[vdr] No Audio on ATSC Qam256 or OTA..

Stile stile93 at gmail.com
Wed Jun 24 01:09:00 CEST 2009

On Tue, Jun 23, 2009 at 12:43 PM, Rob Davis<rob at davis-family.info> wrote:
> Alex Lasnier wrote:
>> Rob Davis wrote:
>>> I have it normally connected to Comcast cable which should pipe through
>>> a bunch of FTV channels using QAM256. These I can see and hear in
>>> kaffeine with AC97 audio. However, in VDR it appears to change the pids
>>> automatically so that the audio stops working. If I manually change VDR
>>> to not auto update and put the APID in then it squeeks rather than
>>> works. However, streaming to mplayer using streamdev seems to work. (It
>>> does the same this with OTA channels too - although I can only get 4
>>> with a portable antenna.)
>> ATSC uses only AC-3 audio, so the Apid should be 0 and the Dpid needs to
>> be set appropriately. Since the sound squeaks, whatever value you have
>> set for the Apid should be the Dpid.
>> For example,
>> WIFR-Wx:495000:M256:C:0:1984:0;Dpid:0:0:2:0:0:0
> Perfect... Thanks
> Is there a way to keep auto update on, but stop Comcast from sending
> wrong pids?  It keeps settings all audio options to 0 and some vpids too?

The streamtype for those AC3 PIDs is 0x81. Adding this to pat.c will
add the digital PIDs correctly.

--- pat.c~	2009-06-22 12:28:08.000000000 -0400
+++ pat.c	2009-06-22 13:32:48.461538560 -0400
@@ -432,6 +432,9 @@
+                case 0x81:             // AC3 DPIDs
+                     Dpids[NumDpids++] = stream.getPid();
+                     break;
               //default: printf("PID: %5d %5d %2d %3d %3d\n",
pmt.getServiceId(), stream.getPid(), stream.getStreamType(),
pmt.getVersionNumber(), Channel->Number());//XXX
             for (SI::Loop::Iterator it; (d =
SI::CaDescriptorTag)); ) {

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