Re: [RFC] V4L2_PIX_FMT_MJPEG vs V4L2_PIX_FMT_JPEG

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Hi Hans,

On Monday, 1 October 2018 14:54:29 EEST Hans Verkuil wrote:
> On 10/01/2018 01:48 PM, Laurent Pinchart wrote:
> > On Monday, 1 October 2018 11:43:04 EEST Hans Verkuil wrote:
> >> It turns out that we have both JPEG and Motion-JPEG pixel formats
> >> defined.
> >> 
> >> Furthermore, some drivers support one, some the other and some both.
> >> 
> >> These pixelformats both mean the same.
> > 
> > Do they ? I thought MJPEG was JPEG using fixed Huffman tables that were
> > not included in the JPEG headers.
> 
> I'm not aware of any difference. If there is one, then it is certainly not
> documented.

What I can tell for sure is that many UVC devices don't include Huffman tables 
in their JPEG headers.

> Ezequiel, since you've been working with this recently, do you know anything
> about this?

-- 
Regards,

Laurent Pinchart






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