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• Windows Batch - Change the beginning of a path but keep the rest

  21 juin 2014, par o_ren

  I’m running FFMPEG for video encoding.
  I have a batch file which will encode files you drop on it, keeping the file’s original name and copy the encoded files to a specific directory.
  I would like that script to "know" the original’s file path and copy the encoded file to a path relative to it, meaning :
  original file dropped on batch file is in C :\some\folder\show\season\episode\file.mov
  encoded file should be encoded to D :\different\directory\show\season\episode\file.mp4
  The part of the path up until \show is fixed.

  This is what I have so far :
  

  @echo on
  
  
  
  set count=0
  
  for %%a in (%*) do (<br />
  
    if exist %%a (
  
  
  
          md \\specific\path\"%%~na"
  
  
  
          %MYFILES%\ffmpeg.exe -i "%%~a" -vcodec libx264 -preset medium -vprofile baseline -level 3.0 -b 500k -vf scale=640:-1 -acodec aac -strict -2 -ac 2 -ab 64k -ar 48000 "%%~na_500.mp4"
  
          copy "%%~na_500.mp4" "\\specific\path\"%%~na"\%%~na_500.mp4"
  
          copy "%%~na_500.mp4" "\\specific\path\"%%~na"\%%~na_500.mp4"
  
          del "%%~na_500.mp4"

  set /a count+=1

  ) else (
  echo Skipping non-existent %% a
  
  

  Thank you,
  Oren

• How to extract subtitles from .wtv file using ffmpeg ?

  20 mai 2013, par user1978421

  does anyone know how to extract subtitles from a wtv file using ffmpeg ?
  i have tried many different commands. None of them works.
  the closest is this one

  ffmpeg -i input.wtv -vn -an -codec:s:0 srt test.srt

  But it complains Error while encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  what does that really mean ??

  The complete console output is as follows

  ffmpeg version N-52233-gee94362 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr 18 2013 02:50:33 with gcc 4.8.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-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. 56.103 /  3. 56.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wtv @ 0269bac0] truncated file
  
      Last message repeated 3 times
  
  [mpeg2video @ 02692f60] Invalid frame dimensions 0x0.
  
      Last message repeated 12 times
  
  [wtv @ 0269bac0] max_analyze_duration 5000000 reached at 5016000 microseconds
  
  Input #0, wtv, from '16 and Pregnant- Unseen Moments_Viva_2013_04_09_19_57_00.wtv':
  
    Metadata:
  
      WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
  
      WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
  
      Title           : 16 and Pregnant: Unseen Moments
  
      WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
  
      genre           : Documentary;Reality TV
  
      WM/OriginalReleaseTime: 0
  
      WM/MediaCredits : ;;;
  
      service_provider: Viva
  
      service_name    : Viva
  
      WM/MediaOriginalChannel: 16
  
      WM/MediaOriginalChannelSubNumber: 0
  
      WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
  
      WM/MediaOriginalRunTime: 38377217299
  
      WM/MediaIsStereo: false
  
      WM/MediaIsRepeat: true
  
      WM/MediaIsLive  : false
  
      WM/MediaIsTape  : false
  
      WM/MediaIsDelay : false
  
      WM/MediaIsSubtitled: false
  
      WM/MediaIsMovie : false
  
      WM/MediaIsPremiere: false
  
      WM/MediaIsFinale: false
  
      WM/MediaIsSAP   : false
  
      WM/MediaIsSport : false
  
      WM/Provider     : MediaCenterDefault
  
      WM/VideoClosedCaptioning: false
  
      WM/WMRVEncodeTime: 2013-04-09 18:57:02
  
      WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
  
      WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
  
      WM/WMRVProgramID: !MCProgram!37282063
  
      WM/WMRVRequestID: 0
  
      WM/WMRVScheduleItemID: 0
  
      WM/WMRVQuality  : 0
  
      WM/WMRVOriginalSoftPrePadding: 480
  
      WM/WMRVOriginalSoftPostPadding: 60
  
      WM/WMRVHardPrePadding: -300
  
      WM/WMRVHardPostPadding: 0
  
      WM/WMRVATSCContent: false
  
      WM/WMRVDTVContent: true
  
      WM/WMRVHDContent: false
  
      Duration        : 38379654765
  
      WM/WMRVEndTime  : 2013-04-09 20:01:00
  
      WM/WMRVBitrate  : 2.118481
  
      WM/WMRVKeepUntil: 0
  
      WM/WMRVActualSoftPrePadding: 477
  
      WM/WMRVActualSoftPostPadding: 60
  
      WM/WMRVContentProtected: false
  
      WM/WMRVContentProtectedPercent: 0
  
      WM/WMRVExpirationSpan: 9223372036854775807
  
      WM/WMRVInBandRatingSystem: 255
  
      WM/WMRVInBandRatingLevel: 255
  
      WM/WMRVInBandRatingAttributes: 0
  
      WM/WMRVWatched  : true
  
    Duration: 01:03:58.07, start: 1.509175, bitrate: 2118 kb/s
  
      Stream #0:0[0x22](eng): Subtitle: dvb_subtitle
  
      Stream #0:1[0x23](eng): Audio: mp2 (P[0][0][0] / 0x0050), 48000 Hz, stereo, s16p, 256 kb/s
  
      Stream #0:2[0x24]: Video: mpeg2video (Main), yuv420p, 544x576 [SAR 32:17 DAR 16:9], 25 fps, 25 tbr, 10000k tbn, 50 tbc
  
      Stream #0:3[0x0]: Video: mjpeg, yuvj420p, 189x200 [SAR 96:96 DAR 189:200], 90k tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        title           : TV Thumbnail
  
  File 'test.srt' already exists. Overwrite ? [y/N] Output #0, srt, to 'test.srt':
  
    Metadata:
  
      WM/MediaClassPrimaryID: db9830bd-3ab3-4fab-8a371a995f7ff74
  
      WM/MediaClassSecondaryID: ba7f258a-62f7-47a9-b21f4651c42a000
  
      Title           : 16 and Pregnant: Unseen Moments
  
      WM/SubTitleDescription: Dr Drew hosts a look at the exclusive moments we didn't see from the second season of 16 and Pregnant.
  
      genre           : Documentary;Reality TV
  
      WM/OriginalReleaseTime: 0
  
      WM/MediaCredits : ;;;
  
      service_provider: Viva
  
      service_name    : Viva
  
      WM/MediaOriginalChannel: 16
  
      WM/MediaOriginalChannelSubNumber: 0
  
      WM/MediaOriginalBroadcastDateTime: 2011-12-13T00:00:00Z
  
      WM/MediaOriginalRunTime: 38377217299
  
      WM/MediaIsStereo: false
  
      WM/MediaIsRepeat: true
  
      WM/MediaIsLive  : false
  
      WM/MediaIsTape  : false
  
      WM/MediaIsDelay : false
  
      WM/MediaIsSubtitled: false
  
      WM/MediaIsMovie : false
  
      WM/MediaIsPremiere: false
  
      WM/MediaIsFinale: false
  
      WM/MediaIsSAP   : false
  
      WM/MediaIsSport : false
  
      WM/Provider     : MediaCenterDefault
  
      WM/VideoClosedCaptioning: false
  
      WM/WMRVEncodeTime: 2013-04-09 18:57:02
  
      WM/WMRVSeriesUID: !GenericSeries!16 and Pregnant: Unseen Moments
  
      WM/WMRVServiceID: !Generated!be3ff88ee57a4cadb0334ef3df5bc91b
  
      WM/WMRVProgramID: !MCProgram!37282063
  
      WM/WMRVRequestID: 0
  
      WM/WMRVScheduleItemID: 0
  
      WM/WMRVQuality  : 0
  
      WM/WMRVOriginalSoftPrePadding: 480
  
      WM/WMRVOriginalSoftPostPadding: 60
  
      WM/WMRVHardPrePadding: -300
  
      WM/WMRVHardPostPadding: 0
  
      WM/WMRVATSCContent: false
  
      WM/WMRVDTVContent: true
  
      WM/WMRVHDContent: false
  
      Duration        : 38379654765
  
      WM/WMRVEndTime  : 2013-04-09 20:01:00
  
      WM/WMRVBitrate  : 2.118481
  
      WM/WMRVKeepUntil: 0
  
      WM/WMRVActualSoftPrePadding: 477
  
      WM/WMRVActualSoftPostPadding: 60
  
      WM/WMRVContentProtected: false
  
      WM/WMRVContentProtectedPercent: 0
  
      WM/WMRVExpirationSpan: 9223372036854775807
  
      WM/WMRVInBandRatingSystem: 255
  
      WM/WMRVInBandRatingLevel: 255
  
      WM/WMRVInBandRatingAttributes: 0
  
      WM/WMRVWatched  : true
  
      Stream #0:0(eng): Subtitle: srt
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dvbsub -> srt)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• 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()
    }

}