Added a basic transcoder test

core/ffmpeg/transcoder.go

@@ -24,6 +24,7 @@ type Transcoder struct {
 	hlsPlaylistLength    int
 	segmentLengthSeconds int
 	appendToStream       bool
+	ffmpegPath           string
 }
 
 // HLSVariant is a combination of settings that results in a single HLS stream
@@ -104,7 +105,7 @@ func (t *Transcoder) getString() string {
 
 	ffmpegFlags := []string{
 		"cat", t.input, "|",
-		config.Config.GetFFMpegPath(),
+		t.ffmpegPath,
 		"-hide_banner",
 		"-i pipe:",
 		t.getVariantsString(),
@@ -112,7 +113,7 @@ func (t *Transcoder) getString() string {
 		// HLS Output
 		"-f", "hls",
 		"-hls_time", strconv.Itoa(t.segmentLengthSeconds), // Length of each segment
-		"-hls_list_size", strconv.Itoa(config.Config.GetMaxNumberOfReferencedSegmentsInPlaylist()), // Max # in variant playlist
+		"-hls_list_size", strconv.Itoa(t.hlsPlaylistLength), // Max # in variant playlist
 		"-hls_delete_threshold", "10", // Start deleting files after hls_list_size + 10
 		"-hls_flags", strings.Join(hlsOptionFlags, "+"), // Specific options in HLS generation
 
@@ -175,6 +176,8 @@ func getVariantFromConfigQuality(quality config.StreamQuality, index int) HLSVar
 // NewTranscoder will return a new Transcoder, populated by the config
 func NewTranscoder() Transcoder {
 	transcoder := new(Transcoder)
+	transcoder.ffmpegPath = config.Config.GetFFMpegPath()
+	transcoder.hlsPlaylistLength = config.Config.GetMaxNumberOfReferencedSegmentsInPlaylist()
 
 	var outputPath string
 	if config.Config.S3.Enabled || config.Config.IPFS.Enabled {

core/ffmpeg/transcoder_test.go

@@ -0,0 +1,30 @@
+package ffmpeg
+
+import (
+	"testing"
+)
+
+func TestFFmpegCommand(t *testing.T) {
+	transcoder := new(Transcoder)
+	transcoder.ffmpegPath = "/fake/path/ffmpeg"
+	transcoder.SetSegmentLength(4)
+	transcoder.SetInput("fakecontent.flv")
+	transcoder.SetOutputPath("fakeOutput")
+	transcoder.SetHLSPlaylistLength(10)
+
+	variant := HLSVariant{}
+	variant.videoBitrate = "1200k"
+	variant.isAudioPassthrough = true
+	variant.encoderPreset = "veryfast"
+	variant.SetVideoFramerate(30)
+
+	transcoder.AddVariant(variant)
+
+	cmd := transcoder.getString()
+
+	expected := "cat fakecontent.flv | /fake/path/ffmpeg -hide_banner -i pipe:  -map v:0 -c:v:0 libx264 -b:v:0 1200k -map a:0 -c:a:0 copy -r 30 -g 60 -keyint_min 60 -preset veryfast  -var_stream_map \"v:0,a:0 \" -f hls -hls_time 4 -hls_list_size 10 -hls_delete_threshold 10 -hls_flags delete_segments+program_date_time+temp_file -tune zerolatency -sc_threshold 0 -master_pl_name stream.m3u8 -strftime 1 -hls_segment_filename fakeOutput/%v/stream-%s.ts -max_muxing_queue_size 400 fakeOutput/%v/stream.m3u8 2> transcoder.log"
+
+	if cmd != expected {
+		t.Errorf("ffmpeg command does not match expected.  Got %s, want: %s", cmd, expected)
+	}
+}