How to access the File until it is closed by Yandex Speech?

Question

go

Good afternoon, I ran into a problem
I'm testing Yandex speech and there is such a problem that I can only get data when a third-party application closes the file
In this regard, I can get data only when the code closes the file
https://play.golang.org/p/Vxn-gocNlY2
Errors
[[email protected]_master go]# go run yandex.go
File not yet closed by third party application
/usr/local/freeswitch/recordings/79095876084.wav
/usr/local/freeswitch/recordings/79095876084.wav
recvProtoMessage / proto.Unmarshal proto: can't skip unknown wire type 6 for VoiceProxyProtobuf.Result
14 proto: can't skip unknown wire type 6 for VoiceProxyProtobuf.Result
File closed by third party application
/usr/local/freeswitch/recordings/79095876084.wav
/usr/local/freeswitch/recordings/79095876084.wav
got result movie movie.
Question ! How to work around this problem .Access the file on demand .