ruby-on-rails - Carrierwave gem 视频上传和带旋转的缩略图生成

Question

我正在使用 Carrierwave gem 上传从 iPhone 录制的视频，并创建使用 carrierwave-video-thumbnailer gem 上传的视频的缩略图.

现在我面临着由 carrierwave-video-thumbnailer gem 生成的旋转缩略图的问题。我需要根据视频方向旋转到纵向。

请在下面查看我的 VideoUploader 类。

class VideoUploader < CarrierWave::Uploader::Base
  include CarrierWave::Video
  include CarrierWave::Video::Thumbnailer

  # Include RMagick or MiniMagick support:
  # include CarrierWave::RMagick
  # include CarrierWave::MiniMagick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
    process thumbnail: [{format: 'jpg', quality: 7, size: 640, strip: false, logger: Rails.logger}]
    def full_filename for_file
      png_name for_file, version_name
    end
    process :set_content_type_jpg
  end

  def png_name for_file, version_name
    %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.jpg}
  end

  def set_content_type_jpg(*args)
    Rails.logger.debug "#{file.content_type}"
    self.file.instance_variable_set(:@content_type, "image/jpeg")
  end
end

Answer 1

你应该包括:

include CarrierWave::RMagick

并基于this

process :do_stuff

def do_stuff(blur_factor)
  manipulate! do |img|
    img = img.auto_orient
    # or something similar
  end
end

可以找到 RMagick 的完整操作列表 here .