diff --git a/http/api/progress.go b/http/api/progress.go
index 93671b57..dc1bdd5b 100644
--- a/http/api/progress.go
+++ b/http/api/progress.go
@@ -40,9 +40,10 @@ type ProgressIO struct {
 	Height    uint64      `json:"height,omitempty" format:"uint64"`
 
 	// Audio
-	Sampling uint64 `json:"sampling_hz,omitempty" format:"uint64"`
-	Layout   string `json:"layout,omitempty"`
-	Channels uint64 `json:"channels,omitempty" format:"uint64"`
+	Samplefmt string `json:"sample_fmt,omitempty"`
+	Sampling  uint64 `json:"sampling_hz,omitempty" format:"uint64"`
+	Layout    string `json:"layout,omitempty"`
+	Channels  uint64 `json:"channels,omitempty" format:"uint64"`
 
 	// avstream
 	AVstream *AVstream `json:"avstream" jsonschema:"anyof_type=null;object"`
@@ -77,6 +78,7 @@ func (i *ProgressIO) Unmarshal(io *app.ProgressIO) {
 	i.Quantizer = json.ToNumber(io.Quantizer)
 	i.Width = io.Width
 	i.Height = io.Height
+	i.Samplefmt = io.Samplefmt
 	i.Sampling = io.Sampling
 	i.Layout = io.Layout
 	i.Channels = io.Channels
@@ -105,6 +107,7 @@ func (i *ProgressIO) Marshal() app.ProgressIO {
 		Pixfmt:    i.Pixfmt,
 		Width:     i.Width,
 		Height:    i.Height,
+		Samplefmt: i.Samplefmt,
 		Sampling:  i.Sampling,
 		Layout:    i.Layout,
 		Channels:  i.Channels,
diff --git a/http/api/progress_test.go b/http/api/progress_test.go
index 812e434c..06837e10 100644
--- a/http/api/progress_test.go
+++ b/http/api/progress_test.go
@@ -114,6 +114,7 @@ func TestProgressIO(t *testing.T) {
 		Quantizer: 494.2,
 		Width:     10393,
 		Height:    4933,
+		Samplefmt: "fltp",
 		Sampling:  58483,
 		Layout:    "atmos",
 		Channels:  4944,
@@ -154,6 +155,7 @@ func TestProgressIOAVstream(t *testing.T) {
 		Quantizer: 494.2,
 		Width:     10393,
 		Height:    4933,
+		Samplefmt: "fltp",
 		Sampling:  58483,
 		Layout:    "atmos",
 		Channels:  4944,
@@ -220,6 +222,7 @@ func TestProgress(t *testing.T) {
 				Quantizer: 494.2,
 				Width:     10393,
 				Height:    4933,
+				Samplefmt: "fltp",
 				Sampling:  58483,
 				Layout:    "atmos",
 				Channels:  4944,
@@ -276,6 +279,7 @@ func TestProgress(t *testing.T) {
 				Quantizer: 494.2,
 				Width:     10393,
 				Height:    4933,
+				Samplefmt: "fltp",
 				Sampling:  58483,
 				Layout:    "atmos",
 				Channels:  4944,
diff --git a/restream/app/progress.go b/restream/app/progress.go
index d747ba67..c98ad0fd 100644
--- a/restream/app/progress.go
+++ b/restream/app/progress.go
@@ -36,9 +36,10 @@ type ProgressIO struct {
 	Height    uint64
 
 	// Audio
-	Sampling uint64
-	Layout   string
-	Channels uint64
+	Samplefmt string
+	Sampling  uint64
+	Layout    string
+	Channels  uint64
 
 	// avstream
 	AVstream *AVstream
@@ -65,6 +66,7 @@ func (p *ProgressIO) UnmarshalParser(pp *parse.ProgressIO) {
 	p.Quantizer = pp.Quantizer
 	p.Width = pp.Width
 	p.Height = pp.Height
+	p.Samplefmt = pp.Samplefmt
 	p.Sampling = pp.Sampling
 	p.Layout = pp.Layout
 	p.Channels = pp.Channels
@@ -99,6 +101,7 @@ func (p *ProgressIO) MarshalParser() parse.ProgressIO {
 		Quantizer: p.Quantizer,
 		Width:     p.Width,
 		Height:    p.Height,
+		Samplefmt: p.Samplefmt,
 		Sampling:  p.Sampling,
 		Layout:    p.Layout,
 		Channels:  p.Channels,
diff --git a/restream/app/progress_test.go b/restream/app/progress_test.go
index bfffa293..2cee5173 100644
--- a/restream/app/progress_test.go
+++ b/restream/app/progress_test.go
@@ -37,6 +37,7 @@ func TestProgressIO(t *testing.T) {
 		Quantizer: 2.3,
 		Width:     4848,
 		Height:    9373,
+		Samplefmt: "fltp",
 		Sampling:  4733,
 		Layout:    "atmos",
 		Channels:  83,
@@ -81,6 +82,7 @@ func TestProgressIOWithAVstream(t *testing.T) {
 		Quantizer: 2.3,
 		Width:     4848,
 		Height:    9373,
+		Samplefmt: "fltp",
 		Sampling:  4733,
 		Layout:    "atmos",
 		Channels:  83,
@@ -238,6 +240,7 @@ func TestProgress(t *testing.T) {
 				Quantizer: 2.3,
 				Width:     4848,
 				Height:    9373,
+				Samplefmt: "fltp",
 				Sampling:  4733,
 				Layout:    "atmos",
 				Channels:  83,
@@ -304,6 +307,7 @@ func TestProgress(t *testing.T) {
 				Quantizer: 2.3,
 				Width:     4848,
 				Height:    9373,
+				Samplefmt: "fltp",
 				Sampling:  4733,
 				Layout:    "atmos",
 				Channels:  83,