refactor: move from io/ioutil to io and os package (#1772)

The io/ioutil package has been deprecated as of Go 1.16, see
https://golang.org/doc/go1.16#ioutil. This commit replaces the existing
io/ioutil functions with their new definitions in io and os packages.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/ffmpeg/encoder.go

@@ -2,7 +2,7 @@ package ffmpeg
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"os"
 	"os/exec"
 	"strings"
@@ -126,7 +126,7 @@ func (e *Encoder) runTranscode(probeResult VideoFile, args []string) (string, er
 		}
 	}
 
-	stdoutData, _ := ioutil.ReadAll(stdout)
+	stdoutData, _ := io.ReadAll(stdout)
 	stdoutString := string(stdoutData)
 
 	registerRunningEncoder(probeResult.Path, cmd.Process)

pkg/ffmpeg/stream.go

@@ -2,7 +2,6 @@ package ffmpeg
 
 import (
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"os/exec"
@@ -234,7 +233,7 @@ func (e *Encoder) stream(probeResult VideoFile, options TranscodeStreamOptions)
 
 	// stderr must be consumed or the process deadlocks
 	go func() {
-		stderrData, _ := ioutil.ReadAll(stderr)
+		stderrData, _ := io.ReadAll(stderr)
 		stderrString := string(stderrData)
 		if len(stderrString) > 0 {
 			logger.Debugf("[stream] ffmpeg stderr: %s", stderrString)