2.1. Bttv Basics
If you haven't figured it out by now, this document deals with the Linux-specific
configuration of frame grabber cards that include the
Conexant Bt848 and related family
of video decoder chips, collectively referred to as the "Bt8x8" chipset.
You can probably see the Bt8x8 chip (it's usually labelled as such) embedded on your
TV card upon inspection, in addition to other chips which you should probably make note of
before installation in case there are problems later.
The "Bt" stands for Brooktree, after the original manufacturer of
the chipset, now a part of Conexant. The Bt8x8 family has enjoyed remarkable longevity in a world where
Moore's Law is the rule,
the first ISA boards manufactured in the mid-1990s. There are several chips in this family, including the Bt848,
Bt848A, Bt849, Bt878 and Bt879, and as a rule are all supported by the
BTTV driver for which
this document is named.
In addition to the Bt8x8 decoder chip, these cards vary by accompanying components such as the tuner and sound decoder, and may include an optional videotext decoder, radio tuner, and/or hardware mpeg encoder.
Note that the next generation of bt8x8, the
Conexant 2388x, is now supported by a driver in the Linux 2.6 kernel. The configuration
of hardware with that chipset is beyond the scope of this document (but similar).
In general, any PCI card with a Bt8x8 chipset should work with the Linux Bttv driver.
TV cards known NOT to work include the following:
Cards with a Zoran 36057/36067 PCI controller chipset, which are instead
supported by this driver,
and includes the following models:
Iomega Buz
Pinnacle DC10+
Linux Media Labs LML33
Cards with a Philips SAA7130/7134 controller
Multimedia eXtension Board cards, manufactured by Siemens-Nixdorf
Hexium HV-PCI6, Orion or Gemini framegrabber cards
Any ISA-based TV card
If you are uncertain which chipset your TV card has, use the lspci command.
An example of such output for a Bt8x8 card might look similar to the following:
0000:02:0a.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 02)
0000:02:0a.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture
(rev 02) |
A list of hardware (mostly PCI cards) compatible with the Bttv driver is found in Appendix B