From b647a774cd2ef75540e5a1d0254da45823a79488 Mon Sep 17 00:00:00 2001
From: Alex Eidt <alex.eidt@outlook.com>
Date: Mon, 27 Dec 2021 19:37:42 -0800
Subject: [PATCH] Added ffmpeg check in VideoWriter

---
 camera.go      | 1 +
 utils.go       | 4 ++--
 videowriter.go | 3 +++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/camera.go b/camera.go
index 1dc4cf5..34b660f 100644
--- a/camera.go
+++ b/camera.go
@@ -63,6 +63,7 @@ func getCameraData(device string, camera *Camera) {
 		"-i", device,
 	)
 
+	camera.cmd = cmd
 	pipe, err := cmd.StderrPipe()
 	if err != nil {
 		panic(err)
diff --git a/utils.go b/utils.go
index a4b7440..64149c9 100644
--- a/utils.go
+++ b/utils.go
@@ -91,13 +91,13 @@ func parseDevices(buffer []byte) []string {
 	devices := make([]string, 0)
 	bufferstr := string(buffer)
 
-	index := strings.Index(bufferstr, "DirectShow video devices")
+	index := strings.Index(bufferstr, "DirectShow video device")
 	if index == -1 {
 		return devices
 	}
 	bufferstr = bufferstr[index:]
 
-	index = strings.Index(bufferstr, "DirectShow audio devices")
+	index = strings.Index(bufferstr, "DirectShow audio device")
 	if index != -1 {
 		bufferstr = bufferstr[:index]
 	}
diff --git a/videowriter.go b/videowriter.go
index f28e1d2..9a53aee 100644
--- a/videowriter.go
+++ b/videowriter.go
@@ -36,6 +36,9 @@ type Options struct {
 }
 
 func NewVideoWriter(filename string, width, height int, options *Options) *VideoWriter {
+	// Check if ffmpeg is installed on the users machine.
+	checkExists("ffmpeg")
+
 	writer := VideoWriter{filename: filename}
 
 	writer.width = width