I can not download mp3 file by ffmpeg

[masayoshi]

I can not download bbc.mp3.
Could you tell me how to modify my code?

package main

import
(
	"fmt"
	"os/exec"
)

func main () {

cmd := exec.Command("ffmpeg","-i http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_world_service/bbc_world_service.isml/bbc_world_service-audio%3d48000.norewind.m3u8 -t 300 -b:a 64k bbc.mp3")

err := cmd.Run()
if err != nil {
   fmt.Println(err)
   }
}

[Yamil_Bracho]

The solution is to use the Stderr property of the Command object.
I’ll be something like

package main

import (
    "bytes"
    "fmt"
    "os/exec"
)
func main() {
    cmd := exec.Command("ffmpeg", "-i http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_world_service/bbc_world_service.isml/bbc_world_service-audio%3d48000.norewind.m3u8 -t 300 -b:a 64k bbc.mp3")
    var out bytes.Buffer
    var stderr bytes.Buffer
    cmd.Stdout = &out
    cmd.Stderr = &stderr
    if err := cmd.Run(); err != nil {
        fmt.Println(fmt.Sprint(err) + ": " + stderr.String())
        return
    }
}