Robert Suetterlin wrote:
>
> Hello everyone,
>
> I already applied with this problem and already got an answer
> which (of course :) did not satisfy me fully.
>
> Again: My problem is, that my bttv (card? driver? whatever?) drops
> first fields. So when I grab a field the dirver? knows it must grab
> two fields and grabs the second fields of consecutive frames. It could
> also be that it grabs field two of frame x and field one of frame x+1.
> I have two problems: 1) How can I diagnose/detect this
> error easily (i.e. should I measure the time it takes to grab fields,
First half of first line of top field is black, same second half of last
line of bottom field (at least in PAL). Also the framerate will be half in
this situation, so time measuring should detect this.
> is there an ioctl, or do I have to change to vl4-two, ...)?
> 2) Is this a general or known problem with other people and
> how can I fix it?
Never noticed this, but im using bttv-v4l2. Even Justin says it is worse, I
suggest you give it a try.
> Point two was already answered in the following way: Try all
> bttv-cards and see if the error vanishes with one of them. Point one
> was hinted to: try v4l-two, this allows for example to grab single
> fields.
>
> These answers did not satisfy me fully as I already stated above, but
> still there were some hints. And I have a few more refined questions.
> Trying every one of the 40-something drivercards is not such a good
> idea in my opinion, what is the big difference anyway? Number of
> composite or svhs connectors, does the card have Teletext or not, or an
> radio reciever...
> So question one: What is the difference in card-type, can I
> define a new card-type (and how), should I look this up in the source
> code myself?
The incorrect tunner type could be the reason (probably not, but who can be
sure) and I had bad times with the bttv forcing autodetected tuner over
explicitly specified.
> And two: Is it advisable to change to v4l-two (as it allows
> better diagnostics, or why?), how to do it, or where to get information
> on this?
http://bttv-v4l2.sourceforge.net for 2.2 version, mail me for 2.4.
--
Marian Jančár <[EMAIL PROTECTED]>
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