangeStart(1),
-      m_rangeEnd(2),
+      m_rangeStart(0),
+      m_rangeEnd(1),
       m_outputVideoDevice(0),
       m_controlVideoDevice(0),
-      m_narrowedRangeStart(1),
-      m_narrowedRangeEnd(2),
-      m_inPoint(1),
-      m_outPoint(2),
+      m_narrowedRangeStart(0),
+      m_narrowedRangeEnd(1),
+      m_inPoint(0),
+      m_outPoint(1),
       m_notPersistent(0),
       m_inc(1),
       //m_loadingError(false),
@@ -336,7 +336,7 @@ Session::Session(IPGraph* graph)
       m_overhead(0),
       m_shift(0),
       m_skipped(0),
-      m_frame(1),
+      m_frame(0),
       m_fastStart(true),
       m_bufferWait(false),
       m_latencyWait(false),
@@ -1706,11 +1706,11 @@ Session::clear()
     graph().flushAudioCache();
     if (!m_beingDeleted) graph().reset(App()->videoModules());
     setFileName("Untitled");
-    setInPoint(1);
-    setOutPoint(2);
-    setRangeStart(1);
-    setRangeEnd(2);
-    setFrameInternal(1);
+    setInPoint(0);
+    setOutPoint(1);
+    setRangeStart(0);
+    setRangeEnd(1);
+    setFrameInternal(0);
 
     if (!m_beingDeleted)
     {