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• Unable to build solution in Visual Studio 2019 : The BaseOutputPath/OutputPath property is not set for project

  23 juillet 2022, par mhadi

  In an effort to integrate FFmpeg with Unity, I have been trying to build a solution file in Visual Studio 2019. However, I am currently unable to resolve the following error when I try to build in Visual Studio :

  


  


  The BaseOutputPath/OutputPath property is not set for project
'FFmpegUnityInterop.vcxproj'. Please check to make sure that you have
specified a valid combination of Configuration and Platform for this
project. Configuration='Release' Platform='x64'. This error may
also appear if some other project is trying to follow a
project-to-project reference to this project, this project has been
unloaded or is not included in the solution, and the referencing
project does not build using the same or an equivalent Configuration
or Platform.

  


  


  I have tried a number of solutions, including :

  


  

  1. Manually adding the OutputPath in 'FFmpegUnityInterop.vcxproj'
<outputpath>bin/Build/</outputpath>.

  


  2. In the FFmpegUnityInterop.vcxproj file, moving the ProjectProperty with my preferred configuration and platform combination to the very top of the list of ProjectProperties (there are 8 of them).

  


  3. Building with different configuration and platforms.

  


  4. Trying to build from VS Dev Command prompt using the following command :
MSbuild.exe "FFmpegUnityInterop.sln" /p:Configuration=Release /p:Platform="x64", as well as from the Visual Studio IDE.

  


  5. Tried setting the OutputPath in the command line command
(>MSbuild.exe FFmpegUnityInterop.sln /p:Configuration=Release /p:Platform="AnyCPU" /p:OutputPath = bin\Debug), only to have
MSbuild throw error MSB1008 (MSBUILD : error MSB1008 : Only one
project can be specified.)

  


  6. Setting the configuration and platform manually in the Configuration Manager GUI in
Visual Studio.

  


  


  I may have missed an attempted solution or two above, but I've tried most of the suggestions I found online, only to get the error pasted above. Part of me suspects that my compilation of FFmpeg libraries didn't execute fully, but I unfortunately do not have enough experience to verify that. Any suggestions to resolve this would be much appreciated.

  


  PS. The project was developed privately by a private entity that is currently unreachable

  


• Build a C++ project with OpenCV 4.5.x in Visual Studio with custom flags for ffmpeg

  18 mai 2022, par Ivy Growing

  Our C++ project in MS Visual Studio under Windows 10 uses OpenCV 4.5.

  


  #include <opencv2></opencv2>opencv.hpp>&#xA;#include <opencv2></opencv2>videoio.hpp>&#xA;#include <opencv2></opencv2>imgcodecs.hpp>&#xA;#include "opencv2/highgui/highgui.hpp"&#xA;#include "opencv2/core/core.hpp"&#xA;

  


  The project works well. The OpenCV uses ffmpeg as dependency for extracting video frames from a stream or a file. Our legals require following flags are not used when compiling the ffmpeg to approve the product release :

  


  

  • without --enable-gpl

  


  • without --enable-nonfree

  


  


  So far this page gets close to the answer, however, I cannot understand how to configure the Visual Studio to use custom flags just for ffmpeg and not for other dependencies. Elaboration is appreciated.

  


  The Visual Studio has challenging and pretty confusing (for me in person, often) menues and settings. This is the root of the question :

  


  How/where in Visual Studio can I see which flags are used for compiling of dependent libraries ?
Specifically, how can I check which flags are used in OpenCV to build the ffmpeg ?

  


• ffmpeg output always has frozen parts of the output mp4

  5 mai 2022, par bein

  So a little clarification i have a folder of videos that i want to combine into one. Ive looked at multiple overflows and everything i try ends up with an error. The first few videos work then on the later ones its just frozen. I can still however hear the audio. I currently have this as my video.js...

  


  import { exec } from 'child_process';
import * as fs from 'fs';

let folders = fs.readdirSync('./videos')


folders.forEach(element => {
    if(element != '.DS_Store'){
        let videos = fs.readdirSync('./videos/'+element)

        fs.writeFileSync('./videos/'+element+'/list.txt','')
        
        try {
            fs.rmSync('./videos/'+element+'/combined.mp4')
        } catch (error) {
            //console.log(error)
        }

        let list = ''
        
        videos.forEach(video => {
            if(video != 'list.txt' && video != '.DS_Store' && video != 'combined.mp4'){
                fs.appendFileSync('./videos/'+element+'/list.txt',('file '+video+'\n'))


                list += `file ${video}`
                list += "\n"




            
            }
        });

        var writeStream = fs.createWriteStream('./videos/'+element+'/list.txt')

        writeStream.write(list)

        writeStream.end()


        exec(`ffmpeg -hwaccel d3d11va -safe 0 -ss 0 -f concat -i  ${'./videos/'+element+'/list.txt'}  -c copy -copyinkf -vsync 1 -s 1920x1080 -sws_flags lanczos -c:v h264 ${'./videos/'+element+'/combined.mp4'}`, {maxBuffer: 1024 * 100000},(error, stdout, stderr) => {
            if (error) {
                console.log(`error: ${error.message}`);
                return;
            }
            else{
                console.log("videos are successfully merged")
        }
            
        })
    }
});


  


  Any Ideas ? Tried both on Mac and Windows