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Autres articles (53)

  • Mise à jour de la version 0.1 vers 0.2

    24 juin 2013, par

    Explications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
    Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...)

  • Personnaliser en ajoutant son logo, sa bannière ou son image de fond

    5 septembre 2013, par

    Certains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;

  • Ecrire une actualité

    21 juin 2013, par

    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
    Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)

Sur d’autres sites (7442)

  • Video Streaming shows not working in Micorsoft Edge

    22 novembre 2018, par Ragesh S

    I am newbi in using Video streaming in ASP.Net MVC project. I have a video library webpplication, most of the videos are .mp4 format. Please see my code below.

    Code

    public HttpResponseMessage Get(string filename)
    
    {
    
        var filePath = new FileStreameHelpers().GetFilePath(filename);
    
        if (!File.Exists(filePath))
    
            return new HttpResponseMessage(HttpStatusCode.NotFound);
    

    
        var response = Request.CreateResponse();
    
        response.Headers.AcceptRanges.Add("bytes");
    

    
        var streamer = new FileStreameHelpers();
    
        streamer.FileInfo = new FileInfo(filePath);
    
        response.Content = new PushStreamContent(streamer.WriteToStream, new FileStreameHelpers().GetMimeType(Path.GetExtension(filePath)));
    

    
        RangeHeaderValue rangeHeader = Request.Headers.Range;
    
        if (rangeHeader != null)
    
        {
    
            long totalLength = streamer.FileInfo.Length;
    
            var range = rangeHeader.Ranges.First();
    
            streamer.Start = range.From ?? 0;
    
            streamer.End = range.To ?? totalLength - 1;
    

    
            response.Content.Headers.ContentLength = streamer.End - streamer.Start + 1;
    
            response.Content.Headers.ContentRange = new ContentRangeHeaderValue(streamer.Start, streamer.End,
    
                totalLength);
    
            response.StatusCode = HttpStatusCode.PartialContent;
    
        }
    
        else
    
        {
    
            response.StatusCode = HttpStatusCode.OK;
    
        }
    

    
        return response;
    
    }
    
  public async Task WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
    
    {
    
        try
    
        {
    
            var buffer = new byte[6553600];
    
            using (var video = FileInfo.OpenRead())
    
            {
    
                if (End == -1)
    
                {
    
                    End = video.Length;
    
                }
    
                var position = Start;
    
                var bytesLeft = End - Start + 1;
    
                video.Position = Start;
    
                while (position <= End)
    
                {
    
                    var bytesRead = video.Read(buffer, 0, (int)Math.Min(bytesLeft, buffer.Length));
    
                    await outputStream.WriteAsync(buffer, 0, bytesRead);
    
                    position += bytesRead;
    
                    bytesLeft = End - position + 1;
    
                }
    
            }
    
        }
    
        catch (Exception ex)
    
        {
    
            // fail silently
    
            Utilities.SaveException("FileStreameHelpers - WriteToStream", ex);
    
        }
    
        finally
    
        {
    
            outputStream.Close();
    
        }
    
    }

    it works fine in Firefox and Chrome but it shows error in Microsoft Edge browser like below.

    HTML

    <video width="320" height="240" controls="controls">
    
    <source src="/api/Media/Get?filename=SampleVideo_1280x720_1mb.mp4" type="video/mp4">
    
    Your browser does not support the video tag.
    
</source></video>

    The remote host closed the connection. The error code is 0x800703E3.

    Please advice.

  • getting errors from FFMpeg when spawned from .NET

    18 mars 2014, par Brannon

    When I run FFMpeg from the command line like this

    ffmpeg.exe -hwaccel auto -re -i "C:\Users\Public\Videos\Sample Videos\Wildlife.wmv" -an -sn -c:v bmp -pix_fmt bgr24 -f rawvideo - > junk.bin

    it works fine. However, when I spawn the exact same thing (minus > junk.bin) I get this nasty "bad header" error after a few seconds of playback. What is causing this ? I have trouble believing my process blocks the pipe longer than the filesystem does, but it should be able to block the pipe indefinitely without defeating the decoding. The truncated stderr is below. My code to spawn the thing is here.

    ffmpeg version N-60761-g916a792 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Feb 19 2014 21:57:22 with gcc 4.8.2 (GCC)
    
  configuration: --target-os=mingw32 --enable-shared --enable-runtime-cpudetect
    
  libavutil      52. 65.100 / 52. 65.100
    
  libavcodec     55. 52.102 / 55. 52.102
    
  libavformat    55. 33.100 / 55. 33.100
    
  libavdevice    55. 10.100 / 55. 10.100
    
  libavfilter     4.  1.103 /  4.  1.103
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
cygwin warning:
    
  MS-DOS style path detected: C:\Users\Public\Videos\Sample Videos\Wildlife.wmv
    
  Preferred POSIX equivalent is: /cygdrive/c/Users/Public/Videos/Sample Videos/Wildlife.wmv
    
  CYGWIN environment variable option "nodosfilewarning" turns off this warning.
    
  Consult the user&#39;s guide for more details about POSIX paths:
    
    http://cygwin.com/cygwin-ug-net/using.html#using-pathnames
    
[asf @ 0x600059480] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Guessed Channel Layout for  Input Stream #0.0 : stereo
    
Input #0, asf, from &#39;C:\Users\Public\Videos\Sample Videos\Wildlife.wmv&#39;:
    
  Metadata:
    
    SfOriginalFPS   : 299700
    
    WMFSDKVersion   : 11.0.6001.7000
    
    WMFSDKNeeded    : 0.0.0.0000
    
    comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
    
    title           : Wildlife in HD
    
    copyright       : © 2008 Microsoft Corporation
    
    IsVBR           : 0
    
    DeviceConformanceTemplate: AP@L3
    
  Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
    
    Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, fltp, 192 kb/s
    
    Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
    
Output #0, rawvideo, to &#39;pipe:&#39;:
    
  Metadata:
    
    SfOriginalFPS   : 299700
    
    WMFSDKVersion   : 11.0.6001.7000
    
    WMFSDKNeeded    : 0.0.0.0000
    
    comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
    
    title           : Wildlife in HD
    
    copyright       : © 2008 Microsoft Corporation
    
    IsVBR           : 0
    
    DeviceConformanceTemplate: AP@L3
    
    encoder         : Lavf55.33.100
    
    Stream #0:0(eng): Video: bmp, bgr24, 1280x720, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
    
Stream mapping:
    
  Stream #0:1 -> #0:0 (vc1 -> bmp)
    
Press [q] to stop, [?] for help
    
frame=    3 fps=0.0 q=0.0 size=    8100kB time=00:00:00.10 bitrate=662902.1kbits/s    
    
frame=   29 fps= 26 q=0.0 size=   78302kB time=00:00:00.96 bitrate=662902.3kbits/s    
    
frame=   50 fps= 30 q=0.0 size=  135003kB time=00:00:01.66 bitrate=662902.2kbits/s    
    
frame=   65 fps= 30 q=0.0 size=  175503kB time=00:00:02.16 bitrate=662902.2kbits/s    
    
frame=   80 fps= 30 q=0.0 size=  216004kB time=00:00:02.66 bitrate=662902.1kbits/s    
    
frame=   95 fps= 30 q=0.0 size=  256505kB time=00:00:03.16 bitrate=662902.1kbits/s    
    
[asf @ 0x600059480] ff asf bad header 74  at:5053733
    
[asf @ 0x600059480] invalid packet_length -1908511255 at:5053740
    
[asf @ 0x600059480] ff asf bad header d4  at:5053759
    
[asf @ 0x600059480] ff asf skip 55629 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5181733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5189733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5197733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5205733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5213733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5221733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5229733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5237733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5245733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5357733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5365733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5373733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5381733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5493733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5501733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5509733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5517733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5629733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5637733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5645733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5653733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5701733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5709733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5717733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5725733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5805733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5813733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5821733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5829733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5877733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5885733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5893733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5901733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5949733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5957733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5965733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] ff asf bad header 0  at:5973733
    
[asf @ 0x600059480] ff asf skip 7991 (unknown stream)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 15 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 2
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 7 times
    
[asf @ 0x600059480] ff asf skip 2562 (unknown stream)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 3 times
    
[asf @ 0x600059480] ff asf skip 448 (unknown stream)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 9 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 6
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 7 times
    
[asf @ 0x600059480] packet_frag_size is invalid (1749-9)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 13 times
    
[asf @ 0x600059480] packet_frag_size is invalid (1749-9)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 24 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 6
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 6 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 5
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 6 times
    
[asf @ 0x600059480] packet_frag_size is invalid (1749-9)
    
[asf @ 0x600059480] packet_obj_size invalid
    
[asf @ 0x600059480] packet_frag_size is invalid (1749-9)
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 2 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 5
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 8 times
    
[asf @ 0x600059480] unexpected packet_replic_size of 5
    
[asf @ 0x600059480] packet_obj_size invalid
    
    Last message repeated 39 times
    
[asf @ 0x600059480] packet_frag_size is invalid (1749-40)

  • How to use a Pipe between two processes in Process.Start

    4 juin 2015, par Zed Machine

    I have to run this command line using VB.NET :

    "H :\videotest\test.vpy" - -y | "H :\Release\data\bin64\ffmpeg.exe" -hwaccel auto -y -i - -map 0:v:0 -c:v libx265 -crf 20.0 -preset 5 -x265-params level=0:profile=undefined:pmode:no-pme:pme:no-high-tier:ref=3:bframes=4:open-gop:keyint=250:min-keyint=25:b-adapt=2:bframe-bias=0:rc-lookahead=20:no-scenecut:b-pyramid:me=hex:subme=2:merange=57:temporal-mvp:weightp:no-weightb:max-merge=2:no-weightb:no-rect:no-amp:vbv-bufsize=0:vbv-maxrate=0:vbv-init=0.9:no-strict-cbr:qcomp=0.6:qstep=4:aq-mode=1:aq-strength=1.0:cutree:no-early-skip:min-cu-size=8:ctu=64:no-fast-cfb:ipratio=1.4:pbratio=1.3:cbqpoffs=0:crqpoffs=0:rd=3:psy-rd=0.3:psy-rdoq=1:no-b-intra:no-fast-intra:rdoq-level=1:no-tskip:no-tskip-fast:cu-lossless:tu-intra-depth=1:tu-inter-depth=1:strong-intra-smoothing:no-constrained-intra:nr-intra=0:nr-inter=0:qblur=0.5:cplxblur=20:signhide:sar=16
    "H :\videotest\outputawdwd.mkv"

    vspipe.exe runs the test.vpy script and applies filters to or resizes video input, then the output is piped to ffmpeg for the encoding.

    If I use a normal Process declaration with vspipe it gives the following error :

    Unknown argument : |

    From the command line the script works well. I suspect that means that I have to manually pipe between vspipe and ffmpeg.

    Is it possible to manually pipe output from one process to another ? Must I do it manually ?

    Here is my function to start process :

    executablepath = "H:\Project\VapourSynth\core64\vspipe.exe"
    

    
params = "H:\videotest\test.vpy" - -y | "H:\Release\data\bin64\ffmpeg.exe" -hwaccel auto -y -i - -map 0:v:0 -c:v libx265 -crf 20.0 -preset 5 -x265-params level=0:profile=undefined:pmode:no-pme:pme:no-high-tier:ref=3:bframes=4:open-gop:keyint=250:min-keyint=25:b-adapt=2:bframe-bias=0:rc-lookahead=20:no-scenecut:b-pyramid:me=hex:subme=2:merange=57:temporal-mvp:weightp:no-weightb:max-merge=2:no-weightb:no-rect:no-amp:vbv-bufsize=0:vbv-maxrate=0:vbv-init=0.9:no-strict-cbr:qcomp=0.6:qstep=4:aq-mode=1:aq-strength=1.0:cutree:no-early-skip:min-cu-size=8:ctu=64:no-fast-cfb:ipratio=1.4:pbratio=1.3:cbqpoffs=0:crqpoffs=0:rd=3:psy-rd=0.3:psy-rdoq=1:no-b-intra:no-fast-intra:rdoq-level=1:no-tskip:no-tskip-fast:cu-lossless:tu-intra-depth=1:tu-inter-depth=1:strong-intra-smoothing:no-constrained-intra:nr-intra=0:nr-inter=0:qblur=0.5:cplxblur=20:signhide:sar=16 "H:\videotest\outputawdwd.mkv"
    

    
Private Sub CreateJobProcess(ByVal Name, ByVal executablepath, ByVal params)
    

    
    Try
    

    
        If Not jobs_processes.ContainsKey(Name) Then
    

    
            Dim Proc As New Process
    

    
            Proc.StartInfo.UseShellExecute = False
    
            Proc.StartInfo.CreateNoWindow = True
    
            Proc.StartInfo.RedirectStandardError = True
    
            Proc.StartInfo.FileName = "" &amp; executablepath &amp; ""
    
            Proc.StartInfo.Arguments = params
    

    
            'start process
    
            Proc.Start()
    

    
            'add new process to dictionary
    
            jobs_processes.Add(Name, Proc)
    

    
            'TEMP
    
            My.Settings.giobbe -= 1
    

    
            'start background workers for statistics
    
            If Not ConversionStats.IsBusy Then
    
                ConversionStats.WorkerSupportsCancellation = True
    
                ConversionStats.RunWorkerAsync()
    
            End If
    

    
            If Not UpdateListJob.IsBusy Then
    
                UpdateListJob.WorkerSupportsCancellation = True
    
                UpdateListJob.RunWorkerAsync()
    
            End If
    

    
        End If
    

    
    Catch ex As Exception
    
        Me.Invoke(New MethodInvoker(Sub() Logbox.AppendText(Environment.NewLine &amp; ">Program exception:" &amp; Environment.NewLine &amp; ex.Message &amp; Environment.NewLine)))
    
        MsgBox(ex.Message)
    
    End Try
    
End Sub

    Update :

    This is the block I have changed, this function get job name and parameters for the job that needs to be created, then it saves the process in a dictionary.

                  Dim Proc As New Process
    

    
                Proc.StartInfo.UseShellExecute = False
    
                Proc.StartInfo.CreateNoWindow = True
    
                Proc.StartInfo.RedirectStandardError = True
    
                Proc.StartInfo.FileName = "cmd"
    
                Proc.StartInfo.Arguments = params
    

    
                'start process
    
                Proc.Start()
    

    
                'add new process to dictionary
    
                jobs_processes.Add(Name, Proc)
    

    
                'TEMP
    
                My.Settings.giobbe -= 1
    

    
                'start background workers for statistics
    
                If Not ConversionStats.IsBusy Then
    
                    ConversionStats.WorkerSupportsCancellation = True
    
                    ConversionStats.RunWorkerAsync()
    
                End If
    

    
                If Not UpdateListJob.IsBusy Then
    
                    UpdateListJob.WorkerSupportsCancellation = True
    
                    UpdateListJob.RunWorkerAsync()
    
                End If

    then i have a backgroundworker ( ConversionStats ) that get stderr from every process in the dictionary and print them into textboxes :

               'take current selected process and set streamreader
    
            Dim tmpproc As Process = jobs_processes(CurrentJob)
    
            Dim ffmpeg_stats As StreamReader
    
            Dim stdoutput As String = ""
    

    
            'something that verify if the job is started 
    

    
            If statejob = 1 Then    'if job is working
    

    
                'take stderr from ffmpeg
    
                ffmpeg_stats = tmpproc.StandardError
    
                stdoutput = ffmpeg_stats.ReadLine()
    

    
                If stdoutput IsNot Nothing Then 'if ffmpeg stderr is not nothing 
    

    
                    'IF FFMPEG IS RETURNING STATS
    
                    If stdoutput.Contains("frame=") Or stdoutput.Contains("size=") Then

    so this is my code...
    but now with cmd getting standarderror with streamreader result in taking a string "Invalid Handle." this is an error from cmd stderr or there is a problem with the streamreader ?

    UPDATE 2

    I have even tried to start a clean cmd process declaring only parameters but the result is just the console with main infos.

    Microsoft Windows [Versione 6.3.9600]
    (c) 2013 Microsoft Corporation. Tutti i diritti riservati.

    H :\Project\bin\Release>

    this is the code to clarify :

                    Dim Proc As New Process
    

    
                Proc.StartInfo.FileName = "cmd"
    
                Proc.StartInfo.Arguments = params
    

    
                'start process
    
                Proc.Start()

    SO AGAIN THERE IS SOMEONE WHO CAN GUIDE ME HOW TO PIPE/REDIRECT STDOUTPUT FROM ONE PROCESS (vspipe.exe) TO THE STDIN OF ANOTHER PROCESS (ffmpeg.exe) ?

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