From: Francois.CAU@st.com
To: sacha@ssl.co.uk
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: tv tuner/video
Date: Tue, 23 Nov 1999 13:45:34 +0100 [thread overview]
Message-ID: <H0000a4207bc43dd@MHS> (raw)
In-Reply-To: <383A6B90.7734B3D5@ssl.co.uk>
> 1. What is the state of tv card support on LinuxPPC? I've searched the
> linuxppc-dev logs and seen some announcements of bt848 support.
The bttv driver (driver for bt848 based cards) is working on LinuxPPC.
> 2. The bt848 cards I've seen seems to offer v. limited real-time continuous
> capture (320 x240 == 1/4 NTSC); I don't know if this is a limitation of the
> chipset or the cards. I'm looking for full streaming PAL capture to memory.
> Is this beyond the bandwidth of PCI? If so, is it usual for cards that
> offer this to do hardware compression first?
The PCI bandwidth is large enough for video. TV applications like xawtv
have 2 modes:
- Overlay, where the TV card is PCI-bus-master and directly writes in the
video memory.
- Grabbing, where the application grabs each picture, and then displays it
on the screen. You can even process the pictures before displaying them.
The bottle-neck for continuous capture of un-compressed, full-size video
comes from the hard-disk.
Francois
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-11-23 12:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-23 10:25 tv tuner/video Sacha Varma
1999-11-23 12:45 ` Francois.CAU [this message]
1999-11-23 19:21 ` Gerd Knorr
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