diff --git a/schema/output.go b/schema/output.go
index 2715d50..58ee448 100644
--- a/schema/output.go
+++ b/schema/output.go
@@ -251,15 +251,17 @@ func outputSchema(schemaPath string) (*jsonschema.Schema, error) {
 }
 
 func validateSemantics(transcript Transcript) error {
+	segments := make([]segmentSemantics, len(transcript.Segments))
 	for index, segment := range transcript.Segments {
-		wantID := index + 1
-		if segment.ID != wantID {
-			return fmt.Errorf("segment %d has id %d; want %d", index, segment.ID, wantID)
-		}
-		if segment.End < segment.Start {
-			return fmt.Errorf("segment %d has end %.3f before start %.3f", index, segment.End, segment.Start)
+		segments[index] = segmentSemantics{
+			id:    segment.ID,
+			start: segment.Start,
+			end:   segment.End,
 		}
 	}
+	if err := validateSegmentSemantics(segments); err != nil {
+		return err
+	}
 	for index, group := range transcript.OverlapGroups {
 		if group.End < group.Start {
 			return fmt.Errorf("overlap_group %d has end %.3f before start %.3f", index, group.End, group.Start)
@@ -269,26 +271,43 @@ func validateSemantics(transcript Transcript) error {
 }
 
 func validateIntermediateSemantics(transcript IntermediateTranscript) error {
+	segments := make([]segmentSemantics, len(transcript.Segments))
 	for index, segment := range transcript.Segments {
-		wantID := index + 1
-		if segment.ID != wantID {
-			return fmt.Errorf("segment %d has id %d; want %d", index, segment.ID, wantID)
-		}
-		if segment.End < segment.Start {
-			return fmt.Errorf("segment %d has end %.3f before start %.3f", index, segment.End, segment.Start)
+		segments[index] = segmentSemantics{
+			id:    segment.ID,
+			start: segment.Start,
+			end:   segment.End,
 		}
 	}
-	return nil
+	return validateSegmentSemantics(segments)
 }
 
 func validateMinimalSemantics(transcript MinimalTranscript) error {
+	segments := make([]segmentSemantics, len(transcript.Segments))
 	for index, segment := range transcript.Segments {
-		wantID := index + 1
-		if segment.ID != wantID {
-			return fmt.Errorf("segment %d has id %d; want %d", index, segment.ID, wantID)
+		segments[index] = segmentSemantics{
+			id:    segment.ID,
+			start: segment.Start,
+			end:   segment.End,
 		}
-		if segment.End < segment.Start {
-			return fmt.Errorf("segment %d has end %.3f before start %.3f", index, segment.End, segment.Start)
+	}
+	return validateSegmentSemantics(segments)
+}
+
+type segmentSemantics struct {
+	id    int
+	start float64
+	end   float64
+}
+
+func validateSegmentSemantics(segments []segmentSemantics) error {
+	for index, segment := range segments {
+		wantID := index + 1
+		if segment.id != wantID {
+			return fmt.Errorf("segment %d has id %d; want %d", index, segment.id, wantID)
+		}
+		if segment.end < segment.start {
+			return fmt.Errorf("segment %d has end %.3f before start %.3f", index, segment.end, segment.start)
 		}
 	}
 	return nil