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我正在使用carrierwave-video gem 通过我的Rails 应用程序上传视频。当我尝试上传视频时，出现以下错误：

使用 FFmpeg 转码失败。检查 ffmpeg 安装并验证视频没有损坏或缩短。原始错误：nil 不是符号。

我相信我的 ffmpeg 安装是成功的，因为如果我可以成功运行以下命令：

qt-faststart input.mp4 output.mp4

仔细查看我的日志，视频文件的参数似乎是正确的，但是当应用程序尝试创建视频记录时，我有两个回滚：

Started POST "/videos" for 127.0.0.1 at 2013-09-27 11:42:04 -0400
Processing by VideosController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"5lMoFtM5Rrdu4Ra8ut8rD3jYv3FJ0cxo38QW5ATw9ZQ=", "video"=>{"project_id"=>"4", "step_id"=>"22", "saved"=>"true", "embed_url"=>"", "video_path"=>#<ActionDispatch::Http::UploadedFile:0x007f84702436b8 @original_filename="2013-08-02 17.19.02.mp4", @content_type="video/mp4", @headers="Content-Disposition: form-data; name=\"video[video_path]\"; filename=\"2013-08-02 17.19.02.mp4\"\r\nContent-Type: video/mp4\r\n", @tempfile=#<File:/var/folders/dc/c0nfvwy96lq7p4ll94mklnmr0000gp/T/RackMultipart20130927-1871-173l2g7>>}, "button"=>""}
  User Load (0.6ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
  Project Load (0.3ms)  SELECT "projects".* FROM "projects" WHERE "projects"."id" = $1 LIMIT 1  [["id", "4"]]
   (0.2ms)  BEGIN
   (0.2ms)  ROLLBACK
   (0.2ms)  BEGIN
   (0.1ms)  ROLLBACK
#<ActiveModel::Errors:0x007f847058fd08 @base=#<Video id: nil, embed_url: "", project_id: 4, step_id: 22, saved: true, created_at: nil, updated_at: nil, thumbnail_url: nil, image_id: nil, video_path: nil>, @messages={:video_path=>["Failed to transcode with FFmpeg. Check ffmpeg install and verify video is not corrupt or cut short. Original error: nil is not a symbol"]}>
Completed 406 Not Acceptable in 616ms (ActiveRecord: 1.6ms)

有没有人遇到过类似的问题，如果有，你是怎么解决的？

视频.rb：

class Video < ActiveRecord::Base
  # maybe we should add a title attribute to the video?
  attr_accessible :position, :project_id, :step_id, :image_id, :saved, :embed_url, :thumbnail_url, :video_path
  mount_uploader :video_path, VideoPathUploader
...
  def set_success(format, opt)
    self.success = true
  end
end

video_path_uploader.rb

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

  process encode_video: [:mp4, callbacks: { after_transcode: :set_success } ]

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

  # Choose what kind of storage to use for this uploader:
  # storage :file
  storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
    process thumbnail: [{format: 'png', quality: 10, size: 158, strip: false, logger: Rails.logger}]
    def full_filename for_file
      png_name for_file, version_name
    end
  end

  version :square_thumb do
     process thumbnail: [{format: 'png', quality: 10, size: 105, strip: false, logger: Rails.logger}]
    def full_filename for_file
      png_name for_file, version_name
    end
  end

end
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