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• x86 32 bit support for Accord.video.FFMPEG

  1er mars 2021, par Ravi Kanth

  Accord version 3.8.2

  


  I am using Accord, Accord.video, Accord.video.FFMPEG Dll's for capturing the screen, my code is compiled to ANYCPU, everything works fine in 64 bit machine, but I am facing issue when it comes to 32 bit machine below is exception which I am getting.

  


  Exception occurred while loading the assemblies Could not load file or assembly 'Accord.Video.FFMPEG.dll' or one of its dependencies.  is not a valid Win32 application. (Exception from HRESULT: 0x800700C1),    at System.Reflection.RuntimeAssembly.nLoadFile(String path, Evidence evidence)
   at System.Reflection.Assembly.LoadFile(String path)
   at ProHance.ProbeTray.Program.MPvcUlyJUg(Object  , ResolveEventArgs  )


  


• Can't link FFMPEG dynamically to VS 2019 project

  10 février 2021, par Maya Sela

  I downloaded the source code of FFMPEG 3.4.8 and built with MSVC as such :
  
After unzipping, open x86_x64 Cross Tools Command Prompt for VS 2019 and run msys2_shell.cmd. From there, run
  
./configure --toolchain=msvc --arch=x86_64 --enable-yasm --enable-asm --enable-shared --disable-static
and
make

  
I then created a new project in VS 2019.
  
In Properties > C/C++ > General > Additional Include Directories :
  
(Where all the headers are)

  


  E:\ffmpeg-3.4.8\libavutil
E:\ffmpeg-3.4.8\libavcodec
E:\ffmpeg-3.4.8\libavdevice
E:\ffmpeg-3.4.8\libavfilter
E:\ffmpeg-3.4.8\libavresample
E:\ffmpeg-3.4.8\libpostproc
E:\ffmpeg-3.4.8\libswscale
E:\ffmpeg-3.4.8\libswresample
E:\ffmpeg-3.4.8\libavformat


  


  In Properties > Linker > General > Additional Library Directories :
  
(Where the .lib files are)

  


  E:\ffmpeg-3.4.8\libavutil
E:\ffmpeg-3.4.8\libavcodec
E:\ffmpeg-3.4.8\libavdevice
E:\ffmpeg-3.4.8\libavfilter
E:\ffmpeg-3.4.8\libavresample
E:\ffmpeg-3.4.8\libpostproc
E:\ffmpeg-3.4.8\libswscale
E:\ffmpeg-3.4.8\libswresample
E:\ffmpeg-3.4.8\libavformat


  


  In Properties > Linker > Input > Additional Dependencies :

  


  avcodec.lib
avdevice.lib
avfilter.lib
avformat.lib
swresample.lib
swscale.lib


  


  For good measure, I copied the .dll files of each library to the Release folder of the project. There is one source file I am trying to build and run :

  


  &#xA;extern "C" {&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;int main() {&#xA;    AVFormatContext* pFormatContext = avformat_alloc_context();&#xA;}&#xA;

  


  The result is as follows :

  


  1>------ Build started: Project: FFMPEG_example, Configuration: Release x64 ------
1>Source.cpp
1>Source.obj : error LNK2001: unresolved external symbol avformat_alloc_context
1>C:\Users\maya.s\source\repos\FFMPEG_example\x64\Release\FFMPEG_example.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "FFMPEG_example.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


  


  Does anyone have an idea ?
  
Thanks !

  


• How to make VideoCodec.Raw with Accord.Video.FFMPEG ?

  13 décembre 2020, par ryanm8227

  I have succeeded with VideoCodec.MPEG4 but unfortunately, the video quality is terrible :

  


  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Accord.Video.FFMPEG;

namespace Screen_Recorder
{
    public partial class Form1 : Form
    {
        Timer timer1 = new Timer();
        VideoFileWriter vf = new VideoFileWriter();

        System.Random r = new System.Random();

        long rnd(double a, double b)
        {
            return Convert.ToInt64(a + r.NextDouble() * (b - a));
        }

        public Form1()
        {
            InitializeComponent();
            timer1.Interval = 10;
            timer1.Tick += Timer1_Tick;

            vf.Open(Convert.ToString(rnd(9999999999999999, 1000000000000000)) + ".mp4", 1920, 1080, 25, VideoCodec.MPEG4, 1000000);
            
        }

        private void Timer1_Tick(object sender, EventArgs e)
        {
            Bitmap bp = new Bitmap(1920, 1080);
            Graphics gr = Graphics.FromImage(bp);
            gr.CopyFromScreen(0, 0, 0, 0, new Size(bp.Width, bp.Height));

            pictureBox1.Image = bp;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

            vf.WriteVideoFrame(bp);
        }

        private void buttonStartRecording_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void buttonStopRecording_Click(object sender, EventArgs e)
        {
            timer1.Stop();
            vf.Close();
        }
    }
}


  


  That being said, I would like to try making the video without the MPEG4, but with RAW, which is simply a non-compressed video. I expect the size to be pretty big, but that is not an issue.