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The Intel Media SDK project is no longer active. For continued support and access to new features, Intel Media SDK users are encouraged to read the transition guide on upgrading from Intel® Media SDK to Intel® Video Processing Library (VPL), and to move to VPL as soon as possible.
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3075 Discussions

Jpeg Smartscale supported by MJpeg decoder?

Ralf_K_
Beginner
‎02-11-2017 02:54 PM
402 Views

does the MediaSDK MJpeg decoder support SmartScale extension?

I need to decode a transcoded MJPeg-Stream, which uses this extension.

http://jpegclub.org/

New jpegtran -scale lossless resize feature

A new option has been added to the jpegtran tool and transcoding library:

    -scale M/N     Scale output image by fraction M/N, eg, 1/8

Currently supported scale factors are M/N with all M from 1 to 16, where N is the source DCT size, which is 8 for baseline JPEG. If the /N part is omitted, then M specifies the DCT scaled size to be applied on the given input. For baseline JPEG this is equivalent to M/8 scaling, since the source DCT size for baseline JPEG is 8. CAUTION: An implementation of the JPEG SmartScale extension is required for this feature. SmartScale enabled JPEG is not yet widely implemented, so many decoders will be unable to view a SmartScale extended JPEG file at all.

 

 

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