Media (Intel® oneAPI Video Processing Library, Intel Media SDK)
Access community support with transcoding, decoding, and encoding in applications using media tools from Intel. This includes Intel® oneAPI Video Processing Library and Intel® Media SDK.

Jpeg Smartscale supported by MJpeg decoder?


does the MediaSDK MJpeg decoder support SmartScale extension?

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

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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