diff --git a/http/api/avstream.go b/http/api/avstream.go
index 5948d220..1b68faf4 100644
--- a/http/api/avstream.go
+++ b/http/api/avstream.go
@@ -51,13 +51,13 @@ type AVstream struct {
 	Codec     string `json:"codec"`
 	Profile   int    `json:"profile"`
 	Level     int    `json:"level"`
-	Pixfmt    string `json:"pix_fmt"`
-	Width     uint64 `json:"width" format:"uint64"`
-	Height    uint64 `json:"height" format:"uint64"`
-	Samplefmt string `json:"sample_fmt"`
-	Sampling  uint64 `json:"sampling_hz" format:"uint64"`
-	Layout    string `json:"layout"`
-	Channels  uint64 `json:"channels" format:"uint64"`
+	Pixfmt    string `json:"pix_fmt,omitempty"`
+	Width     uint64 `json:"width,omitempty" format:"uint64"`
+	Height    uint64 `json:"height,omitempty" format:"uint64"`
+	Samplefmt string `json:"sample_fmt,omitempty"`
+	Sampling  uint64 `json:"sampling_hz,omitempty" format:"uint64"`
+	Layout    string `json:"layout,omitempty"`
+	Channels  uint64 `json:"channels,omitempty" format:"uint64"`
 }
 
 func (a *AVstream) Unmarshal(av *app.AVstream) {