Can't execute ffprobe command - go

Question

I try to get video file duration with ffprobe. When I run this code I get error:
exit status 1:
var out bytes.Buffer
var stderr bytes.Buffer
cmdArgs := []string{"-i", "bunny.mp4", "-show_entries", "format=duration", "-v", "quiet", "-of", `csv="p=0"`}
cmd := exec.Command("ffprobe", cmdArguments...)
cmd.Stdout = &out
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
fmt.Println(fmt.Sprint(err) + ": " + stderr.String())
}
fmt.Printf("command output: %q\n", out.String())
But when I pass argruments without -of csv="p=0" like this:
cmdArgs := []string{"-i", "bunny.mp4", "-show_entries", "format=duration", "-v", "quiet"}
It works and returns the result (but in bad format):
command output: "[FORMAT]\nduration=3.008000\n[/FORMAT]\n"
So what is the problem and how to solve it ?

Answer 1

Try formatting the argument like this (use double quotes for the string instead of backticks and remove the inner double quotes):
cmdArgs := []string{..., "csv=p=0"}
The Go exec package does not invoke the sytem shell to process the arguments, so you do not need to take the same precautions when specifying them. In this case, there's no need to wrap the portion after the first "=" in quotes.
From the package documentation:
Unlike the "system" library call from C and other languages, the
os/exec package intentionally does not invoke the system shell and
does not expand any glob patterns or handle other expansions,
pipelines, or redirections typically done by shells. The package
behaves more like C's "exec" family of functions. To expand glob
patterns, either call the shell directly, taking care to escape any
dangerous input, or use the path/filepath package's Glob function. To
expand environment variables, use package os's ExpandEnv.