diff --git a/pkg/avc/avc.go b/pkg/avc/avc.go
index 268689b..8e687fe 100644
--- a/pkg/avc/avc.go
+++ b/pkg/avc/avc.go
@@ -89,6 +89,8 @@ type Context struct {
 	Level   uint8
 	Width   uint32
 	Height  uint32
+
+	Sps Sps
 }
 
 // DecoderConfigurationRecord
diff --git a/pkg/avc/beta.go b/pkg/avc/beta.go
index a0f5b37..279b8ad 100644
--- a/pkg/avc/beta.go
+++ b/pkg/avc/beta.go
@@ -42,6 +42,8 @@ func ParseSps(payload []byte, ctx *Context) error {
 
 	ctx.Width = (sps.PicWidthInMbsMinusOne+1)*16 - (sps.FrameCropLeftOffset+sps.FrameCropRightOffset)*2
 	ctx.Height = (2-uint32(sps.FrameMbsOnlyFlag))*(sps.PicHeightInMapUnitsMinusOne+1)*16 - (sps.FrameCropTopOffset+sps.FrameCropBottomOffset)*2
+
+	ctx.Sps = sps
 	return nil
 }