[vdr] Re: VDR-1.3.19 : DD-Audio stuttering when switching betweenPro7 and Sat1

[Chad Flynt <hoochster@sofnet.com>]

From the discussions that have been mentioned about this issue and my 
issues with particular DD Decoders, the consensus was possibly due to a 
ring buffer issue.  Well Cym seemed to find the area that is in 
question, and we experimented with a patch.  This has made a 99% 
improvement, just by doubling the ring buffer.  I have had 1 and ONLY 1 
instance of a brief stutter since, and I am sure if I increased it a 
little more it might fix that but hesitant to change any more till I 
notice a major problem.  So try as you might, thanks a ton goes out to 
Cym for finding the area and Christian I believe is who came up with the 
thought.  But I am definately running standard memory on my FF card, I 
have not upgraded it.

diff -ruN vdr-1.3.20/transfer.c vdr-1.3.20.transfer/transfer.c
--- transfer.c  2005-02-08 08:28:38.000000000 -0600
+++ transfer.c  2005-02-08 08:36:42.000000000 -0600
@@ -80,7 +80,7 @@
           //XXX To resolve this, the remuxer or PlayPes() should 
synchronize
           //XXX audio with the video frames. 2004/09/09 Werner
           if (!GotBufferReserve) {
-              if (ringBuffer->Available() < 3 * KILOBYTE(192) / 2) { // 
used to be MAXFRAMESIZE, but the HDTV value of KILOBYTE(512) is way too 
much here
+              if (ringBuffer->Available() < 3 * KILOBYTE(384) / 2) { // 
used to be MAXFRAMESIZE, but the HDTV value of KILOBYTE(512) is way too 
much here
                 cCondWait::SleepMs(20); // allow the buffer to collect 
some reserve
                 continue;
                 }


Good Luck,

Chad


Klaus Schmidinger wrote:

> christian jacobsen wrote:
>
> > Hallo,
> >
> > I noticed that when enabling DD on Pro7 and then switching directly 
> > to Sat1 then audio is stuttering. If I switch to Pro7, then RTL2 and 
> > then Sat1 then DD sound is OK (have to wait for picture to come on 
> > RTL2).
> > All tests on Vanilla VDR 1.3.19 !
> >
> > How to reproduce (always wait for picture and sound) :
> > 1. start on RTL.
> > 2. swith to sat1, then RTL2 and Pro7.
> > 3. Enable DD in Audiomenü (on Pro7)
> > 4. switch directly to Sat1 (press 5 on my channels.conf)
> >
> > Now sound is stuttering on my maschine.
> >
> > If I do this instead :
> >
> > 4. switch to RTL2
> > 5. switch to Sat1
> >
> > Sound is OK.
> >
> > Here the channels.conf for this test :
> > Das Erste;ARD:11837:hC34:S19.2E:27500:101:102=deu:104:0:28106:1:1101:0
> > ZDF;ZDFvision:11954:hC34:S19.2E:27500:110:120=deu,121=2ch;125=dd:130:0:28006:1:1 
> > 079:0
> > NDR FS 
> > MV;ARD:12110:hC34:S19.2E:27500:2401:2402=deu:2404:0:28224:1:1073:0
> > RTL Television,RTL;RTL 
> > World:12188:hC34:S19.2E:27500:163:104=deu:105:0:12003:1:1
> > 089:0
> > SAT.1;ProSiebenSat.1:12480:vC34:S19.2E:27500:1791:1792=deu;1795=deu:34:0:46:133: 
> > 33:0
> > RTL2;RTL World:12188:hC34:S19.2E:27500:166:128=deu:68:0:12020:1:1089:0
> > ProSieben;ProSiebenSat.1:12480:vC34:S19.2E:27500:255:256=deu;257=deu:32:0:898:13 
> > 3:33:0
> >
> > Greetings
> > Christian Jacobsen
>
> I tried this here but had no such effect.
> But then again I'm already a little further than 1.3.19, so please
> try this again with version 1.3.20.
>
> Klaus
diff -ruN vdr-1.3.20/transfer.c vdr-1.3.20.transfer/transfer.c
--- transfer.c	2005-02-08 08:28:38.000000000 -0600
+++ transfer.c	2005-02-08 08:36:42.000000000 -0600
@@ -80,7 +80,7 @@
            //XXX To resolve this, the remuxer or PlayPes() should synchronize
            //XXX audio with the video frames. 2004/09/09 Werner
            if (!GotBufferReserve) {
-              if (ringBuffer->Available() < 3 * KILOBYTE(192) / 2) { // used to be MAXFRAMESIZE, but the HDTV value of KILOBYTE(512) is way too much here
+              if (ringBuffer->Available() < 3 * KILOBYTE(384) / 2) { // used to be MAXFRAMESIZE, but the HDTV value of KILOBYTE(512) is way too much here
                  cCondWait::SleepMs(20); // allow the buffer to collect some reserve
                  continue;
                  }