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• Using Windows named pipes with ffmpeg pipes (Doesnt work)

  25 octobre 2019, par Estr

  I’m trying to send audio and video RAW through c# pipes to FFMPEG, I’ve been reading and trying to follow what’s shown here : https://docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeserverstream?view=netframework-4.8

  This a fragment of the code...

          NamedPipeServerStream p_1;
  
          NamedPipeServerStream p_2;
  
          p_1 = new NamedPipeServerStream("p_1", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
          p_2 = new NamedPipeServerStream("p_2", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
          p_1.WaitForConnection();
  
  
  
          p_2.WaitForConnection();

  .......

  I run this command in FFMPEG : ffmpeg.exe -i \.\pipe\p_1 -vcodec hevc -r 8 -f alaw -ar:a 16000 -ac:a 1 -i \.\pipe\p_2 o.mp4

  But the program stays on the line : p_2.WaitForConnection() ;

  How can I solve it ?

• ERROR : Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

  13 octobre 2019, par timofischerprojects

  I want to replace the audio stream in a Video-DVD. But I have problems with the replace of the audio stream.

  The DVD-VOB have 3 streams.
  Stream 0 is dvd_nav_packet.
  Stream 1 is the video.
  Stream 2 is the audio.

  I also tryed to change the exportinformation for ffmepg with -map 0:d and -map 0:d:1. Also with and without from the codec Infos -f vob -target ntsc-dvd -vcodec copy -acodec copy. And update ffmpeag/use older versions. But I only get error messages.

  ffmpeg is startet with a vb.net Programm which which decide which video need a new audio file.

  Can somebody tell me what I do wrong ?

  ffmpeg.exe -i "F:\VIDEO_TS\VTS_01_1.VOB" -i "%CD%\tfpat.mp2" -map 0:0 -map 0:1 -map 1:0 -f vob -target ntsc-dvd -vcodec copy -acodec copy "C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB"
  
  
  
  
  
  ffmpeg version N-88514-gd5995c531d Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  1.100 / 58.  1.100
  
    libavformat    58.  0.102 / 58.  0.102
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  0.101 /  7.  0.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mpeg, from 'F:\VIDEO_TS\VTS_01_1.VOB':
  
    Duration: 00:01:51.17, start: 0.300300, bitrate: 7273 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet
  
      Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 [SAR 32:27 DAR 16:9], 6800 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Stream #0:2[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  [ac3 @ 037ee700] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, ac3, from 'D:\SkyDrive\Projekte\AtmosFX_Syncro_Projekt\AtmosFX-Translator\AlteVersionen\Version 2\tfpat.mp2':
  
    Duration: 00:01:51.26, start: 0.000000, bitrate: 320 kb/s
  
      Stream #1:0: Audio: ac3, 48000 Hz, stereo, fltp, 320 kb/s
  
  File 'C:\Users\Timo\AppData\Local\Microsoft\Windows\Burn\Burn\VIDEO_TS\VTS_01_1.VOB' already exists. Overwrite ? [y/N] y
  
  [dvd @ 037fbd20] Invalid media type data for output stream #0
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (copy)
  
      Last message repeated 1 times

• why cmd just print command and dosen't work ?

  11 octobre 2019, par 杨士弘

  I tried create a website that could upload mp4 then my server would transcode it to ts and create a m3u8 playlist。
  I wanted to use cmd to control ffmpeg to do this，and I use visual basic to do this.

  Here is my code：

    Dim fileName As String = "borderoflife"
  
    Dim file As String = "borderoflife.mp4"
  
    Dim appPath As String = "C:\allen0916\"
  
    Dim saveDir As String = "test2\"
  
  
  
    Dim savePath As String = appPath & saveDir
  
    Dim saveResult As String = savePath & file
  
  
  
    Dim Content_Type_A As String = "video/mp4"
  
  
  
    Dim m3u8Path As String = Path.Combine(savePath, fileName + ".m3u8")
  
    Dim para As String = String.Format("/C ffmpeg -i {0} -profile:v baseline -level 3.0 -s 640x360 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls {1} ", saveResult, m3u8Path)
  
  
  
    Dim output As String = "none" 
  
    Dim p As Process = New Process()
  
  
  
    p.StartInfo.FileName = "cmd.exe"
  
    p.StartInfo.UseShellExecute = False 
  
    p.StartInfo.RedirectStandardInput = True 
  
    p.StartInfo.RedirectStandardOutput = True 
  
    p.StartInfo.RedirectStandardError = True 
  
    p.StartInfo.CreateNoWindow = True 
  
    p.Start()
  
    p.StandardInput.WriteLine(para) 
  
    p.StandardInput.WriteLine("exit")
  
    p.StandardInput.AutoFlush = True
  
    p.StandardInput.Close() 
  
    output = p.StandardOutput.ReadToEnd() 
  
    p.WaitForExit()
  
    p.Close()
  
  
  
   If System.IO.File.Exists(m3u8Path) <> True Then
  
        context.Response.Write(output)
  
    Else
  
        context.Response.Write("Success")
  
    End If  

  and every time output just returns ：

  Microsoft Windows [version 10.0.17763.737]
  
  (c) 2018 Microsoft Corporation. 
  
  
  
  c:\windows\system32\inetsrv>/C ffmpeg -i C:\allen0916\test2\borderoflife.mp4 -profile:v baseline -level 3.0 -s 640x360 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls C:\allen0916\test2\borderoflife.m3u8 
  
  
  
  c:\windows\system32\inetsrv>exit

  it seems cmd.exe just print my command and not working，
  Dose somebody know why？