Mailing List Archive

On Thu, Jul 24, 2003 at 05:36:28PM -0700, Steven J. Finnegan wrote:
> What did you have to change to get two-PVR-250's to work?
> (I have a PVR-250 and a PVR-350 in the same backend.

Actually, the only change I have made was to significantly increase a
buffer size and number of mpg_buffers in ivtv.

Note: don't increase the buffer size. The ivtv developers say it will
crash when capturing raw video if the size is changed. I only capture
mpeg, so I don't care, but ymmv. To be safe, just increase your number
of buffers using the instructions below. If you still want to mess with
dma_buffer_size, look in ivtv.h for "#define IVTV_DMA_BUF_SIZE". The
comment shows two values. Change to the bigger number, recompile,
install.

I increased the maximum number of buffers (it's just a check at load time)
available. You can have up to 100 by default (you add an option in
modules.conf):

options ivtv mpg_buffers=100

but with two cards I needed more to prevent the "Not enough free buffers"
messages. Look for this line in ivtv-driver.c:

if ((mpg_buffers > 100) || (mpg_buffers < 15)) {

and change the 100 to a bigger number. Recompile and install. Then change
modules.conf to use the new number. I suspect 128 would be enough, but
again, ymmv.

----

Now, if I can just get someone to answer how to set options on the card(s)
at capture time (in myth), I'll be totally set (how do I set hue,
brightness, contrast, etc. on the card before each capture?).

Enjoy!

Russ

On Friday 25 July 2003 11:06 am, Russ Southern wrote:
> Now, if I can just get someone to answer how to set options on the card(s)
> at capture time (in myth), I'll be totally set (how do I set hue,
> brightness, contrast, etc. on the card before each capture?).

picture controls (hue, constrast, brightness, color) are all set on a
per-channel basis, and are stored in the channels table (fixed scale of
0-65535, translated into the actual scale when they're actually set).

The other controls (mpeg settings, etc) are waiting on me or someone else to
get around to a better recording profile system that handles different types
of cards better.

Isaac
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On Fri, Jul 25, 2003 at 11:13:07AM -0400, Isaac Richards wrote:
> On Friday 25 July 2003 11:06 am, Russ Southern wrote:
> > Now, if I can just get someone to answer how to set options on the card(s)
> > at capture time (in myth), I'll be totally set (how do I set hue,
> > brightness, contrast, etc. on the card before each capture?).
>
> picture controls (hue, constrast, brightness, color) are all set on a
> per-channel basis, and are stored in the channels table (fixed scale of
> 0-65535, translated into the actual scale when they're actually set).

Ah, I see. So, having watched live tv and set options on that channel, it
will automagically keep that when recording later? Nice. Thank you (even
if it isn't automagic, I can set all the channels anyway).

> The other controls (mpeg settings, etc) are waiting on me or someone else to
> get around to a better recording profile system that handles different types
> of cards better.

I'd love to contribute, but probably need a less ambitious starting point.
I know this topic came up recently, but do you have any TODO suggestions?

Russ