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• How can I send a virtual camera to Genymotion or Android Studio Emulator in Ubuntu ?

  4 décembre 2020, par ykasur

  I created a virtual camera using v4l2loopback and ffmpeg. The command I use for ffmpeg is :
ffmpeg -re -l oop 1 -i vin.png -vf format=yuv420p -f v4l2 /dev/video2

  


  vin.png is the image I want to stream to the webcam and /dev/video2 is the virtual webcam I created with v4l2loopback.
The virtual webcam works and I can see it e.g. with onlinemicetest.com/webcam-test.
I'm using the Genymotion emulator with the newest Android API (I tried 7.0, 8.1 and 10.0) on Ubuntu 20.40.
Genymotion detects the virtual camera but only displays a dummy image :
Wrong dummy Image from Genymotion
I also tried (and would prefer to use) the android studio emulator. But I can only select Webcam0 in the configuration of the device camera and that points to the real integrated camera and not to my virtual webcam.

  


  I don't need to use ffmpeg, but I do need to use a tool that lets me control which image to stream from the command line.

  


  Is there a way to solve this ? Many thanks in advance !

  


  Update 17.11.2020 :
The Genymotion support answered me, that they plan to support virtual cameras in the future. They might be ready to add this in mid 2021.

  


• Why ffmpeg can play h264 even when flag —disable-libx264 is set ? [closed]

  2 décembre 2020, par Jams

  To be complient with x264 licensing (for a commercial software I'm making) I plan to use a compiled version of ffmpeg without x264 support.
Here is the ouput of the command line ffmpeg -L :

  


  


  ffmpeg version n4.3.1-20-g8a2acdc6da Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3-win32 (GCC) 20200320
configuration : —prefix=/ffbuild/prefix —pkg-config-flags=—static —pkg-config=pkg-config —cross-prefix=x86_64-w64-mingw32- —arch=x86_64 —target-os=mingw32 —enable-version3 —disable-debug —enable-shared —disable-static —disable-debug —enable-iconv —enable-zlib —enable-libxml2 —enable-libfreetype —enable-libfribidi —enable-gmp —enable-lzma —enable-fontconfig —enable-opencl —enable-libvmaf —disable-vulkan —enable-libvorbis —enable-amf —enable-libaom —disable-avisynth —enable-libdav1d —disable-libdavs2 —enable-ffnvcodec —enable-cuda-llvm —disable-libglslang —enable-libass —enable-libbluray —enable-libmp3lame —enable-libopus —enable-libtheora —enable-libvpx —enable-libwebp —enable-libmfx —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-librav1e —enable-schannel —enable-sdl2 —enable-libsoxr —enable-libsrt —enable-libtwolame —disable-libvidstab —disable-libx264 —disable-libx265 —disable-libxavs2 —disable-libxvid —enable-libzimg —extra-cflags=-DLIBTWOLAME_STATIC —extra-cxxflags= —extra-ldflags=-pthread —extra-libs=-lgomp
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
ffmpeg is free software ; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation ; either version 3 of the License, or
(at your option) any later version.

  


  


  But when I play a video encoded with h264 it plays perfectly.
Is expected ? How to be sure I'm not infringing the license ?

  


  Here is where I downloaded the binaries :
https://github.com/BtbN/FFmpeg-Builds/releases
  
And I picked a release with the following name : win64-gpl-shared-4.3.zip

  


  Thanks.

  


• How to run a bat file when clicking a button in an electron + react application ?

  12 novembre 2020, par Артем

  I am using Windows 7
  
I want to write a windows app using electron + react.
  
The essence of the application is to run bat files.
  
Bat files will execute their script.
  
In this case, I have already written baht files, they work with the FFMPEG.
  
I like FFMPEG and I would like to make it easy to use on Windows with such an application.
  
At this stage, I have two folders Your_files and Result, next to these folders are ready-made baht files and ffmpeg.exe.
  

  


  

  1. In the folder Your_files I put the files to convert.
     

  


  2. I click on the desired baht file, it converts.
     

  


  3. I take the finished files from the Result folder.
     

  


  


  I would like to write a nice application now.
  
There will be one window with buttons in the CMD style - minimalism. On the buttons, the labels are similar (mp4 - mkv) and others.
  
I also plan to place two folders Your_files and Result next to the application.
  
The principle is the same, only here is a beautiful visual interface with buttons for the place of many baht files.
  
It will be easier to visually choose what you need.
  
The crux of the question : How to launch a baht file when you click on a button in the application ?
  Perhaps you have some ideas on how to implement this even better .. I welcome your suggestions with a detailed description.
  
------------------------
  
P.S. I originally planned the following... But I decided to abandon this implementation. ))
  
I recorded a cycle in a baht file.
  
The cycle was launched in the bat file mshta.exe with HTML layout (visual interface). lol
  
Received the value of a variable, which he entered in the visual interface of the mshta.exe window.
  
The variable returned to the loop and the baht file was executed.
  
But I don't think this is the best approach. Use a similar hybrid.
  
Take a look at this for fun.
  

  


  &#xA;&#xA;&#xA;&#xA;&#xA;&#xA;    &#xA;    &#xA;    &#xA;    &#xA;    <code class="echappe-js">&lt;script type=&quot;text/javascript&quot;&gt;&amp;#xA;        function myFunction() {&amp;#xA;            var copyText = document.getElementById(&quot;myInput&quot;);&amp;#xA;            copyText.select();&amp;#xA;            document.execCommand(&quot;copy&quot;);&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;&#xA;&#xA;    &lt;script language=&amp;#x27;javascript&amp;#x27;&gt;&amp;#xA;        window.resizeTo(800, 300);&amp;#xA;&amp;#xA;        function entperPressed(e) {&amp;#xA;            if (e.keyCode == 13) {&amp;#xA;                pipePass();&amp;#xA;            }&amp;#xA;        }&amp;#xA;&amp;#xA;        function pipePass() {&amp;#xA;            var pass = document.getElementById(&amp;#x27;pass&amp;#x27;).value;&amp;#xA;            var fso = new ActiveXObject(&amp;#x27;Scripting.FileSystemObject&amp;#x27;).GetStandardStream(1);&amp;#xA;            close(fso.Write(pass));&amp;#xA;&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;    
  Enter time of frame. Введите время кадра
  &#xA;    
  
  hh:mm:ss.mss – 00:00:00.000
  &#xA;
  (colons can be omitted as well as milliseconds)
  &#xA;
  (двоеточия при вводе можно опустить как и миллисекунды)
  &#xA;
  &#xA;        &#xA;        Okey
  &#xA;
  
  &#xA;
  &#xA;        Copy
  &#xA;        &#xA;
  
  &#xA;&#xA;&#xA;&#xA;
  

  


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