6e685cdd42
Disallow uploading videos with 10-bit color or 4:4:4 chroma subsampling. Neither of these features are supported by Firefox. Only 8 such videos have been uploaded to Danbooru: * https://danbooru.donmai.us/media_assets/3070695 (4:4:4) * https://danbooru.donmai.us/media_assets/3070697 (4:4:4) * https://danbooru.donmai.us/media_assets/3292518 (4:4:4) * https://danbooru.donmai.us/media_assets/3358659 (10-bit) * https://danbooru.donmai.us/media_assets/3358660 (10-bit) * https://danbooru.donmai.us/media_assets/3730866 (10-bit) * https://danbooru.donmai.us/media_assets/5056665 (10-bit) * https://danbooru.donmai.us/media_assets/5479605 (4:4:4) Note that Exiftool doesn't output this information, so it's not in the EXIF metadata. We have to reply on ffprobe at upload time instead. Followup to #3615.
55 lines
1.8 KiB
Ruby
55 lines
1.8 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?, :pix_fmt, :video_codec, :video_stream, :video_streams, :audio_streams, 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 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? && 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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# True if decoding the video fails.
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def is_corrupt?
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video.playback_info.blank?
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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, :duration, :has_audio?
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end
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