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• FFMPEG add text frames to the start of video

  12 février 2016, par Ryan

  I have some videos either in mp4 or webm format, and I’d like to use ffmpeg to add 4 seconds to the start of each video to display some text in the center with no sound.

  Some other requirements :

  • try to avoid re-encoding the video
  • need to maintain the quality (resolution, bitrate, etc)
  • (optional) to make the text fade in/out

  I am new to ffmpeg and any help will be appreciated.

  thanks in advance

  Example ffprobe information for mp4 below :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.33.100
  
    Duration: 00:00:03.84, start: 0.042667, bitrate: 1117 kb/s
  
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 1021 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 140 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  Example webm

  Input #0, matroska,webm, from 'input.webm':
  
    Metadata:
  
    encoder         : Lavf55.33.100
  
   Duration: 00:00:03.80, start: 0.000000, bitrate: 1060 kb/s
  
     Stream #0:0(eng): Video: vp8, yuv420p, 1280x720, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  
     Stream #0:1(eng): Audio: vorbis, 48000 Hz, stereo, fltp (default)

  Screenshot from joined.mp4

  Screenshot for step 3 console

• ffmpeg : fix implementation of updated input start time

  21 octobre 2022, par Gyan Doshi

  ffmpeg : fix implementation of updated input start time
  The current adjustment of input start times just adjusts the tsoffset.
  
  And it does so, by resetting the tsoffset to nullify the new start time.
  
  This leads to breakage of -copyts, ignoring of input_ts_offset, breaking
  
  of -isync as well as breaking wrap correction.
  Fixed by taking cognizance of these parameters, and by correcting start times
  
  just before sync offsets are applied.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_demux.c
  • [DH] fftools/ffmpeg_opt.c

• 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) ?