在 s3 上设置 mp4 文件的内容类型 [英] setting content-type for mp4 files on s3

问题描述

借助回形针 gem 和 s3 存储，我将用户上传的视频添加到我的 RoRs 站点.出于某种我无法弄清楚的原因，每当用户上传 mp4 文件时，s3 都会将该文件的内容类型设置为 application/mp4 而不是 video/mp4.

I am adding user uploaded videos to my RoRs site with the help of the paperclip gem and s3 storage. For some reason that I can't figure out, whenever a user uploads an mp4 file, s3 sets content-type for that file as application/mp4 instead of video/mp4.

请注意，我已经在初始化文件中注册了 mp4 mime 类型:

Note that I have registered mp4 mime type in an initializer file:

Mime::Type.lookup_by_extension('mp4').to_s=>视频/mp4"

这是我的 Post 模型的相关部分:

Here is the relevant part of my Post model:

  has_attached_file :video, 
                :storage => :s3,
                :s3_credentials => "#{Rails.root.to_s}/config/s3.yml",
                :path => "/video/:id/:filename"

  validates_attachment_content_type :video,
     :content_type => ['video/mp4'],
     :message => "Sorry, this site currently only supports MP4 video"

我的回形针和/或 s3 设置中缺少什么.

What am I missing in my paperclip and/or s3 set-up.

####Update#####

由于某种原因超出了我对 Rails 的了解，我的 mp4 包含文件的默认 MIME 类型如下:

For some reason that is beyond my knowledge of Rails, my default mime types for mp4 contained files is the following:

    MIME::Types.type_for("my_video.mp4").to_s
 => "[application/mp4, audio/mp4, video/mp4, video/vnd.objectvideo]" 

因此，当回形针将 mp4 文件发送到 s3 时，它似乎将文件的 mime 类型标识为第一个默认值，即application/mp4".这就是为什么 s3 将文件标识为具有application/mp4"内容类型的原因.因为我想启用这些 mp4 文件的流式传输，所以我需要回形针来将文件识别为具有视频/mp4"的 MIME 类型.

So, when paperclip send an mp4 file to s3, it seems to identify the file's mime type as the first default, "application/mp4". That is why s3 identifies the file as having a content-type of "application/mp4". Because I want to enable streaming of these mp4 files, I need paperclip to identify the file as having a mime type of "video/mp4".

有没有办法修改回形针(可能在 before_post_process 过滤器中)来实现这一点，或者有没有办法通过 init 文件修改 rails 以将 mp4 文件识别为视频/mp4".如果我可以做任何一个，哪种方式最好.

Is there a way to modify paperclip (maybe in a before_post_process filter) to allow for this, or is there a way to modify rails through an init file to identify mp4 files as being "video/mp4". If I could do either, which way is best.

感谢您的帮助

推荐答案

原来我需要在模型中设置一个默认的 s3 标头 content_type.这对我来说不是最好的解决方案，因为在某些时候我可能会开始允许使用 mp4 以外的视频容器.但它让我继续解决下一个问题.

Turns out that I needed to set a default s3 header content_type in the model. This isn't the best solution for me because at some point I might start allowing video containers other than mp4. But it gets me moving on to the next problem.

  has_attached_file :video, 
                :storage => :s3,
                :s3_credentials => "#{Rails.root.to_s}/config/s3.yml",
                :path => "/video/:id/:filename",
                :s3_headers =>  { "Content-Type" => "video/mp4" }

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