From mboxrd@z Thu Jan 1 00:00:00 1970 From: Francois.CAU@st.com Date: Tue, 23 Nov 1999 13:45:34 +0100 Message-Id: In-Reply-To: <383A6B90.7734B3D5@ssl.co.uk> Subject: Re: tv tuner/video MIME-Version: 1.0 To: sacha@ssl.co.uk Cc: linuxppc-dev@lists.linuxppc.org Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: > 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/