diff --git a/public/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/VariantsToPed.java b/public/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/VariantsToPed.java
index aab230b69..d8b01e91d 100644
--- a/public/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/VariantsToPed.java
+++ b/public/java/src/org/broadinstitute/sting/gatk/walkers/variantutils/VariantsToPed.java
@@ -7,6 +7,7 @@ import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
 import org.broadinstitute.sting.gatk.contexts.ReferenceContext;
 import org.broadinstitute.sting.gatk.refdata.RefMetaDataTracker;
 import org.broadinstitute.sting.gatk.walkers.RodWalker;
+import org.broadinstitute.sting.utils.codecs.vcf.VCFConstants;
 import org.broadinstitute.sting.utils.codecs.vcf.VCFHeader;
 import org.broadinstitute.sting.utils.codecs.vcf.VCFUtils;
 import org.broadinstitute.sting.utils.exceptions.ReviewedStingException;
@@ -45,6 +46,9 @@ public class VariantsToPed extends RodWalker<Integer,Integer> {
     @Output(shortName="fam",fullName="fam",required=true,doc="output fam file")
     PrintStream outFam;
 
+    @Argument(shortName="mgq",fullName="minGenotypeQuality",required=true,doc="If genotype quality is lower than this value, output NO_CALL")
+    int minGenotypeQuality = 0;
+
     private ValidateVariants vv = new ValidateVariants();
 
     private static double APPROX_CM_PER_BP = 1000000.0/750000.0;
@@ -173,9 +177,11 @@ public class VariantsToPed extends RodWalker<Integer,Integer> {
         return 0;
     }
 
-    private static byte getEncoding(Genotype g, int offset) {
+    private byte getEncoding(Genotype g, int offset) {
         byte b;
-        if ( g.isHomRef() ) {
+        if ( g.hasAttribute(VCFConstants.GENOTYPE_QUALITY_KEY) && ((Integer) g.getAttribute(VCFConstants.GENOTYPE_QUALITY_KEY)) < minGenotypeQuality ) {
+            b = NO_CALL;
+        } else if ( g.isHomRef() ) {
             b = HOM_REF;
         } else if ( g.isHomVar() ) {
             b = HOM_VAR;
diff --git a/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/ChunkVCF.scala b/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/ChunkVCF.scala
index 257fef021..0184b5d2c 100644
--- a/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/ChunkVCF.scala
+++ b/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/ChunkVCF.scala
@@ -23,7 +23,7 @@ class ChunkVCF extends QScript {
   @Input(shortName="N",fullName="numEntriesInChunk",doc="The number of variants per chunk",required=true)
   var numEntries : Int = _
 
-  @Input(shortName="I",fullName="Intervals",doc="The SNP interval list to chunk. If not provided, one will be created for you to provide in a second run.")
+  @Input(shortName="I",fullName="Intervals",doc="The SNP interval list to chunk. If not provided, one will be created for you to provide in a second run.",required=false)
   var intervals : File = _
 
   @Input(fullName="preserveChromosomes",doc="Restrict chunks to one chromosome (smaller chunk at end of chromosome)",required=false)
@@ -40,8 +40,8 @@ class ChunkVCF extends QScript {
   def script = {
     if ( intervals == null ) {
       // create an interval list from the VCF
-      val ivals : File = swapExt(variants,".vcf",".intervals.list")
-      val extract : VCFExtractIntervals = new VCFExtractIntervals(variants,ivals,false)
+      val ivals : File = swapExt(inVCF,".vcf",".intervals.list")
+      val extract : VCFExtractIntervals = new VCFExtractIntervals(inVCF,ivals,false)
       add(extract)
     } else {
       var chunkNum = 1
@@ -54,11 +54,12 @@ class ChunkVCF extends QScript {
         if ( ( preserve && ! int.split(":")(0).equals(chromosome) ) || numLinesInChunk > numEntries ) {
           chunkWriter.close()
           val chunkSelect : SelectVariants = new SelectVariants
+          chunkSelect.variant = inVCF
           chunkSelect.reference_sequence = ref
           chunkSelect.memoryLimit = 2
           chunkSelect.intervals :+= chunkFile
           if ( extractSamples != null )
-            chunkSelect.sample_file = extractSamples
+            chunkSelect.sample_file :+= extractSamples
           chunkSelect.out = swapExt(inVCF,".vcf",".chunk%d.vcf".format(chunkNum))
           add(chunkSelect)
           chunkNum += 1
@@ -74,12 +75,13 @@ class ChunkVCF extends QScript {
       if ( numLinesInChunk > 0 ) {
         // some work to do
         val chunkSelect : SelectVariants = new SelectVariants
+        chunkSelect.variant = inVCF
         chunkSelect.reference_sequence = ref
         chunkSelect.memoryLimit = 2
         chunkSelect.intervals :+= chunkFile
         chunkWriter.close()
         if ( extractSamples != null )
-          chunkSelect.sample_file = extractSamples
+          chunkSelect.sample_file :+= extractSamples
         chunkSelect.out = swapExt(inVCF,".vcf",".chunk%d.vcf".format(chunkNum))
         add(chunkSelect)
       }
diff --git a/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/VcfToPed.scala b/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/VcfToPed.scala
index 913a62e26..cad8af51d 100644
--- a/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/VcfToPed.scala
+++ b/public/scala/qscript/org/broadinstitute/sting/queue/qscripts/lib/VcfToPed.scala
@@ -47,9 +47,14 @@ class VcfToPed extends QScript {
       val extract : VCFExtractIntervals = new VCFExtractIntervals(variants,ivals,false)
       add(extract)
     } else {
+      val IS_GZ : Boolean = variants.getName.endsWith(".vcf.gz")
       var iXRL = new XReadLines(intervals)
       var chunk = 1;
-      var subListFile = swapExt(tmpdir,variants,".vcf",".chunk%d.list".format(chunk))
+      var subListFile : File = null
+      if ( IS_GZ )
+        subListFile = swapExt(tmpdir,variants,".vcf.gz",".chunk%d.list".format(chunk))
+      else
+        subListFile = swapExt(tmpdir,variants,".vcf",".chunk%d.list".format(chunk))
       var subList = new PrintStream(subListFile)
       var nL = 0;
       var bedOuts : List[File] = Nil;
@@ -58,7 +63,7 @@ class VcfToPed extends QScript {
       while ( iXRL.hasNext ) {
         subList.printf("%s%n",iXRL.next())
         nL = nL + 1
-        if ( nL > 100000 ) {
+        if ( nL > 10000 ) {
           val toPed : VariantsToPed = new VariantsToPed
           toPed.memoryLimit = 2
           toPed.reference_sequence = ref
@@ -89,7 +94,10 @@ class VcfToPed extends QScript {
           add(toPed)
           subList.close()
           chunk = chunk + 1
-          subListFile = swapExt(tmpdir,variants,".vcf",".chunk%d.list".format(chunk))
+          if ( IS_GZ  )
+            subListFile = swapExt(tmpdir,variants,".vcf.gz",".chunk%d.list".format(chunk))
+          else
+            subListFile = swapExt(tmpdir,variants,".vcf",".chunk%d.list".format(chunk))
           subList = new PrintStream(subListFile)
           bedOuts :+= tBed
           bimOuts :+= bim