[PD] horizontal video lines
cgc at humboldtblvd.com
Wed Dec 1 03:01:08 CET 2004
On Nov 30, 2004, at 2:02 PM, sara kolster wrote:
> Hi Yves and others,
> I still have problems with getting proper video output when i use the
> firewire-camera object from PDP on OSX. Somehow there seems to be a
> field swap problem which makes horizontal lines in the video-image.
> Does anyone else have this problem also? And, is there something i can
> do to fix this?
Horizontal lines like interlacing? That would be caused by not setting
the proper flag for QT to deliver deinterlaced progressive images. If
I remember correctly, this QT call does this for video input:
or it could be this:
I don't have a DV camera to test this with right now, but maybe an OSX
GEM user can test by sending a 'quality 1' message to pix_video
followed by a 'reset' message. 'quality 0' is channelPlayNormal and
'quality 1' is channelPlayHighQuality.
This is the call that does the same for movie files:
SetMoviePlayHints(m_movie, hintsHighQuality, hintsHighQuality);
You don't have to change the C code to get non-interlaced movie
playback. QTPro can set the appropriate flags for each file and unless
the app overrides them, Quicktime will play them properly.
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