fix(ffmpeg): 0s frame handling

* handle 0 duration

* test: update golden files

ffmpeg/ffmpeg.go

@@ -110,8 +110,10 @@ func (av *AVContext) SelectDuration(ts time.Duration) (err error) {
 		if err = av.SeekDuration(ts); err != nil {
 			return
 		}
+		return av.ProcessFrames(-1)
+	} else {
+		return av.ProcessFrames(1)
 	}
-	return av.ProcessFrames(-1)
 }
 
 func (av *AVContext) SeekPosition(f float64) error {

ffmpeg/ffmpeg_test.go

@@ -55,7 +55,7 @@ func TestAVContext(t *testing.T) {
 	require.NoError(t, os.MkdirAll(baseDir+"golden/export", 0755))
 	t.Parallel()
 	for _, filename := range files {
-		for _, n := range []int{-1, 5, 10, 9999, 99999} {
+		for _, n := range []int{-1, 1, 5, 10, 9999, 99999} {
 			name := filename
 			if n > -1 {
 				name = fmt.Sprintf("%s-%d", filename, n)
@@ -84,6 +84,8 @@ func TestAVContext(t *testing.T) {
 					require.NoError(t, av.SelectDuration(time.Second))
 				} else if n == 9999 {
 					require.NoError(t, av.SelectPosition(0.7))
+				} else if n == 1 {
+					require.NoError(t, av.SelectDuration(0))
 				} else if n == 5 {
 					require.NoError(t, av.SelectFrame(n))
 				} else {

testdata/golden/meta/alpha-webm.webm-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":12040,"width":720,"height":576,"fps":25,"has_video":true,"has_audio":false}

testdata/golden/meta/everybody-betray-me.mkv-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":7407,"width":640,"height":480,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/macabre.mp4-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":3925,"width":492,"height":360,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/schizo.flv-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":2560,"width":480,"height":360,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/schizo_0.mp4-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":2544,"width":480,"height":360,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/schizo_180.mp4-1.meta.json

@@ -0,0 +1 @@
+{"orientation":3,"duration":2544,"width":480,"height":360,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/schizo_270.mp4-1.meta.json

@@ -0,0 +1 @@
+{"orientation":6,"duration":2544,"width":360,"height":480,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/schizo_90.mp4-1.meta.json

@@ -0,0 +1 @@
+{"orientation":8,"duration":2544,"width":360,"height":480,"fps":29.97002997002997,"has_video":true,"has_audio":true}

testdata/golden/meta/with_cover.mp3-1.meta.json

@@ -0,0 +1 @@
+{"orientation":1,"duration":1906,"width":1280,"height":720,"fps":90000,"has_video":true,"has_audio":true}