class ActiveStorage::Previewer::VideoPreviewer
Public Class Methods
accept?(blob)
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# File lib/active_storage/previewer/video_previewer.rb, line 8 def accept?(blob) blob.video? && ffmpeg_exists? end
ffmpeg_exists?()
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# File lib/active_storage/previewer/video_previewer.rb, line 12 def ffmpeg_exists? return @ffmpeg_exists if defined?(@ffmpeg_exists) @ffmpeg_exists = system(ffmpeg_path, "-version", out: File::NULL, err: File::NULL) end
ffmpeg_path()
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# File lib/active_storage/previewer/video_previewer.rb, line 18 def ffmpeg_path ActiveStorage.paths[:ffmpeg] || "ffmpeg" end
Public Instance Methods
preview(**options) { |io: output, filename: "#{filename.base}.jpg", content_type: "image/jpeg", **options| ... }
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# File lib/active_storage/previewer/video_previewer.rb, line 23 def preview(**options) download_blob_to_tempfile do |input| draw_relevant_frame_from input do |output| yield io: output, filename: "#{blob.filename.base}.jpg", content_type: "image/jpeg", **options end end end
Private Instance Methods
draw_relevant_frame_from(file, &block)
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# File lib/active_storage/previewer/video_previewer.rb, line 32 def draw_relevant_frame_from(file, &block) draw self.class.ffmpeg_path, "-i", file.path, *Shellwords.split(ActiveStorage.video_preview_arguments), "-", &block end