.net - 软件包安装在 docker 内，但实际命令提供异常

Question

我正在尝试在 .net 6 dockerized 项目中使用 ffmpeg 核心包。我在 Dockerfile 中安装 ffmpeg 核心，在解决方案中引用实际包 FFMpegCore 但是当我尝试应用 ffmpeg 核心库中的任何命令时，我收到错误

An error occurred trying to start process './ffmpeg' with workingdirectory '/var/task'. No such file or directory

Docker 构建完成，没有错误。
Dockerfile

FROM public.ecr.aws/lambda/dotnet:6 AS base
....
RUN apt-get install -y ffmpeg
....
FROM base AS final
WORKDIR /var/task
COPY --from=publish /app/publish .

根据 ffmpeg core docs 为了使用 ffmpeg 我需要设置它的二进制文件夹，所以我添加了 ffmpeg.config.json

{
  "BinaryFolder": "/var/task",
  "TemporaryFilesFolder": "/tmp"
}

当我尝试执行以下命令时抛出实际错误

An error occurred trying to start process './ffmpeg' with workingdirectory '/var/task'. No such file or directory

这是触发错误的地方

 using FFMpegCore;
 ...
 public class MyController : ControllerBase
    {
        public async Task<string> Get()
        {    
             await FFMpegArguments
                   .FromPipeInput(new StreamPipeSource(myfile))
                   .OutputToPipe(new StreamPipeSink(outputStream), options => options
                      .WithVideoCodec("vp9")
                      .ForceFormat("webm"))
                      .ProcessAsynchronously();
             ...
        }    
    }

更新:
更改后 BinaryFolder定位到 /usr/bin我收到以下错误

An error occurred trying to start process '/usr/bin/ffmpeg' with working directory '/var/task'. No such file or directory

更新#2
这是我完整的 Dockerfile

FROM public.ecr.aws/lambda/dotnet:6 AS base

FROM mcr.microsoft.com/dotnet/sdk:6.0-bullseye-slim as build
WORKDIR /src
COPY ["AWSServerless.csproj", "AWSServerless/"]
RUN dotnet restore "AWSServerless/AWSServerless.csproj"

WORKDIR "/src/AWSServerless"
COPY . .
RUN dotnet build "AWSServerless.csproj" --configuration Release --output /app/build

FROM build AS publish   

RUN apt-get update \
    && apt-get install -y apt-utils libgdiplus libc6-dev \
    && apt-get install -y ffmpeg

RUN dotnet publish "AWSServerless.csproj" \
            --configuration Release \ 
            --runtime linux-x64 \
            --self-contained false \ 
            --output /app/publish \
            -p:PublishReadyToRun=true  

FROM base AS final
WORKDIR /var/task

CMD ["AWSServerless::AWSServerless.LambdaEntryPoint::FunctionHandlerAsync"]
COPY --from=publish /app/publish .

Answer 1

您是在告诉它二进制文件在 /var/task 中在 ffmpeg.config.json , 但是 apt-get install -y ffmpeg在 /usr/bin 中安装 ffmpeg .更改BinaryFolder像这样配置值

{
  "BinaryFolder": "/usr/bin",
  "TemporaryFilesFolder": "/tmp"
}

您还需要安装 ffmpeg在 Dockerfile 中的某个点，它将最终出现在最终图像中。现在，您将它安装在 Dockerfile 的构建/发布部分中，该部分不用于最终镜像。
试试这个

FROM public.ecr.aws/lambda/dotnet:6 AS base
# Install ffmpeg
RUN mkdir /ffmpeg && \
    cd /ffmpeg && \
    yum -y install tar xz && \
    curl https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o ffmpeg.tar.xz -s && \
    tar -xf ffmpeg.tar.xz && \
    mv ffmpeg-*-amd64-static/ffmpeg /usr/bin && \
    cd / && \
    rm -rf ffmpeg

FROM mcr.microsoft.com/dotnet/sdk:6.0-bullseye-slim as build
WORKDIR /src
COPY ["AWSServerless.csproj", "AWSServerless/"]
RUN dotnet restore "AWSServerless/AWSServerless.csproj"

WORKDIR "/src/AWSServerless"
COPY . .
RUN dotnet build "AWSServerless.csproj" --configuration Release --output /app/build

FROM build AS publish   
RUN dotnet publish "AWSServerless.csproj" \
            --configuration Release \ 
            --runtime linux-x64 \
            --self-contained false \ 
            --output /app/publish \
            -p:PublishReadyToRun=true  

FROM base AS final
WORKDIR /var/task

CMD ["AWSServerless::AWSServerless.LambdaEntryPoint::FunctionHandlerAsync"]
COPY --from=publish /app/publish .