Difference between revisions of "Significant characteristics of video files"
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| − | [[Main Page]] > [[Documentation]] > [[ | + | [[Main Page]] > [[Documentation]] > [[Media type preservation plans]] > [[Significant properties]] > Significant properties of video files |
*From [http://www.ahds.ac.uk/preservation/video-preservation-handbook.pdf Arts and Humanities Data Service Preservation Handbook: Moving Image, Gareth Night, 2005]: "For preservation purposes, the significant properties of digital video are the video length (e.g. 90 minutes, 20 seconds), frames per second (25 for PAL, 30 for NTSC), video dimensions (e.g. 720 pixels x 576 pixels), bit-rate (kbps), associated metadata, and file size. If audio is also provided, the audio bit-rate (kbps), frequency (kHz), and number of channels." (p.7) | *From [http://www.ahds.ac.uk/preservation/video-preservation-handbook.pdf Arts and Humanities Data Service Preservation Handbook: Moving Image, Gareth Night, 2005]: "For preservation purposes, the significant properties of digital video are the video length (e.g. 90 minutes, 20 seconds), frames per second (25 for PAL, 30 for NTSC), video dimensions (e.g. 720 pixels x 576 pixels), bit-rate (kbps), associated metadata, and file size. If audio is also provided, the audio bit-rate (kbps), frequency (kHz), and number of channels." (p.7) | ||
Revision as of 13:17, 9 March 2010
Main Page > Documentation > Media type preservation plans > Significant properties > Significant properties of video files
- From Arts and Humanities Data Service Preservation Handbook: Moving Image, Gareth Night, 2005: "For preservation purposes, the significant properties of digital video are the video length (e.g. 90 minutes, 20 seconds), frames per second (25 for PAL, 30 for NTSC), video dimensions (e.g. 720 pixels x 576 pixels), bit-rate (kbps), associated metadata, and file size. If audio is also provided, the audio bit-rate (kbps), frequency (kHz), and number of channels." (p.7)
- From The Significant Properties of Moving Images, Mike Coyne and Mike Stapleton, 2008, adapted from table on pages 61-2. Note that this table excludes properties intrinsic to audio aspects of moving image files:
| property value | component | property definition | constraint unit | datatype |
|---|---|---|---|---|
| imageStreams | video | the number of distinct video channels in the digital object | channels | positive integer |
| audioStreams | audio | the number of distinct audio channels in the digital object | channels | positive integer |
| length | video | the number of frames in the recording | frames | positive integer |
| width | frame | width of the image frame | pixels | positive integer |
| height | frame | height of the image frame | pixels | positive integer |
| bitDepth | pixel | the amount of data recorded for each pixel | bits | positive integer |
| colourModel | pixel | the colour model used when recording the pixel value | enumerated list | |
| colourSpace | pixel | the colour space used when recording the pixel value | enumerated list | |
| pixelAspectRatio | pixel | aspect ratio of the pixels making up the image | ratio | ratio |
| frameRate | video | the number of frames to be displayed in a given time interval | frames per second | positive integer? |
| lossless | video | whether the encoding is lossless | enumerated list | |
| compressionRatio | video | measures the degree of compression employed by the encoding | ratio | ratio |
| codec | video | identifies the codec used for encoding | enumerated list | name |
| interlace | frame | whether the source was interlaced video | boolean | boolean |
| metadata | the existence of metadata associated with the digital object | elements |