上传时从视频中获取缩略图. (Azure Blob存储) [英] Grabbing a thumbnail from a video when uploading. (Azure Blob Storage)

问题描述

我目前有一个将视频上传到Azure blob存储并可以正常工作的系统.我想实现一项功能，该功能可以在上传时从视频中获取缩略图，并将其也推送到Azure.

I currently has a system that uploads videos to Azure blob storage and works fine. I would like to implement a feature that grabs a thumbnail from the video while uploading and pushes it to Azure as well.

我尝试按照建议使用它:

I tried using this as suggested:

new FFMpegConverter().GetVideoThumbnail(file, outputJPEG);

问题在于我不确定要用作outputJPEG，因为我没有要写入的文件，而是想将该文件写入Azure的Blob存储.

The problem is that I am not sure what to use as outputJPEG as I don't have a file I am writing to, but rather want to write that file to Azure's blob storage.

有人可以帮我解决这个问题，或者建议其他方法吗?

Can anyone help me figure out this issue, or perhaps suggest an alternative method?

我尝试过:

• 创建一个新的空HttpPostedFileBase作为outputJPEG文件，但这是不可能的，因为它仅接受用户上传的文件.

• Creating a new, empty HttpPostedFileBase as the outputJPEG file but this is impossible as it only accepts user uploaded files.

使用文件流，但这似乎不起作用，因为它需要写入文件的位置，而不是让我直接进入blob存储. (通过:blob.UploadFromStream(file.InputStream);)

Using filestream but this does not seem to work as it requires a location of a file it's writing to, rather than letting me just push to the blob storage. (via: blob.UploadFromStream(file.InputStream);)

在此先感谢您的帮助！

推荐答案

似乎有一个覆盖了流的替代项，因此您可以将其写入内存流，然后获取该内存流并在其中创建一个新文件. Blob存储区:

It looks like there is an override that takes a stream, so you could write it to a memory stream and then take the memory stream and create a new file in the blob store:

MemoryStream ms = new MemoryStream();
var converter = new FFMpegConverter();

converter.GetVideoThumbnail(file, ms);

ms.Position = 0;

// Write ms to a blob object here
blockblob.UploadFromStream(ms);

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