diff --git a/go.mod b/go.mod
index 830e498e28a..8c7db108204 100644
--- a/go.mod
+++ b/go.mod
@@ -10,8 +10,8 @@ require (
 	github.com/alecthomas/kong v1.7.0
 	github.com/asticode/go-astits v1.13.0
 	github.com/bluenviron/gohlslib/v2 v2.1.3
-	github.com/bluenviron/gortsplib/v4 v4.12.2
-	github.com/bluenviron/mediacommon v1.13.4
+	github.com/bluenviron/gortsplib/v4 v4.12.3
+	github.com/bluenviron/mediacommon v1.14.0
 	github.com/datarhei/gosrt v0.8.0
 	github.com/fsnotify/fsnotify v1.8.0
 	github.com/gin-contrib/pprof v1.5.2
diff --git a/go.sum b/go.sum
index abcb1824992..d2d9cf95f55 100644
--- a/go.sum
+++ b/go.sum
@@ -33,10 +33,10 @@ github.com/benburkert/openpgp v0.0.0-20160410205803-c2471f86866c h1:8XZeJrs4+ZYh
 github.com/benburkert/openpgp v0.0.0-20160410205803-c2471f86866c/go.mod h1:x1vxHcL/9AVzuk5HOloOEPrtJY0MaalYr78afXZ+pWI=
 github.com/bluenviron/gohlslib/v2 v2.1.3 h1:pysG7F76uCdjSVApwaOjKhiugGab/4t9wZOUKFn5s64=
 github.com/bluenviron/gohlslib/v2 v2.1.3/go.mod h1:l99DjPGFms1XR3cxSZ+BIdFgMjJ5cFt/2Z/h+rrdIYQ=
-github.com/bluenviron/gortsplib/v4 v4.12.2 h1:ZCiveyk8gumqyVGdliUmfaTJFOSt0JoqsPJ/Ly3gOXI=
-github.com/bluenviron/gortsplib/v4 v4.12.2/go.mod h1:QCUYd9eiD44ISFGvgUSbGgJjgjpalYb0SlsHzJ/h0FQ=
-github.com/bluenviron/mediacommon v1.13.4 h1:SkMeGHxKDBxBjxjRFVhQKUj11CApLq6QpTJGBR8PfDY=
-github.com/bluenviron/mediacommon v1.13.4/go.mod h1:z5LP9Tm1ZNfQV5Co54PyOzaIhGMusDfRKmh42nQSnyo=
+github.com/bluenviron/gortsplib/v4 v4.12.3 h1:3EzbyGb5+MIOJQYiWytRegFEP4EW5paiyTrscQj63WE=
+github.com/bluenviron/gortsplib/v4 v4.12.3/go.mod h1:SkZPdaMNr+IvHt2PKRjUXxZN6FDutmSZn4eT0GmF0sk=
+github.com/bluenviron/mediacommon v1.14.0 h1:lWCwOBKNKgqmspRpwpvvg3CidYm+XOc2+z/Jw7LM5dQ=
+github.com/bluenviron/mediacommon v1.14.0/go.mod h1:z5LP9Tm1ZNfQV5Co54PyOzaIhGMusDfRKmh42nQSnyo=
 github.com/bytedance/sonic v1.12.6 h1:/isNmCUF2x3Sh8RAp/4mh4ZGkcFAX/hLrzrK3AvpRzk=
 github.com/bytedance/sonic v1.12.6/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
 github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
diff --git a/internal/protocols/rtmp/reader.go b/internal/protocols/rtmp/reader.go
index 250ee64ebb4..0d6762bd84a 100644
--- a/internal/protocols/rtmp/reader.go
+++ b/internal/protocols/rtmp/reader.go
@@ -579,7 +579,8 @@ func (r *Reader) OnDataH265(track *format.H265, cb OnDataH26xFunc) {
 	r.onVideoData[r.videoTrackID(track)] = func(msg message.Message) error {
 		switch msg := msg.(type) {
 		case *message.VideoExFramesX:
-			au, err := h264.AVCCUnmarshal(msg.Payload)
+			var au h264.AVCC
+			err := au.Unmarshal(msg.Payload)
 			if err != nil {
 				if errors.Is(err, h264.ErrAVCCNoNALUs) {
 					return nil
@@ -590,7 +591,8 @@ func (r *Reader) OnDataH265(track *format.H265, cb OnDataH26xFunc) {
 			cb(msg.DTS, au)
 
 		case *message.VideoExCodedFrames:
-			au, err := h264.AVCCUnmarshal(msg.Payload)
+			var au h264.AVCC
+			err := au.Unmarshal(msg.Payload)
 			if err != nil {
 				if errors.Is(err, h264.ErrAVCCNoNALUs) {
 					return nil
@@ -625,7 +627,8 @@ func (r *Reader) OnDataH264(track *format.H264, cb OnDataH26xFunc) {
 				cb(msg.DTS+msg.PTSDelta, au)
 
 			case message.VideoTypeAU:
-				au, err := h264.AVCCUnmarshal(msg.Payload)
+				var au h264.AVCC
+				err := au.Unmarshal(msg.Payload)
 				if err != nil {
 					if errors.Is(err, h264.ErrAVCCNoNALUs) {
 						return nil
@@ -639,7 +642,8 @@ func (r *Reader) OnDataH264(track *format.H264, cb OnDataH26xFunc) {
 			return nil
 
 		case *message.VideoExFramesX:
-			au, err := h264.AVCCUnmarshal(msg.Payload)
+			var au h264.AVCC
+			err := au.Unmarshal(msg.Payload)
 			if err != nil {
 				if errors.Is(err, h264.ErrAVCCNoNALUs) {
 					return nil
@@ -650,7 +654,8 @@ func (r *Reader) OnDataH264(track *format.H264, cb OnDataH26xFunc) {
 			cb(msg.DTS, au)
 
 		case *message.VideoExCodedFrames:
-			au, err := h264.AVCCUnmarshal(msg.Payload)
+			var au h264.AVCC
+			err := au.Unmarshal(msg.Payload)
 			if err != nil {
 				if errors.Is(err, h264.ErrAVCCNoNALUs) {
 					return nil
diff --git a/internal/protocols/rtmp/writer.go b/internal/protocols/rtmp/writer.go
index 575d0d11de2..9b6942fd80e 100644
--- a/internal/protocols/rtmp/writer.go
+++ b/internal/protocols/rtmp/writer.go
@@ -167,7 +167,7 @@ func (w *Writer) writeTracks(videoTrack format.Format, audioTrack format.Format)
 
 // WriteH264 writes H264 data.
 func (w *Writer) WriteH264(pts time.Duration, dts time.Duration, au [][]byte) error {
-	avcc, err := h264.AVCCMarshal(au)
+	avcc, err := h264.AVCC(au).Marshal()
 	if err != nil {
 		return err
 	}
diff --git a/internal/recorder/format_fmp4.go b/internal/recorder/format_fmp4.go
index b58e2ddaba9..ae7adef191b 100644
--- a/internal/recorder/format_fmp4.go
+++ b/internal/recorder/format_fmp4.go
@@ -183,9 +183,7 @@ func (f *formatFMP4) initialize() bool {
 							firstReceived = true
 						}
 
-						sampl, err := fmp4.NewPartSampleAV1(
-							randomAccess,
-							tunit.TU)
+						sampl, err := fmp4.NewPartSampleAV12(tunit.TU)
 						if err != nil {
 							return err
 						}
@@ -346,9 +344,8 @@ func (f *formatFMP4) initialize() bool {
 							return err
 						}
 
-						sampl, err := fmp4.NewPartSampleH26x(
+						sampl, err := fmp4.NewPartSampleH265(
 							int32(tunit.PTS-dts),
-							randomAccess,
 							tunit.AU)
 						if err != nil {
 							return err
@@ -421,9 +418,8 @@ func (f *formatFMP4) initialize() bool {
 							return err
 						}
 
-						sampl, err := fmp4.NewPartSampleH26x(
+						sampl, err := fmp4.NewPartSampleH264(
 							int32(tunit.PTS-dts),
-							randomAccess,
 							tunit.AU)
 						if err != nil {
 							return err