From: Hartmut Hackmann <hartmut.hackmann@t-online.de>
To: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: video4linux-list@redhat.com
Subject: Re: Card Asus P7131 hybrid > no signal
Date: Sun, 04 May 2008 22:50:36 +0200 [thread overview]
Message-ID: <481E219C.50008@t-online.de> (raw)
In-Reply-To: <20080430202547.1765d34c@gaivota>
Hi, Mauro
Mauro Carvalho Chehab schrieb:
>> We have definitely issues on analog, but I can't test SECAM_L.
>>
>> After ioctl2 conversion, the apps don't let the user select specific
>> subnorms like PAL_I, PAL_BG, PAL_DK and SECAM_L, SECAM_DK, SECAM_Lc
>> anymore.
>
> Seems to be an issue at the userspace app. SAA7134_NORMS define a mask of supported
> norms. STD_PAL covers all the above PAL_foo. Also, SECAM covers all the above
> SECAM_foo.
>
> If the userspace app sets V4L2_STD_PAL, the driver should run on autodetection
> mode. If, otherwise, the app sets V4L2_STD_PAL_I, the driver will accept and
> select PAL_I only.
>
>> Internally the driver knows about all norms, but we have a clear
>> breakage of application backward compatibility and might see various
>> side effects. Especially, but not only for SECAM, it was important that
>> the users can select the exact norm themselves because of audio carrier
>> detection issues.
>
It is not only Audio carrier selection:
SECAM-L is the only standard with positive modulation of the vision carrier.
The tuner needs to know this. So in the case of SECAM-L, we need the *exact*
standard.
The insmod option secam=l transfers the exact standard to the tuner.
By the way: I just noticed this: If saa713x does not identify the color system
(improperly forced), tvtime will say "no signal"
>> It is firstly on 2.6.25.
>>
>> If you are affected, apps like xawtv or mplayer will only report these
>> TV standards.
>
> It shouldn't be hard to make enum_std to send all possible supported formats.
> Maybe this could be good for the apps you've mentioned.
>
> In this case, a patch to videodev.c should replace the code after case
> VIDIOC_ENUMSTD to another one that would report the individual standards, plus
> the grouped ones.
>
> Cheers,
> Mauro
>
Best regards
Hartmut
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next prev parent reply other threads:[~2008-05-04 20:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-28 18:29 Card Asus P7131 hybrid > no signal mahakali
[not found] ` <alpine.DEB.1.00.0804282103010.22981@sandbox.cz>
2008-04-29 19:21 ` mahakali
2008-04-29 22:15 ` hermann pitton
2008-04-30 4:44 ` mahakali
2008-04-30 15:58 ` mahakali
2008-04-30 21:56 ` hermann pitton
2008-04-30 23:25 ` Mauro Carvalho Chehab
2008-05-01 2:25 ` hermann pitton
2008-05-04 20:50 ` Hartmut Hackmann [this message]
2008-05-04 23:01 ` hermann pitton
2008-05-01 5:58 ` mahakali
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