[vdr] Re: [PATCH] AC3overDVB 0.1.0

["Reinhard Walter Buchner" <rw.buchner@freenet.de>]

Hi Stefan,

> > I applied your patch (VDR & DVD) to two versions:

> > Vanilla VDR 1.1.21 with the new cii driver
> > zcat auto patch
 
> What is this "zcat auto" patch?
> Please try with a real vanilla version...

Simply, I didn't do it by hand (as on my modded version)
but used the zcat patch command ;o)) It is (was before
your patch)  a real vanilla VDR. Due to my mods to 1.1.17
I didn't want to run the patch (don't trust computers ;o)),
so I did it by hand. As you designed the patch for 1.1.21
of course I "did" trust the computer on this one.

> > - Live viewing of movies works fine in either DD or normal mode.
 
> Which is very suprising, as my patch doesn't allows LiveAC3 yet
> (except views via transfer mode).

I tried so many combos ;o)) but I'll try it again just to be sure.
I'll have to find a Pro-7 movie which uses DD. But I DO know that
in the case mentioned above I could switch between DD & stereo
via the language button. Audio levels and delay where slightly
different during the switch, so I do know that VDR was actually
switching between two different things. I could hear both perfectly
and the amp was switching between normal & DD.

As the behavior ist the same for 1.1.17 mod & 1.1.21 it can't
be VDR (meaning something needed maybe mising in 1.1.17)

> Let mes ask just to be sure: your DD receiver is connected to the
> digital out of the DVB card (not connected to a soundcard)? And
> you're not using "-a" when calling vdr?

Absolutely correct (as I said digi out in both coax & opto with the
same results). I never got my sound card to work with the -a
command, so its not even connected to the amp input which is
running the DVB ;o))

> > When I try the above "can'ts" I get a noise similar to white
> > noise except it's in a staccato mode. It seems to me that
> 
> The noise you're hear, is the raw digital AC3 data played as PCM
> audio. This indicates that your DD receiver doesn't detected the
> encapsulated data.

Thats clear, but as mentioned there is NO DD data in the "don't
work" cases (except for the one recording, which as far as I know
SHOULD contain DD data). Pure DD DVDs playback just fine, so
it shouldn't be my amp that is causing the problem. As I said:

> > your mods are trying to encapsulate audio even where they
> > shouldn't be doing this.

> Well, I can say one thing. The patch only encapsulates data from
> the private stream, "normal" audio packets are not touched (to ge
> exact, they are removed from the stream when a private stream is
> available).

I'll have to investigate this further. Will try your debug thoughts.
Maybe your mod is removing streams where it should not be, so
all that is left is the capsule data ;o)) Obviously you couldn't blame
the amp for that.

> message on console every time a DD packet is detected and
> encapsulated.

I forgot to mention that I get messages (from mind, as I am not
in front of VDR right now) on theVDR tty: error stream 1800
!= 1899 (example). Will log the true output next time. As far as
I remember this ONLY occurs in the non DD audio cases. VDR
remains quiet during DD DVD playback (other than the messages
from libdvdnav that is)

> > Falling back on analog audio in the cases of not working doesn't
> > help.

> It's a feature. Analog audio out cannot be used together with
> AC3overDVB.

Hmm,  I'll have to give your mod a thorough look at, but I think
if one turns off DD / DTS in the setup VDR should behave exactly
as a vanilla VDR (and use the vanilla routines). I know this is 
difficult to do sometimes. I'm running into this problem all the
time adding my mods ;o))


Greetz,
Reinhard



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