snapshot of https://github.com/pion/webrtc.git (main, 2026-09-15; blobs > 131072B omitted)

examples/save-to-disk-av1/README.md

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+# save-to-disk-av1
+save-to-disk-av1 is a simple application that shows how to save a video to disk using AV1.
+
+If you wish to save VP8 and Opus instead of AV1 see [save-to-disk](https://github.com/pion/webrtc/tree/main/examples/save-to-disk)
+
+If you wish to save VP8/Opus inside the same file see [save-to-webm](https://github.com/pion/example-webrtc-applications/tree/main/save-to-webm)
+
+You can then send this video back to your browser using [play-from-disk](https://github.com/pion/webrtc/tree/main/examples/play-from-disk)
+
+## Instructions
+### Download save-to-disk-av1
+```
+go install github.com/pion/webrtc/v4/examples/save-to-disk-av1@latest
+```
+
+### Open save-to-disk-av1 example page
+[jsfiddle.net](https://jsfiddle.net/8jv91r25/) you should see your Webcam, two text-areas and two buttons: `Copy browser SDP to clipboard`, `Start Session`.
+
+### Run save-to-disk-av1, with your browsers SessionDescription as stdin
+In the jsfiddle the top textarea is your browser's Session Description. Press `Copy browser SDP to clipboard` or copy the base64 string manually.
+We will use this value in the next step.
+
+#### Linux/macOS
+Run `echo $BROWSER_SDP | save-to-disk-av1`
+#### Windows
+1. Paste the SessionDescription into a file.
+1. Run `save-to-disk-av1 < my_file`
+
+### Input save-to-disk-av1's SessionDescription into your browser
+Copy the text that `save-to-disk-av1` just emitted and copy into second text area
+
+### Hit 'Start Session' in jsfiddle, wait, close jsfiddle, enjoy your video!
+In the folder you ran `save-to-disk-av1` you should now have a file `output.ivf` play with your video player of choice!
+> Note: In order to correctly create the files, the remote client (JSFiddle) should be closed. The Go example will automatically close itself.
+
+Congrats, you have used Pion WebRTC! Now start building something cool

examples/save-to-disk-av1/main.go

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+// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+//go:build !js
+
+// save-to-disk-av1 is a simple application that shows how to save a video to disk using AV1.
+package main
+
+import (
+	"bufio"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/pion/interceptor"
+	"github.com/pion/interceptor/pkg/intervalpli"
+	"github.com/pion/webrtc/v4"
+	"github.com/pion/webrtc/v4/pkg/media"
+	"github.com/pion/webrtc/v4/pkg/media/ivfwriter"
+)
+
+func saveToDisk(writer media.Writer, track *webrtc.TrackRemote) {
+	defer func() {
+		if err := writer.Close(); err != nil {
+			panic(err)
+		}
+	}()
+
+	for {
+		rtpPacket, _, err := track.ReadRTP()
+		if err != nil {
+			fmt.Println(err)
+
+			return
+		}
+		if err := writer.WriteRTP(rtpPacket); err != nil {
+			fmt.Println(err)
+
+			return
+		}
+	}
+}
+
+// nolint:cyclop
+func main() {
+	// Everything below is the Pion WebRTC API! Thanks for using it ❤️.
+
+	// Create a MediaEngine object to configure the supported codec
+	mediaEngine := &webrtc.MediaEngine{}
+
+	if err := mediaEngine.RegisterCodec(webrtc.RTPCodecParameters{
+		RTPCodecCapability: webrtc.RTPCodecCapability{
+			MimeType:     webrtc.MimeTypeAV1,
+			ClockRate:    90000,
+			Channels:     0,
+			SDPFmtpLine:  "",
+			RTCPFeedback: nil,
+		},
+		PayloadType: 96,
+	}, webrtc.RTPCodecTypeVideo); err != nil {
+		panic(err)
+	}
+
+	// Create a InterceptorRegistry. This is the user configurable RTP/RTCP Pipeline.
+	// This provides NACKs, RTCP Reports and other features. If you use `webrtc.NewPeerConnection`
+	// this is enabled by default. If you are manually managing You MUST create a InterceptorRegistry
+	// for each PeerConnection.
+	interceptorRegistry := &interceptor.Registry{}
+
+	// Register a intervalpli factory
+	// This interceptor sends a PLI every 3 seconds. A PLI causes a video keyframe to be generated by the sender.
+	// This makes our video seekable and more error resilent, but at a cost of lower picture quality and higher bitrates
+	// A real world application should process incoming RTCP packets from viewers and forward them to senders
+	intervalPliFactory, err := intervalpli.NewReceiverInterceptor()
+	if err != nil {
+		panic(err)
+	}
+	interceptorRegistry.Add(intervalPliFactory)
+
+	// Use the default set of Interceptors
+	if err = webrtc.RegisterDefaultInterceptors(mediaEngine, interceptorRegistry); err != nil {
+		panic(err)
+	}
+
+	// Create the API object with the MediaEngine
+	api := webrtc.NewAPI(webrtc.WithMediaEngine(mediaEngine), webrtc.WithInterceptorRegistry(interceptorRegistry))
+
+	// Prepare the configuration
+	config := webrtc.Configuration{}
+
+	// Create a new RTCPeerConnection
+	peerConnection, err := api.NewPeerConnection(config)
+	if err != nil {
+		panic(err)
+	}
+
+	// Allow us to receive 1 video track
+	if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeVideo); err != nil {
+		panic(err)
+	}
+
+	ivfFile, err := ivfwriter.New("output.ivf", ivfwriter.WithCodec(webrtc.MimeTypeAV1))
+	if err != nil {
+		panic(err)
+	}
+
+	// Set a handler for when a new remote track starts, this handler saves buffers to disk as
+	// an ivf file, since we could have multiple video tracks we provide a counter.
+	// In your application this is where you would handle/process video
+	peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) { //nolint: revive
+		if strings.EqualFold(track.Codec().MimeType, webrtc.MimeTypeAV1) {
+			fmt.Println("Got AV1 track, saving to disk as output.ivf")
+			saveToDisk(ivfFile, track)
+		}
+	})
+
+	// Set the handler for ICE connection state
+	// This will notify you when the peer has connected/disconnected
+	peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
+		fmt.Printf("Connection State has changed %s \n", connectionState.String())
+
+		if connectionState == webrtc.ICEConnectionStateConnected {
+			fmt.Println("Ctrl+C the remote client to stop the demo")
+		} else if connectionState == webrtc.ICEConnectionStateFailed || connectionState == webrtc.ICEConnectionStateClosed {
+			if closeErr := ivfFile.Close(); closeErr != nil {
+				panic(closeErr)
+			}
+
+			fmt.Println("Done writing media files")
+
+			// Gracefully shutdown the peer connection
+			if closeErr := peerConnection.Close(); closeErr != nil {
+				panic(closeErr)
+			}
+
+			os.Exit(0)
+		}
+	})
+
+	// Wait for the offer to be pasted
+	offer := webrtc.SessionDescription{}
+	decode(readUntilNewline(), &offer)
+
+	// Set the remote SessionDescription
+	err = peerConnection.SetRemoteDescription(offer)
+	if err != nil {
+		panic(err)
+	}
+
+	// Create answer
+	answer, err := peerConnection.CreateAnswer(nil)
+	if err != nil {
+		panic(err)
+	}
+
+	// Create channel that is blocked until ICE Gathering is complete
+	gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
+
+	// Sets the LocalDescription, and starts our UDP listeners
+	err = peerConnection.SetLocalDescription(answer)
+	if err != nil {
+		panic(err)
+	}
+
+	// Block until ICE Gathering is complete, disabling trickle ICE
+	// we do this because we only can exchange one signaling message
+	// in a production application you should exchange ICE Candidates via OnICECandidate
+	<-gatherComplete
+
+	// Output the answer in base64 so we can paste it in browser
+	fmt.Println(encode(peerConnection.LocalDescription()))
+
+	// Block forever
+	select {}
+}
+
+// Read from stdin until we get a newline.
+func readUntilNewline() (in string) {
+	var err error
+
+	r := bufio.NewReader(os.Stdin)
+	for {
+		in, err = r.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			panic(err)
+		}
+
+		if in = strings.TrimSpace(in); len(in) > 0 {
+			break
+		}
+	}
+
+	fmt.Println("")
+
+	return
+}
+
+// JSON encode + base64 a SessionDescription.
+func encode(obj *webrtc.SessionDescription) string {
+	b, err := json.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+// Decode a base64 and unmarshal JSON into a SessionDescription.
+func decode(in string, obj *webrtc.SessionDescription) {
+	b, err := base64.StdEncoding.DecodeString(in)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(b, obj); err != nil {
+		panic(err)
+	}
+}