[vlc-devel] [PATCH 2 of 6] avcodec: add HDYC to known ffmpeg chroma table

Edouard Gomez edouard.gomez at gmail.com
Fri Oct 10 23:00:28 CEST 2008

Laurent Aimar (fenrir at via.ecp.fr) wrote:
>  Theoricaly, HDYC != 422 (colorspace BT709 iof BT470) but it is ok as they
> are close and we don't handle that correctly anyway.
> -> OK for me.

Yep, HDYC (BT709) isn't exactly UYVY (BT601). And I came to the same conclusion
as you... that is: 16-235 range will be messed up, but better get something than

>  What I don't like is that the vlc core might react weird as it will(?) not
> undestand that HDYC can be handled as I422.
>  Could you check if using directly I422 fourcc in dshow plugin is faster
> or not ?

Not immediatly as I laoaned the card to a friend of mine for his video footage
work. But as soon as i get the card back, i can force UYVY fourcc instead
of HDYC one and give you feedback.

Edouard Gomez

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