523d7afdd1
Include the following metadata tags for videos: * FFmpeg:MajorBrand (e.g. mp42) * FFmpeg:PixFmt (e.g. yuv420p. Indicates bit depth and color subsampling mode) * FFmpeg:FrameCount (e.g. total number of frames in the video) * FFmpeg:VideoCodec (e.g. h264) * FFmpeg:VideoProfile (e.g. Main) * FFmpeg:AudioCodec (e.g. AAC) * FFmpeg:AudioProfile (e.g. LC) * FFmpeg:AudioLayout (e.g. stereo) * FFmpeg:AudioBitRate (e.g. 128kb/s)
65 lines
2.3 KiB
Ruby
65 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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# 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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delegate :duration, :frame_count, :frame_rate, :has_audio?, :is_corrupt?, :major_brand, :pix_fmt, :video_codec, :video_stream, :video_streams, :audio_codec, :audio_stream, :audio_streams, :error, to: :video
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def dimensions
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[video.width, video.height]
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end
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def preview!(max_width, max_height, **options)
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preview_frame.preview!(max_width, max_height, **options)
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end
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def metadata
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super.merge({
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"FFmpeg:Error" => error,
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"FFmpeg:MajorBrand" => major_brand,
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"FFmpeg:PixFmt" => pix_fmt,
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"FFmpeg:FrameCount" => frame_count,
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"FFmpeg:VideoCodec" => video_codec,
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"FFmpeg:VideoProfile" => video_stream[:profile],
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"FFmpeg:AudioCodec" => audio_codec,
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"FFmpeg:AudioProfile" => audio_stream[:profile],
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"FFmpeg:AudioLayout" => audio_stream[:channel_layout],
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"FFmpeg:AudioBitRate" => audio_stream[:bit_rate],
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}.compact_blank)
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end
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def is_supported?
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return false if video_streams.size != 1
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return false if audio_streams.size > 1
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return false if is_webm? && exif_metadata["Matroska:DocType"] != "webm"
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return false if is_mp4? && !video_codec.in?(["h264", "vp9"])
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# Only allow pixel formats supported by most browsers. Don't allow 10-bit video or 4:4:4 subsampling (neither are supported by Firefox).
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#
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# yuv420p: 8-bit YUV, 4:2:0 subsampling. The vast majority of videos use this format.
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# yuvj420p: 8-bit YUV, 4:2:0 subsampling, color range restricted to 16-235. Uncommon, but widely supported.
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# yuv444p: 8-bit YUV, 4:4:4 subsampling (i.e. no subsampling). Uncommon, not supported by Firefox.
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# yuv420p10le: 10-bit YUV, 4:2:0 subsampling (i.e. 10-bit video). Uncommon, not supported by Firefox.
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# gbrp: 8-bit RGB (used by VP9). Uncommon, but widely supported.
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#
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# https://github.com/FFmpeg/FFmpeg/blob/master/libavutil/pixfmt.h
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return false if !pix_fmt.in?(%w[yuv420p yuvj420p gbrp])
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true
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end
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private
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def video
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FFmpeg.new(file)
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end
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def preview_frame
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video.smart_video_preview
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end
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memoize :video, :preview_frame, :dimensions, :metadata, :duration, :has_audio?
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end
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