Extracting images from a video:

ffmpeg -i input.mp4 -r {frames/second} -s {WxH} -f image2 out-%06d.jpeg

1분당 1장, HD(1280x720) 크기로 이미지 추출:

ffmpeg -i input.mp4 -r 1/60 -s 1280x720 -f image2 out-%06d.jpeg

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원문: https://docs.microsoft.com/en-us/archive/msdn-magazine/2018/january/csharp-all-about-span-exploring-a-new-net-mainstay

 

C# - All About Span: Exploring a New .NET Mainstay

01/04/2019 23 minutes to read In this article --> January 2018 Volume 33 Number 1 [C#] All About Span: Exploring a New .NET Mainstay By Stephen Toub | January 2018 This article has been updated to reflect technical changes following its publication. Imagin

docs.microsoft.com

 

From To Mechanism
ArraySegment<T> Memory<T> Implicit cast, AsMemory method
ReadOnlyMemory<T> Implicit cast, AsMemory method
ReadOnlySpan<T> Implicit cast, AsSpan method
Span<T> Implicit cast, AsSpan method
T[] Array property
Memory<T> ArraySegment<T> MemoryMarshal.TryGetArray method
ReadOnlyMemory<T> Implicit cast, AsMemory method
Span<T> Span property
ReadOnlyMemory<T> ArraySegment<T> MemoryMarshal.TryGetArray method
ReadOnlySpan<T> Span property
ReadOnlySpan<T> ref readonly T Indexer get accessor, marshaling methods
Span<T> ReadOnlySpan<T> Implicit cast, AsSpan method
ref T Indexer get accessor, marshaling methods
String ReadOnlyMemory<char> AsMemory method
ReadOnlySpan<char> Implicit cast, AsSpan method
T[] ArraySegment<T> Ctor, Implicit cast
Memory<T> Ctor, Implicit cast, AsMemory method
ReadOnlyMemory<T> Ctor, Implicit cast, AsMemory method
ReadOnlySpan<T> Ctor, Implicit cast, AsSpan method
Span<T> Ctor, Implicit cast, AsSpan method
void* ReadOnlySpan<T> Ctor
Span<T> Ctor

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SDK 버전 확인

Visual Studio Menu > View > Terminal

PS D:\Dev> dotnet --list-sdks
3.1.404 [C:\Program Files\dotnet\sdk]
5.0.100 [C:\Program Files\dotnet\sdk]
5.0.400 [C:\Program Files\dotnet\sdk]

런타임 버전 확인

PS D:\Dev\ETRI\ActiveEMSv2> dotnet --list-runtimes
Microsoft.AspNetCore.All 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

 

PS D:\Dev\MyProject> dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   3.1.404
 Commit:    470f6754b3

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19042
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\3.1.404\

Host (useful for support):
  Version: 5.0.9
  Commit:  208e377a53

.NET SDKs installed:
  3.1.404 [C:\Program Files\dotnet\sdk]
  5.0.100 [C:\Program Files\dotnet\sdk]
  5.0.400 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

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SDK 스타일 프로젝트의 대상 프레임워크 - .NET

.NET 앱 및 라이브러리의 대상 프레임워크에 대해 알아봅니다.

docs.microsoft.com

최신 버전

대상 프레임워크 최신안정적인 버전 TFM 구현된.NET Standard 버전
.NET 5 5.0 net5.0 해당 없음
.NET Standard 2.1 netstandard2.1 해당 없음
.NET Core 3.1 netcoreapp3.1 2.1
.NET Framework 4.8 net48 2.0

지원되는 대상 프레임워크

대상 프레임워크 TFM
.NET 5 이상(및 .NET Core) netcoreapp1.0
netcoreapp1.1
netcoreapp2.0
netcoreapp2.1
netcoreapp2.2
netcoreapp3.0
netcoreapp3.1
net5.0
net6.0
.NET 표준 netstandard1.0
netstandard1.1
netstandard1.2
netstandard1.3
netstandard1.4
netstandard1.5
netstandard1.6
netstandard2.0
netstandard2.1
.NET Framework net11
net20
net35
net40
net403
net45
net451
net452
net46
net461
net462
net47
net471
net472
net48
Windows 스토어 netcore [netcore45]
netcore45 [win] [win8]
netcore451 [win81]
.NET Micro Framework netmf
Silverlight sl4
sl5
Windows Phone wp [wp7]
wp7
wp75
wp8
wp81
wpa81
유니버설 Windows 플랫폼 uap [uap10.0]
uap10.0 [win10] [netcore50]

.NET 5+ OS별 TFM

TFM 호환 가능
net5.0 net1..4(NU1701 경고 포함)
netcoreapp1..3.1(WinForms 또는 WPF가 참조되는 경우 경고)
netstandard1..2.1
net5.0-windows netcoreapp1..3.1(net5.0에서 상속되는 다른 모든 항목 포함)
net6.0 (net5.0의 후속 버전)
net6.0-android xamarin.android(+net6.0에서 상속된 다른 모든 항목)
net6.0-ios xamarin.ios(+net6.0에서 상속된 다른 모든 항목)
net6.0-macos xamarin.mac(+net6.0에서 상속된 다른 모든 항목)
net6.0-maccatalyst xamarin.ios(+net6.0에서 상속된 다른 모든 항목)
net6.0-tvos xamarin.tvos(+net6.0에서 상속된 다른 모든 항목)
net6.0-windows (net5.0-windows의 후속 버전)

 

C# 언어 버전 관리

원문: https://docs.microsoft.com/ko-kr/dotnet/csharp/language-reference/configure-language-version#defaults

 

C# 언어 버전 관리 - C# 가이드

C# 언어 버전은 프로젝트에 따라 결정된다는 사실과 그 이유를 알아봅니다. 기본값을 수동으로 재정의하는 방법을 알아봅니다.

docs.microsoft.com

C# 8.0은 .NET Core 3.x 이상 버전에서만 지원

C# 9.0은 .NET 5 이상 버전에서만 지원

 

기본값

대상 프레임워크 버전 C# 언어 버전 기본값
.NET 6.x C# 10.0
.NET 5.x C# 9.0
.NET Core 3.x C# 8.0
.NET Core 2.x C# 7.3
.NET Standard 2.1 C# 8.0
.NET Standard 2.0 C# 7.3
.NET Standard 1.x C# 7.3
.NET Framework 모두 C# 7.3

기본값 재정의

<PropertyGroup>
   <LangVersion>latest</LangVersion>
</PropertyGroup>
값 의미
preview 컴파일러가 최신 미리 보기 버전의 유효한 언어 구문을 모두 허용합니다.
lastest 컴파일러가 최신 릴리스 버전(부 버전 포함)의 구문을 허용합니다.
latestMajor (default) 컴파일러가 최신 릴리스 주 버전의 구문을 허용합니다.

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