图片和视频的回形针
Paperclip for both images and Videos
在我的应用程序中,我已经有了用于上传图片的回形针,但为了同时接受图片和视频,要求发生了变化。这些图像已经在具有 belongs_to
关系的模型中定义,称为 Attachment
。由于视频也将是同一父模型(在我的例子中是文章)的附件,我想为图像和视频重用相同的 Attachment
模型。这是个好主意吗?
我的attachment.rb
的代码是:
class Attachment < ActiveRecord::Base
belongs_to :article
has_attached_file :url, :s3_protocol => :https ,
styles: {
medium: "300x300>", thumb: "100x100>", big: "1200x1200>", normal: "600x600>"
}
validates_attachment_content_type :url, content_type: /\Aimage|\Avideo\/.*\Z/
validates_attachment :url, content_type: { content_type: ["image/jpeg", "image/gif", "image/png", "video/mp4"] }
end
但实际上,它并未在 S3 上存储视频。我在终端中得到以下内容
Command :: file -b --mime '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/f3e2afc957bb9fb2aa3e77e69359c48920160131-13311-pyeez1.mp4'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: file -b --mime '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/f3e2afc957bb9fb2aa3e77e69359c48920160131-13311-kvb5nr.mp4'
第二个问题是,由于我在前端使用 AngularJS,我是否可以利用 HTML <video>
标签将视频呈现给用户?
看起来问题是 ImageMagick
正在尝试 transcode 视频,但它不能。
在 Paperclip
中处理视频转码的方法是使用 paperclip-av-transcoder
gem (formerly paperclip-ffmpeg
)。我只对后者有经验:
#app/models/attachment.rb
class Attachment < ActiveRecord::Base
has_attached_file :url, :s3_protocol => :https ,
styles: lambda { |a| a.instance.is_image? ? medium: "300x300>", thumb: "100x100>", big: "1200x1200>", normal: "600x600>" } : {:thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10}, :medium => { :geometry => "300x300#", :format => 'jpg', :time => 10}}}, processors: [:transcoder]
validates_attachment :url,
content_type: ['video/mp4'],
message: "Sorry, right now we only support MP4 video",
if: :is_video?
validates_attachment :url,
content_type: ['image/png', 'image/jpeg', 'image/jpg', 'image/gif'],
message: "Different error message",
if: :is_image?
private
def is_video?
url.instance.attachment_content_type =~ %r(video)
end
def is_image?
url.instance.attachment_content_type =~ %r(image)
end
end
Our old code & ref
在我的应用程序中,我已经有了用于上传图片的回形针,但为了同时接受图片和视频,要求发生了变化。这些图像已经在具有 belongs_to
关系的模型中定义,称为 Attachment
。由于视频也将是同一父模型(在我的例子中是文章)的附件,我想为图像和视频重用相同的 Attachment
模型。这是个好主意吗?
我的attachment.rb
的代码是:
class Attachment < ActiveRecord::Base
belongs_to :article
has_attached_file :url, :s3_protocol => :https ,
styles: {
medium: "300x300>", thumb: "100x100>", big: "1200x1200>", normal: "600x600>"
}
validates_attachment_content_type :url, content_type: /\Aimage|\Avideo\/.*\Z/
validates_attachment :url, content_type: { content_type: ["image/jpeg", "image/gif", "image/png", "video/mp4"] }
end
但实际上,它并未在 S3 上存储视频。我在终端中得到以下内容
Command :: file -b --mime '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/f3e2afc957bb9fb2aa3e77e69359c48920160131-13311-pyeez1.mp4'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/8dc7385648e2164764b72fda6fd9099a20160131-13311-1l40ccn.mp4[0]' 2>/dev/null
[paperclip] An error was received while processing: #<Paperclip::Errors::NotIdentifiedByImageMagickError: Paperclip::Errors::NotIdentifiedByImageMagickError>
Command :: file -b --mime '/var/folders/v_/pf2bsxnj1y37ccd2pjksv7z80000gn/T/f3e2afc957bb9fb2aa3e77e69359c48920160131-13311-kvb5nr.mp4'
第二个问题是,由于我在前端使用 AngularJS,我是否可以利用 HTML <video>
标签将视频呈现给用户?
看起来问题是 ImageMagick
正在尝试 transcode 视频,但它不能。
在 Paperclip
中处理视频转码的方法是使用 paperclip-av-transcoder
gem (formerly paperclip-ffmpeg
)。我只对后者有经验:
#app/models/attachment.rb
class Attachment < ActiveRecord::Base
has_attached_file :url, :s3_protocol => :https ,
styles: lambda { |a| a.instance.is_image? ? medium: "300x300>", thumb: "100x100>", big: "1200x1200>", normal: "600x600>" } : {:thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10}, :medium => { :geometry => "300x300#", :format => 'jpg', :time => 10}}}, processors: [:transcoder]
validates_attachment :url,
content_type: ['video/mp4'],
message: "Sorry, right now we only support MP4 video",
if: :is_video?
validates_attachment :url,
content_type: ['image/png', 'image/jpeg', 'image/jpg', 'image/gif'],
message: "Different error message",
if: :is_image?
private
def is_video?
url.instance.attachment_content_type =~ %r(video)
end
def is_image?
url.instance.attachment_content_type =~ %r(image)
end
end
Our old code & ref