3172031caa
If a media asset is corrupt, include the error message from libvips or ffmpeg in the "Vips:Error" or "FFmpeg:Error" fields in the media metadata table. Corrupt files can't be uploaded nowadays, but they could be in the past, so we have some old corrupted files that we can't generate thumbnails for. This lets us mark these files in the metadata so they're findable with the tag search `exif:Vips:Error`. Known bug: Vips has a single global error buffer that is shared between threads and that isn't cleared between operations. So we can't reliably get the actual error message because it may pick up errors from other threads, or from previous operations in the same thread.
54 lines
1.8 KiB
Ruby
54 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?, :is_corrupt?, :pix_fmt, :video_codec, :video_stream, :video_streams, :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({ "FFmpeg:Error" => error }.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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