Submissions:DigitalVideo
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Diagram
General description
| Name: | Digital Video |
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| Submitted by: | PanagiotisMitzias, MarinaRiga, EfstratiosKontopoulos |
| Also Known As: | |
| Intent: | The pattern intends to model digital video files, their components and other associated entities, such as codecs and containers. This pattern has been developed by MKLab at CERTH/ITI for the PERICLES FP7 project. |
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| Solution description: | The pattern’s main entity is a digital video file (DigitalVideo). Appropriate object properties connect the video file with codecs, streams, containers, etc. Additionally, the model includes the most significant descriptors for all the previous notions, such as bitrate, aspect ratio, compression type, etc. |
| Reusable OWL Building Block: | http://mklab.iti.gr/pericles/DigitalVideo_ODP.owl (1002) |
| Consequences: | The design pattern is expected to facilitate the creation of digital video domain ontologies that will be exploited in the field of digital preservation. A well-established, comprehensible pattern will prove to be advantageous. |
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Elements
The DigitalVideo Content OP locally defines the following ontology elements:
Codec (owl:Class) A codec is a device or computer program capable of encoding or decoding a digital data stream or signal.
Codec page AudioCodec (owl:Class) An audio codec is a device or computer program capable of coding or decoding a digital data stream of audio.
E.g. MP3 AudioCodec page VideoCodec (owl:Class) A video codec is an electronic circuit or software that compresses or decompresses digital video, thus converting raw (uncompressed) digital video to a compressed format or vice-versa.
E.g. QuickTime H.264 (Apple's implementation for H.264/MPEG-4 AVC coding format) VideoCodec page Stream (owl:Class) A (data) stream is a sequence of digitally encoded coherent signals (packets of data or data packets) used to transmit or receive information that is in the process of being transmitted. The term stream is used here to define raw, uncompressed content (video or audio) prior to being encoded into a wrapper or after being decoded from a wrapper.
Stream page AudioStream (owl:Class) An audio stream is a stream where the carried data is audio content.
AudioStream page VideoStream (owl:Class) A video stream is a stream where the carried data is video content.
VideoStream page SubtitleStream (owl:Class) A subtitle stream is a stream where the carried data is subtitle content for a video.
SubtitleStream page Container (owl:Class) A container or wrapper format is a metafile format whose specification describes how different elements of data and metadata coexist in a computer file.
E.g. Matroska (MKV), MP4, etc. Container page Descriptor (owl:Class) Descriptors are the various elements describing a digital video, a container, a stream or a codec.
Descriptor page AnalogBroadcastStandard (owl:Class) The video color encoding system, if the video originates from analog television broadcasts.
E.g. NTSC, PAL, etc. AnalogBroadcastStandard page AspectRatio (owl:Class) The aspect ratio of an image describes the proportional relationship between its width and its height. It is commonly expressed as two numbers separated by a colon, as in 16:9.
E.g. 16:9, 4:3, etc. AspectRatio page Bit Rate (owl:Class) The bitrate is the data rate for a video or audio file. Video and audio data rates are given in bits per second.
E.g. 2 MBits/s BitRate page ChromaFormat (owl:Class) The chroma subsampling type. Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.
E.g. 4:2:0 ChromaFormat page CodingStandard (owl:Class) Also known as coding format or compression format.
E.g. H.264/MPEG-4 AVC CodingStandard page ColourSpaceType (owl:Class) A color space is a specific organization of colors. It allows for reproducible representations of color, in both analog and digital representations. A color space may be arbitrary, with particular colors assigned to a set of physical color swatches and corresponding assigned names or numbers.
E.g. YUV, RGB, etc. ClourSpaceType page CompressionType (owl:Class) The type of video compression.
E.g. lossy, lossless or uncompressed CompressionType page EmbeddingType (owl:Class) The type of embedment used to attach a subtitle stream to a video.
E.g. hard, prerendered, soft, etc. EmbeddingType page FrameRate (owl:Class) Frame rate, also known as frame frequency, is the frequency (rate) at which an imaging device produces unique consecutive images called frames. The term applies equally well to film and video cameras, computer graphics, and motion capture systems. Frame rate is most often expressed in frames per second (FPS) and is also expressed in progressive scan monitors as hertz (Hz).
E.g. 60 FPS FrameRate page PlaybackDuration (owl:Class) The duration of a video, video stream or audio stream.
E.g. 22 minutes PlaybackDuration page RangeType (owl:Class) The type of range a video is created for.
E.g. broadcast range or full range RangeType page SampleRate (owl:Class) The audio sample rate is the number of samples of audio carried per second, measured in Hz or kHz (one kHz being 1 000 Hz). For example, 44 100 samples per second can be expressed as either 44 100 Hz, or 44.1 kHz.
The video sample rate of a digital video format determines how often the light intensity of each video line is sampled.
E.g. 96 kHz, 74.25MHz, etc. SampleRate page SetOfStandards (owl:Class) Sets of standards standardize the format of a video stream.
E.g. BT.601 or BT.709 SetOfStandards page VideoCodecLevel (owl:Class) A video codec level is a specified set of constraints that indicate a degree of required decoder performance for a profile.
E.g. 4 VideoCodecLevel page VideoCodecProfile (owl:Class) The video codec profile is a set of capabilities and constraints apllied in the encoder. It allows the decoder to recognize the requirements to decode a specific stream.
E.g. baseline profile, extended profile, main profile, high profile, etc. VideoCodecProfile page VideoQualityMeasurement (owl:Class) Measurement carried out according to the video quality metric.
VideoQualityMeasurement page VideoQualityMetric (owl:Class) Process or software used to measure the quality of a video.
E.g. VQM VideoQualityMetric page
hasBitRate (owl:ObjectProperty) Associates an audio or video stream with a bit rate.
hasBitRate page wrappedBy (owl:ObjectProperty) Associates a digital video file with a container type.
wrappedBy page hasAudioStream (owl:ObjectProperty) Associates a digital video with an audio stream.
hasAudioStream page hasVideoStream (owl:ObjectProperty) Associates a digital video with a video stream.
hasVideoStream page hasSubtitleStream (owl:ObjectProperty) Associates a digital video with a subtitle stream.
hasSubtitleStream page hasCodingStandard (owl:ObjectProperty) Associates a video or audio stream with a coding standard.
hasCodingStandard page hasVideoQualityMeasurement (owl:ObjectProperty) Associates a video stream with a video quality measurement.
hasVideoQualityMeasurement page hasChromaFormat (owl:ObjectProperty) Associates a video stream with a chroma format.
hasChromaFormat page hasEmbeddingType (owl:ObjectProperty) Associates a subtitle stream with an embedding type.
hasEmbeddingType page hasAspectRatio (owl:ObjectProperty) Associates a video stream with an aspect ratio.
hasAspectRatio page hasSubtitleTextFormat (owl:ObjectProperty) Associates a subtitle stream with a subtitle text format.
hasSubtitleTextFormat page hasVideoQualityMetric (owl:ObjectProperty) Associates a video stream with a video quality metric.
hasVideoQualityMetric page hasCompressionType (owl:ObjectProperty) Associates a video or audio codec with a compression type.
hasCompressionType page hasVideoCodecProfile (owl:ObjectProperty) Associates a video codec with a video codec profile.
hasVideoCodecProfile page hasColourSpaceType (owl:ObjectProperty) Associates a video stream with a colour space type.
hasColourSpaceType page hasSetOfStandards (owl:ObjectProperty) Associates a video stream with a set of standards.
hasSetOfStandards page hasAnalogBroadcastStandard (owl:ObjectProperty) Associates a digital video with an analog broadcast standard.
hasAnalogBroadcastStandard page hasVideoCodecLevel (owl:ObjectProperty) Associates a video codec with a video codec level.
hasVideoCodecLevel page hasPlaybackDuration (owl:ObjectProperty) Associates a digital video, a video stream or an audio stream with a playback duration.
hasPlaybackDuration page hasYUVSampleRange (owl:ObjectProperty) Associates a video stream with a YUV sample range.
hasYUVSampleRange page hasSampleRate (owl:ObjectProperty) Associates a video stream or audio stream with a sample rate.
hasSampleRate pageAdditional information
Scenarios
Scenarios about DigitalVideo
No scenario is added to this Content OP.
Reviews
Reviews about DigitalVideo
There is no review about this proposal. This revision (revision ID 13288) takes in account the reviews: none
Other info at evaluation tab
Modeling issues
Modeling issues about DigitalVideo
There is no Modeling issue related to this proposal.
References
- The homepage of the PERICLES project that supported the development of this ODP. Project Home Page | reference page
- The paper presenting the ODP that was accepted for publication in the WOP'15 proceedings. Workshop publication | reference page
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