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• 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 = "" & executablepath & ""
  
              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 & ">Program exception:" & Environment.NewLine & ex.Message & 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) ?

• avutil/pixfmt : add XV48 pixel format

  23 octobre 2024, par James Almer

  avutil/pixfmt : add XV48 pixel format
  Much like XV30 and XV36 in d75c4693fef51e8f0a1b88798530f4c5147ea906,
  
  XV48 is added to support 16bit 4:4:4 as defined by Microsoft.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] doc/APIchanges
  • [DH] libavutil/pixdesc.c
  • [DH] libavutil/pixfmt.h
  • [DH] libavutil/tests/pixfmt_best.c
  • [DH] libavutil/version.h
  • [DH] tests/ref/fate/imgutils
  • [DH] tests/ref/fate/pixfmt_best
  • [DH] tests/ref/fate/sws-pixdesc-query

• avformat/mov : Only read the primary item for AVIF

  28 juin 2022, par Vignesh Venkatasubramanian

  avformat/mov : Only read the primary item for AVIF
  Update the still AVIF parser to only read the primary item. With this
  
  patch, AVIF still images with exif/icc/alpha channel will no longer
  
  fail to parse.
  For example, this patch enables parsing of files in :
  
  https://github.com/AOMediaCodec/av1-avif/tree/master/testFiles/Microsoft
  Adding two fate tests :
  
  1) demuxing of still image with 1 item - this test will pass regardless
  
     of this patch.
  
  2) demuxing of still image with 2 items - this test will fail without
  
     this patch and will pass with patch applied.
  Partially fixes trac ticket #7621
  Signed-off-by : Vignesh Venkatasubramanian <vigneshv@google.com>
  
  Signed-off-by : James Zern <jzern@google.com>
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c
  • [DH] tests/fate/mov.mak
  • [DH] tests/ref/fate/mov-avif-demux-still-image-1-item
  • [DH] tests/ref/fate/mov-avif-demux-still-image-multiple-items