42 lines
931 B
Ruby
42 lines
931 B
Ruby
# A MediaFile for a webm or mp4 video. Uses ffmpeg to generate preview
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# thumbnails.
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#
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# @see https://github.com/streamio/streamio-ffmpeg
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class MediaFile::Video < MediaFile
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def dimensions
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[video.width, video.height]
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end
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def duration
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video.duration
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end
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def preview(max_width, max_height)
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preview_frame.preview(max_width, max_height)
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end
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def crop(max_width, max_height)
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preview_frame.crop(max_width, max_height)
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end
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def has_audio?
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video.audio_channels.present?
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end
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private
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def video
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raise NotImplementedError, "can't process videos: ffmpeg or mkvmerge not installed" unless self.class.videos_enabled?
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FFMPEG::Movie.new(file.path)
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end
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def preview_frame
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vp = Tempfile.new(["video-preview", ".jpg"], binmode: true)
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video.screenshot(vp.path, seek_time: 0)
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MediaFile.open(vp.path)
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end
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memoize :video, :preview_frame, :dimensions, :duration, :has_audio?
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end
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