flv: fixed NewEncoder so that we still create encoder even if the HeaderByte write fails

rtmp/rtmp_test.go

@@ -185,7 +185,7 @@ func TestFromFrame(t *testing.T) {
 
 	const frameRate = 25
 	flvEncoder, err := flv.NewEncoder(s, true, true, frameRate)
-	if err != nil {
+	if err != nil && err != errTinyPacket {
 		t.Errorf("Failed to create flv encoder with error: %v", err)
 	}
 	err = lex.H264(flvEncoder, bytes.NewReader(videoData), time.Second/time.Duration(frameRate))

stream/flv/encoder.go

@@ -73,9 +73,6 @@ func NewEncoder(dst io.Writer, audio, video bool, fps int) (*Encoder, error) {
 		video: video,
 	}
 	_, err := dst.Write(e.HeaderBytes())
-	if err != nil {
-		return nil, err
-	}
 	return &e, err
 }