将原始[]字节视频管道传输到FFMPEG-GO

Question

//Parsing video
videoData, err := ioutil.ReadAll(r.Body)
if err != nil {
    w.WriteHeader(UPLOAD_ERROR)
    w.Write([]byte("Error uploading the file"))
    return
}

        filename := "test.mp4"
        width := 640
        height := 360
        cmd := exec.Command("ffmpeg", "-i", filename, "-vframes", "1", "-s", fmt.Sprintf("%dx%d", width, height), "-f", "singlejpeg", "-")
        var buffer bytes.Buffer
        cmd.Stdout = &buffer
        if cmd.Run() != nil {
            panic("could not generate frame")
        }

（编辑：我现在试图将[]字节数组传输到ffmpeg，但是ffmpeg没有填满我的缓冲区：

width := 640
height := 360
log.Print("Size of the video: ", len(videoData))


cmd := exec.Command("ffmpeg", "-i", "pipe:0", "-vframes", "1", "-s", fmt.Sprintf("%dx%d", width, height), "-f", "singlejpeg", "-")
cmd.Stdin = bytes.NewReader(videoData)

var imageBuffer bytes.Buffer
cmd.Stdout = &imageBuffer
err := cmd.Run()

if err != nil {
    log.Panic("ERROR")
}

imageBytes := imageBuffer.Bytes()
log.Print("Size of the image: ", len(imageBytes))

但我得到以下错误：

[mov,mp4,m4a,3GP,3G2,mj2@0x7FF05D002600]流0,偏移量0x5Ded:部分文件

Answer 1

我需要一个视频的单一帧，并转换成一个PNG。这就是有人用FFMPEG做这件事的方式。

有一个流行的go库正是为您搜索的内容而设计的：https://github.com/bakape/thumbnailer

thumbnailDimensions := thumbnailer.Dims{Width: 320, Height: 130}

thumbnailOptions := thumbnailer.Options{JPEGQuality:100, MaxSourceDims:thumbnailer.Dims{}, ThumbDims:thumbnailDimensions, AcceptedMimeTypes: nil}

sourceData, thumbnail, err := thumbnailer.ProcessBuffer(videoData, thumbnailOptions)

imageBytes := thumbnail.Image.Data

他们暗中使用ffmpeg，但为您删除了抽象。