On Wed, 2016-03-23 at 15:45 -0400, m.roth@5-cent.us wrote:
Phil Wyett wrote:
On Wed, 2016-03-23 at 15:16 -0400, m.roth@5-cent.us wrote:
Phil Wyett wrote:
On Wed, 2016-03-23 at 10:26 -0400, m.roth@5-cent.us wrote:
<snip> >> > >> > What is the make/model of the card? >> lspci says: >> Brooktree Corporation Bt878 Audio Capture (rev 11) >> > >> > Are you supplying options when loading the bttv module? >> >> On and off, I've been googling to find if there's something I can tell >> it,or the kernel on boot. Currently, I have, in /etc/modprobe.d/bttv: >> options i2c-algo-bit bit_test=1 >> options bttv gbuffers=16 card=98,98,98,98,98,98,98,98 >> radio=0,0,0,0,0,0,0,0 tuner=4,4,4,4,4,4,4,4 chroma_agc=1 combfilter=2 >> full_luma_range=1 coring=1 > > The options line 1 is used widely and only worth changing if all else > fails. > > The second options line option of combfilter by docs indicate there is > no 2 option and is enabled by default, so you can remove that option to > test. > > I would enable two possible compatibility options and see if that helps. > > triton1=0/1 - for Triton1 (+others) compatibility. > > vsfx=0/1 - yet another chipset bug compatibility bit > > The triton1 insmod option sets the EN_TBFX bit in the control register. > The vsfx insmod option does the same for EN_VSFX bit. If you have > stability problems you can try if one of these options makes your box > work solid. > > Source: http://xawdecode.sourceforge.net/aideUS/htmlpage/BTTV-param.htm >
Ok, I've been doing some research, partly refreshing my memory, since we bought these 2-3 years ago. As you note, above, it *says* it's an iTuner Spectra8; *however*, when I look at bttv-cards.c, what I see is that *it* thinks that such a card has *one* video and one audio. In fact, this is a Bt878, and it has *four* inputs for each, with four chips on the card, one for each channel. The nearest thing to it *appears* to be a Provideo PV150, card=98 (which is why I have that card= line in the bttv.conf).
Now that I'm thinking about it, and while googling, I looked for the provideo 150, and what *should* have been the link took me to one for a provideo 950, with *16* inputs. Does anyone have opinions on:
- should I change the card-, radio=, and tuner= to only have four,
instead of 8, values? I realize that it multiplexes for 8, but.... 2. What is "coring"?
markHi Mark,
It did specify spectra 8 in your lspci output. Below is product page.
http://www.ituner.com/spectra.htm
In my research I did find this related page.
http://www.linuxconsulting.ro/spectra8/
This does state that with latest internal driver, it is detected and works as the ProVision 150. The card=98,... is correct.
The matter of reducing all the settings to 4 rather than 8 may help.
coring is a luma setting. See:
https://www.linuxtv.org/wiki/index.php/Bttv#insmod_Options
Not sure and someone else maybe can shed better light on the setting. By default it is disabled and I would tend to think it can be removed.
Any thoughts on the number of buffers?
mark
Hi Mark,
You have the setting of 16 which maybe correct for how many feeds you are taking/processing. If less I maybe tempted to drop it to the default 8. If the device is running as close to or at default and no hickups - all the better. :-)
Regards
Phil