Golang with ffmpeg dynamic video Encode

Am trying to encode the videos with Golang ffmpeg. Am not able to get the video file, it shows this error

>invalid character '-' in numeric literal

Postman:

This is my code:

package main
import (
"encoding/json"
"fmt"
"net/http"
"github.com/gorilla/mux"
"github.com/xfrr/goffmpeg/transcoder"
)
type Encode struct {
Video string `json:"video"`
}
func encodeFfmpeg(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
fmt.Println("Encodeing Started")
var encode Encode
video := json.NewDecoder(r.Body).Decode(encode)
file, err := os.Open(video)
if err != nil {
log.Fatalln(err)
}
defer file.Close()
buf, err := ioutil.ReadAll(file)
if err != nil {
log.Fatalln(err)
}
cmd := exec.Command("ffmpeg",
"-i", "pipe:0", // take stdin as input
"-c:a", "libmp3lame", // use mp3 lame codec
"-f", "avi",
"pipe:1",
)
resultBuffer := bytes.NewBuffer(make([]byte, 5*1024*1024)) // pre allocate 5MiB buffer
cmd.Stderr = os.Stderr    // bind log stream to stderr
cmd.Stdout = resultBuffer // stdout result will be written here
stdin, err := cmd.StdinPipe() // Open stdin pipe
if err != nil {
log.Fatalln(err)
}
err = cmd.Start() // Start a process on another goroutine
if err != nil {
log.Fatalln(err)
}
_, err = stdin.Write(buf) // pump audio data to stdin pipe
if err != nil {
log.Fatalln(err)
}
err = stdin.Close() // close the stdin, or ffmpeg will wait forever
if err != nil {
log.Fatalln(err)
}
err = cmd.Wait() // wait until ffmpeg finish
if err != nil {
log.Fatalln(err)
}
outputFile, err := os.Create(encodeFile) // create new file
if err != nil {
log.Fatalln(err)
}
defer outputFile.Close()
_, err = outputFile.Write(resultBuffer.Bytes()) // write result buffer to file
if err != nil {
log.Fatalln(err)
}
json.NewEncoder(w).Encode(map[string]interface{}{
"status":     "success",
"statusCode": 200,
"data":       "Successfully Encoded file",
})
}
func main() {
router := mux.NewRouter()
router.HandleFunc("/encode", encodeFfmpeg).Methods("POST")
//router.HandleFunc("/rtsp", rtsp).Methods("POST")
// config port
fmt.Printf("Starting server at 8080 \n")
http.ListenAndServe(":8080", router)
}

video.mp4 file not showing in request body. Please help me to solve this issue

json.NewDecoder(r.Body).Decode(encode) returns error not video and another thing is that you send your data in form so you can access file from form like:

file, header, err := r.FormFile("video")