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• Read H264 Bytestream from Spring Boot to Angular

  22 février 2023, par Akthar

  I have a socket connection from which I receive an H264 byte stream from a camera, I need a way to transmit the bytestream to my front-end Angular application. How can this be achieved ?

  


• What's the most desireable way to capture system display and audio in the form of individual encoded audio and video packets in go (language) ? [closed]

  11 janvier 2023, par Tiger Yang

  Question (read the context below first) :

  


  For those of you familiar with the capabilities of go, Is there a better way to go about all this ? Since ffmpeg is so ubiquitous, I'm sure it's been optomized to perfection, but what's the best way to capture system display and audio in the form of individual encoded audio and video packets in go (language), so that they can be then sent via webtransport-go ? I wish for it to prioritize efficiency and low latency, and ideally capture and encode the framebuffer directly like ffmpeg does.

  


  Thanks ! I have many other questions about this, but I think it's best to ask as I go.

  


  Context and what I've done so far :

  


  I'm writing a remote desktop software for my personal use because of grievances with current solutions out there. At the moment, it consists of a web app that uses the webtransport API to send input datagrams and receive AV packets on two dedicated unidirectional streams, and the webcodecs API to decode these packets. On the serverside, I originally planned to use python with the aioquic library as a webtransport server. Upon connection and authentication, the server would start ffmpeg as a subprocess with this command :

  


  ffmpeg -init_hw_device d3d11va -filter_complex ddagrab=video_size=1920x1080:framerate=60 -vcodec hevc_nvenc -tune ll -preset p7 -spatial_aq 1 -temporal_aq 1 -forced-idr 1 -rc cbr -b:v 400K -no-scenecut 1 -g 216000 -f hevc -

  


  What I really appreciate about this is that it uses windows' desktop duplication API to copy the framebuffer of my GPU and hand that directly to the on-die hardware encoder with zero round trips to the CPU. I think it's about as efficient and elegant a solution as I can manage. It then outputs the encoded stream to the stdout, which python can read and send to the client.

  


  As for the audio, there is another ffmpeg instance :

  


  ffmpeg -f dshow -channels 2 -sample_rate 48000 -sample_size 16 -audio_buffer_size 15 -i audio="RD Audio (High Definition Audio Device)" -acodec libopus -vbr on -application audio -mapping_family 0 -apply_phase_inv true -b:a 25K -fec false -packet_loss 0 -map 0 -f data -

  


  which listens to a physical loopback interface, which is literally just a short wire bridging the front panel headphone and microphone jacks (I'm aware of the quality loss of converting to analog and back, but the audio is then crushed down to 25kbps so it's fine) ()

  


  Unfortunately, aioquic was not easy to work with IMO, and I found webtransport-go https://github.com/adriancable/webtransport-go, which was a hell of a lot better in both simplicity and documentation. However, now I'm dealing with a whole new language, and I wanna ask : (above)

  


  EDIT : Here's the code for my server so far :

  


  


  


  package main

import (
    "bytes"
    "context"
    "fmt"
    "log"
    "net/http"
    "os/exec"
    "time"

    "github.com/adriancable/webtransport-go"
)

func warn(str string) {
    fmt.Printf("\n===== WARNING ===================================================================================================\n   %s\n=================================================================================================================\n", str)
}

func main() {

    password := []byte("abc")

    videoString := []string{
        "ffmpeg",
        "-init_hw_device", "d3d11va",
        "-filter_complex", "ddagrab=video_size=1920x1080:framerate=60",
        "-vcodec", "hevc_nvenc",
        "-tune", "ll",
        "-preset", "p7",
        "-spatial_aq", "1",
        "-temporal_aq", "1",
        "-forced-idr", "1",
        "-rc", "cbr",
        "-b:v", "500K",
        "-no-scenecut", "1",
        "-g", "216000",
        "-f", "hevc", "-",
    }

    audioString := []string{
        "ffmpeg",
        "-f", "dshow",
        "-channels", "2",
        "-sample_rate", "48000",
        "-sample_size", "16",
        "-audio_buffer_size", "15",
        "-i", "audio=RD Audio (High Definition Audio Device)",
        "-acodec", "libopus",
        "-mapping_family", "0",
        "-b:a", "25K",
        "-map", "0",
        "-f", "data", "-",
    }

    connected := false

    http.HandleFunc("/", func(writer http.ResponseWriter, request *http.Request) {
        session := request.Body.(*webtransport.Session)

        session.AcceptSession()
        fmt.Println("\nAccepted incoming WebTransport connection.")
        fmt.Println("Awaiting authentication...")

        authData, err := session.ReceiveMessage(session.Context()) // Waits here till first datagram
        if err != nil {                                            // if client closes connection before sending anything
            fmt.Println("\nConnection closed:", err)
            return
        }

        if len(authData) >= 2 && bytes.Equal(authData[2:], password) {
            if connected {
                session.CloseSession()
                warn("Client has authenticated, but a session is already taking place! Connection closed.")
                return
            } else {
                connected = true
                fmt.Println("Client has authenticated!\n")
            }
        } else {
            session.CloseSession()
            warn("Client has failed authentication! Connection closed. (" + string(authData[2:]) + ")")
            return
        }

        videoStream, _ := session.OpenUniStreamSync(session.Context())

        videoCmd := exec.Command(videoString[0], videoString[1:]...)
        go func() {
            videoOut, _ := videoCmd.StdoutPipe()
            videoCmd.Start()

            buffer := make([]byte, 15000)
            for {
                len, err := videoOut.Read(buffer)
                if err != nil {
                    break
                }
                if len > 0 {
                    videoStream.Write(buffer[:len])
                }
            }
        }()

        time.Sleep(50 * time.Millisecond)

        audioStream, err := session.OpenUniStreamSync(session.Context())

        audioCmd := exec.Command(audioString[0], audioString[1:]...)
        go func() {
            audioOut, _ := audioCmd.StdoutPipe()
            audioCmd.Start()

            buffer := make([]byte, 15000)
            for {
                len, err := audioOut.Read(buffer)
                if err != nil {
                    break
                }
                if len > 0 {
                    audioStream.Write(buffer[:len])
                }
            }
        }()

        for {
            data, err := session.ReceiveMessage(session.Context())
            if err != nil {
                videoCmd.Process.Kill()
                audioCmd.Process.Kill()

                connected = false

                fmt.Println("\nConnection closed:", err)
                break
            }

            if len(data) == 0 {

            } else if data[0] == byte(0) {
                fmt.Printf("Received mouse datagram: %s\n", data)
            }
        }

    })

    server := &webtransport.Server{
        ListenAddr: ":1024",
        TLSCert:    webtransport.CertFile{Path: "SSL/fullchain.pem"},
        TLSKey:     webtransport.CertFile{Path: "SSL/privkey.pem"},
        QuicConfig: &webtransport.QuicConfig{
            KeepAlive:      false,
            MaxIdleTimeout: 3 * time.Second,
        },
    }

    fmt.Println("Launching WebTransport server at", server.ListenAddr)
    ctx, cancel := context.WithCancel(context.Background())
    if err := server.Run(ctx); err != nil {
        log.Fatal(err)
        cancel()
    }

}

  


  


  



• ffmpeg : creating a mpeg1 video stream

  7 mars 2014, par phill

  i'm trying to create a short video file out of a single image for 5 seconds on a windows machine using ffmpeg. The video file is to be used to concat in front of video files taken with a camera that produces 1920x1080 60fps. The following creates 1 second stream instead of a 5 second one. Any ideas ? thanks advance.

  "c :\program files\ffmpeg\ffmpeg32" -f image2 -i "c :\program files\ffmpeg\imput1.jpg" -loop 1 -vcodec mpeg1video -b:v
  104857200 -r 59.94 -s 1920x1080 -aspect 16:9 -t 5 "c :\program files\ffmpeg\banner.MPG"

  Here are my output results :

  c :\Program Files\ffmpeg>"c :\program files\ffmpeg\ffmpeg32" -f image2 -i "input1.jpg" -loop 1 -vcodec mpeg1video -b:v 10
  4857200 -r 59.94 -s 1920x1080 -aspect 16:9 -t 5 "c :\program files\ffmpeg\banner.
  MPG"
  ffmpeg version N-52045-g694fa00 Copyright (c) 2000-2013 the FFmpeg developers
  built on Apr 12 2013 16:54:51 with gcc 4.8.0 (GCC)
  configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-av
  isynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enab
  le-iconv —enable-libass —enable-libbluray —enable-libcaca —enable-libfreetyp
  e —enable-libgsm —enable-libilbc —enable-libmp3lame —enable-libopencore-amrn
  b —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libr
  tmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheo
  ra —enable-libtwolame —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-li
  bvorbis —enable-libvpx —enable-libx264 —enable-libxavs —enable-libxvid —ena
  ble-zlib
  libavutil 52. 26.100 / 52. 26.100
  libavcodec 55. 2.100 / 55. 2.100
  libavformat 55. 2.100 / 55. 2.100
  libavdevice 55. 0.100 / 55. 0.100
  libavfilter 3. 53.101 / 3. 53.101
  libswscale 2. 2.100 / 2. 2.100
  libswresample 0. 17.102 / 0. 17.102
  libpostproc 52. 3.100 / 52. 3.100
  Input #0, image2, from 'c :\program files\ffmpeg\input1.jpg' :
  Duration : 00:00:00.04, start : 0.000000, bitrate : N/A
  Stream #0:0 : Video : mjpeg, yuvj420p, 722x267 [SAR 1:1 DAR 722:267], 25 tbr,
  25 tbn, 25 tbc
  File 'c :\program files\ffmpeg\banner.MPG' already exists. Overwrite ? [y/N] y
  VBV buffer size not set, muxing may fail
  Output #0, mpeg, to 'c :\program files\ffmpeg\banner.MPG' :
  Metadata :
  encoder : Lavf55.2.100
  Stream #0:0 : Video : mpeg1video, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-3
  1, 104857 kb/s, 90k tbn, 59.94 tbc
  Stream mapping :
  Stream #0:0 -> #0:0 (mjpeg -> mpeg1video)
  Press [q] to stop, [?] for help
  frame= 1 fps=0.0 q=9.8 Lsize= 130kB time=00:00:00.01 bitrate=63812.1kbits
  /s
  video:130kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.373990%

  c :\Program Files\ffmpeg>