Re: KWorld ATSC 115 all static

[CityK <cityk@rogers.com>]

hermann pitton wrote:
> Am Dienstag, den 03.02.2009, 01:03 -0500 schrieb CityK:
>   
>> - Mauro created a patch intended to be applied against mainline ... I
>> tested and analog tv did NOT work
>>     
>
> strange, that we don't see at least some error messages.
>   

Indeed, on a quick glance, the output looks entirely indifferent

hermann pitton wrote:
> I had a quick test on the in kernel radeon driver on Fedora 10 and
> recent 2.6.27 with xawtv-3.95.
> True is, that overlay-preview yields dga is not supported, but with
> current v4l-dvb master and Hans' conversions mmap/grabdisplay works with
> the old "xawtv -v 1 -nodga -remote -c /dev/video2" something.
>   
Yep, as I menitoned: 
http://www.mail-archive.com/linux-media@vger.kernel.org/msg00989.html. 
In regards the hit and miss functionality I mentioned with kdetv, the
pattern was simple:  grabdisplay v4l1 mode would work only after having
just used tvtime.  Similarly, in the v4l2 mode, after having just used
tvtime, one can observe a momentary flicker of video (i.e. lasting only
a few hundredths of a second) from a channel before it reverted to all
static.

Additionally, when the apps fail in overlay mode, and are displaying all
static, you can actually simultaneously open up one of the digital apps
(take your pick; kaffeine, MPlayer...) and successfully watch dvb.

hermann pitton wrote:
> Like you, I can't imagine that the earlier Kworld ATSC 110/15
> initialization in Hans' kworld repo could be related to it.
>   

No, no -- Mauro doubts it.  I,  on the other hand, suspect that there
has been something innocuous introduced  within the new v4l2 framework
that is causing this.

hermann pitton wrote:
> I can test on nv drivers as well next, they might have dropped support for it too and just the x capabilies should be reported.

Nope -- as I mentioned, dropping back to a snapshot from roughly 3 weeks
ago and applying Mike's patch works with both the nv and nvidia driver,
hence disproving that it is anything X related. 


>> - Mainline v4l-dvb:
>> Pros: none ... you will achieve this thread's namesake -- all static.
>> Cons: since the code from Hans' v4l-dvb-saa7134 repo was merged, Mike's
>> hack/workaround patch has been rendered ineffective for good. Mauro's
>> later patch was also pulled into mainline, but it does not change the
>> situation analog tv (and I do not mean in relation to Mike's patch, I
>> mean precisely upon its own).
>>
>> - Mike's hack/workaround patch
>> Pros: it will apply and work with snapshots of v4l-dvb up to probably ~
>> Jan 15th or so. All the apps that I tested with work as expected.
>> Cons: in order to use analog tv, upon each boot, one must do what I
>> termed being a dance with unloading and reloading the tuner module via
>> modprobe.
>>     
>
> I'm not sure if we even have the status of all devices potentially
> seeing impacts, but reloading modules becomes more difficult, since we
> load now saa7134-alsa by default. This will cause that apps like mixers
> on runlevel 5 need to be closed before you can unload/reload
> saa7134-alsa and saa7134 and then further any tuner modules.
>
> This is fine for all the cards without such problems, but else one must
> be aware off. With "options saa7134 alsa=0" the old behaviour is
> restored.
>
> Mauro also disabled saa7134-alsa support on saa7130 devices, which
> simply do not support it and the deprecated saa7134-oss. Thanks! 
>   

And speaking of alsa:

CityK wrote (Jan 19th):
> Some Other Miscellanea:
>
> 2) This is likely related to the discussion about the gate -- after
> closing the analog TV app, the audio from the last channel being viewed
> can still be heard if one turns up the volume on their system.  This
> leakage has always been present.  But given that we are addressing this
> issue now, it strikes me that the gate is being kept open on the audio
> line after application closing/release occurs.
>   

This issue seems to have been resolved since having updated to the ALSA
1.0.19 release from a couple of weeks ago (which literally contained a
zillion fixes, so I'm not going to bother trying to figure out which one
might have been the fix)..