[libdv-dev] Re: yuv2lav problem and NTSC DV decoding

[Christoph S. <ch...@ne...>]

> > > As for YUV422 - I think the mjpeg tools should work with this.  At least
> > > the main change I made some time ago to support JPEG from bttv capture was
> > > to make things work with YUV422 JPEG.   You'll need to have a hunt around
> > > inside the mjpeg lib and/or the io libraries if it doesn't work.  The
> > > biggest likelihood is simply that the YUV422/YUV420 info is getting lost
> > > somewhere.
> > Support for YUV422 would be really good since that is now the default output
> > format from libdv for all DV formats (YUV 420 and 411 are upsampled) and it
> 
> NO. libdv does no upsampling. Color information is just repeated. A common planar
> output format for post processing would be very useful.
Thanks for pointing that out with the repeated color information. Is there
anybody working on providing a common planar YUV output format for libdv? It
is pretty straightforward to reorder the data, but it would be nicer if the
library would already provide a call that returns planar data for
post-processing even if the planar format is slower when passed to video
cards through Xv. I guess that would also give better performance than an
additional reordering step to go from packed -> planar.

> Interlacing:
> Some DV camcorders are able to record progressive mode sequences at full
> frame rate. If this information is useful for encoding in into other formats
> it is possible to provide this information per frame. An example for
> progressive mode recording is pond.dv .
I think that would be very convenient to have that information since mpeg2enc
already has options for progressive or field based MPEG 2 output. Would it be
possible to pass this information through the stream? Or is there a general
problem with switching between interlace modes while encoding MPEG?

Christoph


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 Christoph Scheurer              e-mail: ch...@fe...
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