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• how to call a tcl file from another tcl file

  28 novembre 2017, par M. D. P

  i need to call a tcl file which hold the code for capturing image from another tcl file.

  for example i my image.tcl file code is as follow :

  proc image {}  { 
  
  
  
  set time [clock format [clock seconds] -format %Y%m%d_%H%M%S]
  
     
  
  exec ffmpeg -f dshow -s 1280x720 -i "video=Integrated Webcam" -benchmark c:/test/sample_$time.jpg
  
          
  
  }
  
  image

  so, i want to call this image.tcl file from another tcl file called main.tcl,so the code for main.tcl can be as follow :

  proc a {}  { 
  
  
  
  "c:/test/image.tcl"
  
  
  
  "c:/test/video.tcl" 
  
  
  
  "c:/test/live.tcl"
  
          
  
  }
  
  a

  the above tcl script should run one after another when i call main.tcl

  any solution for this. add the code as answer. thanks.

• Can ffmpeg record more than two audio tracks ? (Linux)

  27 novembre 2017, par Toby Eggitt

  I want to record four microphones, independently but concurrently and on the same clock (so they stay synchronized over long recording periods). I’m accustomed to grabbing two microphones (as left and right channels) using ffmpeg on Linux, and would like to use the same basic approach for the four.

  I believe I’ve found several USB-based devices that will allow sending four multiplexed audio signals, digitized, through a single USB port, but it’s not clear to me how I would capture this data into a single file. I’ve never worked with an audio file containing more than a left and right stereo track. (well, that and a video track, I suppose :)

  Part of the problem is that I can’t "just try it", since I don’t want to buy the non-trivially-priced device if it’s not going to be usable.

  Does anyone know if this is possible ? If so, does it "just work" when ffmpeg sees such a data stream, or is there some config I need to do (and if so, any hints on what, or where to find the information, would be most welcome).

  TIA !

• ffplay 461 Unsupported transport

  28 octobre 2017, par Cerato

  Please help me to understand what I am doing wrong.

  I am executing the following command for making a live stream

  Executing: powershell gst-launch-1.0 filesrc location=D:/testVODs/sample.mkv ! matroskademux name=dmx dmx. ! h264parse config-interval=1 ! queue ! rtspclientsink profiles=avpf protocols=udp location="rtsp://192.168.1.1:8554/8c83bea4-b49b-4776-9c0f-d11e9e8898f0/1" name=rtsp_out dmx. ! opusparse ! queue ! rtsp_out.

  and in the result, I see that the execution ended after 00:01:21 which means that the stream is ended successfully after my video ended :

  Setting pipeline to PAUSED ...
  
  Pipeline is PREROLLING ...
  
  Progress: (open) Opening Stream
  
  Progress: (connect) Connecting to rtsp://192.168.1.1:8554/8c83bea4-b49b-4776-9c0f-d11e9e8898f0/1
  
  Progress: (open) Retrieving server options
  
  Progress: (open) Opened Stream
  
  Pipeline is PREROLLED ...
  
  Setting pipeline to PLAYING ...
  
  New clock: GstSystemClock
  
  Progress: (request) Sending RECORD request
  
  Progress: (record) Sending server stream info
  
  Progress: (request) Sending RECORD request
  
  Progress: (request) SETUP stream 1
  
  Progress: (request) SETUP stream 0
  
  Progress: (record) Starting recording
  
  Got EOS from element "pipeline0".
  
  Execution ended after 0:01:21.318315052
  
  Setting pipeline to PAUSED ...
  
  Setting pipeline to READY ...
  
  Setting pipeline to NULL ...
  
  Freeing pipeline ...

  at the same time I am trying to play the stream using the following request :

  Executing: powershell ffplay -rtsp_transport http "rtsp://192.168.1.1:8554/live/8c83bea4-b49b-4776-9c0f-d11e9e8898f0/1"

  but I have the following response :

  ffplay started on 2017-10-27 at 18:52:13
  
  Report written to "D:/testVODs/Stream1to.log"
  
  ffplay version 3.4 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --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      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
  [rtsp @ 000001930a05e500] method SETUP failed: 461 Unsupported transport
  
  rtsp://192.168.1.1:8554/live/8c83bea4-b49b-4776-9c0f-d11e9e8898f0/1: Unknown error

  why method SETUP failed as 461 Unsupported transport and how it can be solved ?

  I tried to use different ffplay, ffmpeg commands, but all of them lead to the same result.
  If I do not use rtsp_trasport command I have the error [udp @ 000001d1ab52c300] ’circular_buffer_size’ option was set but it is not supported on this build (pthread support is required)
  and the same 461 Unsupported transport

  Before I added "profiles=avpf" to my stream creation request I managed to play it successfully with "rtsp_transport tcp".
  But now profiles=avpf is required and I need to understand how to deal with it