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• FFMPEG. Combine rawAudio and rawVideo from named pipe

  13 août 2018, par user3882856

  I have 2 NamedPipeServerStreams. 1 for Audio (Stereo Mix). I am using WavIn from NAudio and 1 for Video (Screen Capture). Just converting BitBlt screen to Byte Array.

  I’m able to create an mp4 video for the rawvideo and changing code, a seperate wav for the rawaudio but am unable to combine/merge both into an mp4 video.

  These are the ffmpeg commands i’m using.

  To create the audio wav file :

  string args = @"-f s32le -channels 2 -sample_rate 44100 -i \\.\pipe\ffpipea -c copy output.wav";

  Audio plays really fast but it at least gets it.

  To create the video mp4 file :

  string inputArgs = @"-framerate 8 -f rawvideo -pix_fmt bgr24 -video_size 1920x1080 -i \\.\pipe\ffpipev";
  
  string outputArgs = "-vcodec libx264 -crf 23 -pix_fmt yuv420p -preset ultrafast -r 8 output.mp4";

  My attempt to combine/merge both :

  string args = @"-framerate 8 -f rawvideo -pix_fmt bgr24 -video_size 1920x1080 -i \\.\pipe\ffpipev " +
  
          @"-f s32le -channels 2 -sample_rate 44100 -i \\.\pipe\ffpipea " +
  
          "-map 0:0 -map 1:0 -vcodec libx264 -crf 23 -pix_fmt yuv420p -preset ultrafast -r 8 -c:a copy output.mp4";

  Depending on what i change in the args, either the WaitForConnection() never fires or the audiopipe breaks with pip is broken.

  Please let me know if i can provide further information. Any help greatly appreciated.

• ffmpeg pipe output and script [duplicate]

  27 juillet 2018, par James Magnus

  This question already has an answer here :

  • Execute command in a variable don’t execute the latter part of a pipe
    
    1 answer
    

  I need to extract raw video and pipe it to another program. This runs perfectly in a terminal :

  ffmpeg -i SampleVideo_1280x720_5mb.mp4 -s 1920x1080 -c:v rawvideo -pix_fmt yuv420p -f rawvideo - | ffplay -f rawvideo -pix_fmt yuv420p -s 1920x1080 -

  But when I try to run this command from a script it fails. Here is a very simplified version of the script :

  #!/bin/bash
  
  
  
  c='ffmpeg -i SampleVideo_1280x720_5mb.mp4 -s 1920x1080 -c:v rawvideo -pix_fmt yuv420p -f rawvideo - | ffplay -f rawvideo -pix_fmt yuv420p -s 1920x1080 -'
  
  $c

  The output

  ~/ets/videos$ ./test.sh 
  
  ffmpeg version N-91403-gd24c9e5 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
    configuration: --extra-cflags='-fPIC -I/home/jlbeaussart/ffmpeg_build/include' --extra-ldflags=-L/home/jlbeaussart/ffmpeg_build/lib --extra-libs='-lpthread -lm' --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-shared --enable-libcaca --enable-libxvid --enable-libxml2 --enable-opencl --enable-opengl --enable-cuvid --enable-ffnvcodec --enable-libdrm --enable-nvenc --enable-nvdec --enable-vaapi --enable-vdpau --enable-nonfree
  
    libavutil      56. 18.102 / 56. 18.102
  
    libavcodec     58. 20.104 / 58. 20.104
  
    libavformat    58. 17.101 / 58. 17.101
  
    libavdevice    58.  4.101 / 58.  4.101
  
    libavfilter     7. 25.100 /  7. 25.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SampleVideo_1280x720_5mb.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01T00:00:00.000000Z
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:29.57, start: 0.000000, bitrate: 1421 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1032 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  [NULL @ 0x18d5d40] Unable to find a suitable output format for '|'
  
  |: Invalid argument

• How to make ffmpeg write its output to a named pipe

  14 juillet 2018, par Bastian35022

  I know i can make ffmpeg put its output to stdout and stderr using pipe:1 and pipe:2, respectively, as output_file parameter. (Docs)

  But what about named pipes, can i make it write to one ?

  If not, is there a way to redirect the data in stdout to a named pipe in Linux ? (something like ffmpeg <parameters> | pipe123</parameters>)

  This question is a follow-up of this question.