[mythtv] A/V Bug in CVS from 12:00am 3/27 to 12:00am 3/29

[Endaf Jones]

I wonder if this is the same thing I'm seeing for a few weeks regarding 
the slow motion and slow/skiping audio while watching PBS on AMC 3.  
Started happening about the same time...   It almost looks like the 
program is running at half-speed.  I beleive I see those same DVB errors 
as you do, but not the audio ones...

# Endaf

Greg Grotsky wrote:

>I've been trying to narrow down the issue with audio jitter and
>slow-mo video.  I've determined that it was broken in CVS sometime
>between 3/27/2005 and 3/29/2005.  I checked out CVS MythTV from
>3/27/2005 and it works for all channels, when I check it out from
>3/29/2005 (because 3/28 backend segfaults when entering livetv) two
>channels break.  The broken channels give me studdering audio (with
>occasional pops and clicks) and the video is very slow.  When I tune
>to a broken channel on the frontend I get lots of these:
>
>2005-04-15 13:01:33.664 Audio buffer overflow, audio data lost!
>2005-04-15 13:01:33.668 Audio buffer overflow, audio data lost!
>2005-04-15 13:01:33.668 Audio buffer overflow, audio data lost!
>
>And on the backend I get lots of these:
>
>2005-04-15 13:01:35.624 DVB#0 WARNING - Uncorrectable error in packet, dropped.
>2005-04-15 13:01:35.624 DVB#0 WARNING - Uncorrectable error in packet, dropped.
>2005-04-15 13:01:35.624 DVB#0 WARNING - Uncorrectable error in packet, dropped.
>
>Both channels work fine on CVS from 3/27 and earlier.  I looked
>through the CVS commits from 3/27-3/29 and I'm not sure but these (2)
>are the most relevant commits that I could find.
>
>----------------------------------------------------------------------------
>Changes committed by taylor on Sun Mar 27 18:18:56 2005
>
>Modified Files:
>   in mythtv/libs/libmythtv:
>        dbcheck.cpp siparser.cpp siscan.cpp sitypes.cpp sitypes.h 
>Log Message:
>Addition of Torbjorn Jansson's EitFixUp4 code changes that were missed
>in previous
>DVB patch changes.  One more entry added to dtv_privatetypes so one more
>schema rev.
>----------------------------------------------------------------------------
>----------------------------------------------------------------------------
>Changes committed by cpinkham on Mon Mar 28 05:01:39 2005
>
>Modified Files:
>   in mythtv/libs/libmythtv:
>        NuppelVideoPlayer.cpp NuppelVideoPlayer.h avformatdecoder.cpp 
>        decoderbase.cpp decoderbase.h 
>   in mythtv/programs/mythtranscode:
>        transcode.cpp 
>Log Message:
>
>Fix transcoding bug related to AC3 passthrough.  Previously if you had AC3
>passthrough turned on and tried to transcode an AC3 recording, the audio
>would not be properly transcoded.  This fixes the audio when AC3 passthrough
>is enabled.
>----------------------------------------------------------------------------
>
>I am using DVB with a pcHDTV HD-3000 card, on 32-bit Debian with a
>2.6.12-rc1 kernel (with built-in DVB), I am also using /dev/dsp for
>audio.  I used the same configure script with all versions of the CVS
>code that I checked out, and I dropped my database to guarantee
>identical settings.  Here is my output from configure that I am using:
>
>$ ./configure  --disable-audio-arts --disable-audio-jack
>--disable-firewire --disable-ivtv --enable-dvb
>--dvb-path=/usr/src/linux/include --enable-xvmc --enable-opengl-vsync
>Warning: DVB location points into kernel (ok if kernel >= 2.6.11)
># Basic Settings
>Compile type     release
>Compiler cache   no
>DistCC           no
>Install prefix   /usr/local
>CPU              x86 (model name        : AMD Athlon(tm) 64 Processor 3200+)
>Big Endian       no
>MMX enabled      yes
>Vector Builtins  no
>
># Input Support
>Joystick menu    yes
>lirc support     yes
>ivtv support     no
>FireWire support no
>DVB support      yes [/usr/src/linux/include]
>
># Sound Output Support
>OSS support      yes
>ALSA support     yes
>aRts support     no
>JACK support     no
>
># Video Output Support
>x11 support      yes
>xrandr support   yes
>xv support       yes
>XvMC support     yes
>XvMC VLD support no
>OpenGL vsync     yes
>
>Creating config.mak and config.h
>
>P.S. I have XvMC enabled in configure but I don't have it enabled in
>mythfrontend.
>
>Thanks,
>-Greg
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