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Marcello Costagliola
9912e63d69
A video's preview and a picture's thumbnail are made inside the request that posts the message, and nothing bounded how long either could take. - The video preview filter also selects any frame from 5 seconds on. Rails' filter takes the second frame it selects, which a video with a single keyframe and no scene change only gives at its end, so ffmpeg decoded all of it. - TimeLimitedVideoPreviewer gives ffmpeg 10 seconds of wall-clock time, kills it past that, and reports a failed preview, so the message is posted without one. - Pictures and videos above 250 megapixels, or whose size couldn't be read, get no preview: decoding costs in proportion to the pixels, however small the file. - The view shows a preview only if it was made when the message was posted. Its URL used to make it on view, so a preview that failed or was skipped would be attempted again on every view. The cached presentation's version goes up, so cached messages pick this up. - A video's poster is made, when the message is posted, at the size the view shows it. The full-size WebP made until now wasn't shown anywhere, and encoding it costs in proportion to the frame's pixels. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Bj8KnxpTf9sj2Ysa8aLAVa
60 lines
1.8 KiB
Ruby
60 lines
1.8 KiB
Ruby
module Message::Attachment
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extend ActiveSupport::Concern
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THUMBNAIL_MAX_WIDTH = 1200
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THUMBNAIL_MAX_HEIGHT = 800
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# Decoding a picture, or a video's frame, costs in proportion to its pixels, however small the file. The largest
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# phone photos have 200 million.
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THUMBNAIL_MAX_PIXELS = 250_000_000
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included do
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has_one_attached :attachment do |attachable|
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attachable.variant :thumb, resize_to_limit: [ THUMBNAIL_MAX_WIDTH, THUMBNAIL_MAX_HEIGHT ]
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attachable.variant :poster, format: :webp, resize_to_limit: [ THUMBNAIL_MAX_WIDTH, THUMBNAIL_MAX_HEIGHT ]
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end
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end
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module ClassMethods
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def create_with_attachment!(attributes)
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create!(attributes).tap(&:process_attachment)
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end
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end
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def attachment?
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attachment.attached?
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end
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def process_attachment
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ensure_attachment_analyzed
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process_attachment_thumbnail
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end
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private
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def ensure_attachment_analyzed
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attachment&.analyze
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end
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# A file that ffmpeg or libvips can't decode is still the message: post it without a preview.
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def process_attachment_thumbnail
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return if too_many_pixels_to_preview?
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case
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when attachment.video?
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attachment.preview(:poster).processed
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when attachment.representable?
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attachment.representation(:thumb).processed
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end
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rescue ActiveStorage::PreviewError, Vips::Error => error
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Rails.logger.warn "Posted #{attachment.filename} without a preview: #{error.class}: #{error.message.lines.first&.chomp}"
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end
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# Without a size, the analyzer couldn't read the file's header, and the previewer wouldn't either.
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def too_many_pixels_to_preview?
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if attachment.image? || attachment.video?
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width, height = attachment.metadata.values_at(:width, :height)
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width.nil? || height.nil? || width * height > THUMBNAIL_MAX_PIXELS
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end
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end
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end
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