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[kpl388 <1002806@xxxxxxxxxxxxxxxxxx>]

Thanks for the suggestion. Unfortunately, that solution didn't work for me... 
The model number for my box (0x0000d330) was already listed in the 6200ch.c file. To be sure, I downloaded the version from the 6200ch wiki, built it, and set mythtv to call it. But, I get the same results: I am able to change channels successfully once (as before), but when I try to change a second time, the channel changes on the cable box, but the backend crashes. Is this the same problem you were having (one successful change, then backend crash on the second)? 

I also tried shutting down and disconnecting the computer and cable box,
then restarting and reconnecting them (as suggested in the mythtv
firewire wiki). This caused the cable box show up on a different node (0
instead of 1), but otherwise did not change things.

My naive guess is that my problem is related to how the mpeg stream is
being processed, rather than a firewire issue, but that is based only on
where the program crashes.

Thanks again for sharing.

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https://bugs.launchpad.net/bugs/1002806

Title:
  backend crash after second firewire channel change while watching
  livetv

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  After upgrading to 0.25, I am experience reliable backend crashes when
  using my dch-3200 cable box connected via firewire. The following
  sequence triggers a backend crash every time:

  1. Start watching livetv on firewire input 
  2. Change channel (first channel change works fine)
  3. Change channel again (now backend crashes)

  I believe this problem is present with scheduled recordings as well,
  as I have had a few missed recordings on the firewire input (but most
  of my recordings are on my HVR-1600 QAM tuner, so I am not certain -
  happy to test)

  When the crash happens, mythfrontend reports an "irrecoverable
  recorder error" and the backend restarts (actually appears to restart
  a couple of times?)

  I am using the 0.25-fixes branch of the mythbuntu repos and Ubuntu
  12.04

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: mythtv-backend 2:0.25.0+fixes.20120520.b5b4c48-0ubuntu0mythbuntu4 [origin: LP-PPA-mythbuntu-0.25]
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  .var.log.mythtv.mtd.log:
   mtd started at Thu Mar 17 08:09:42 2011
   mtd is running on a host called kmedia-myth
   08:09:42: Waiting for connections/jobs
   08:09:42: mtd is listening on port 2442
  .var.log.mythtv.mythavtest.log:
   
  .var.log.mythtv.mythccextractor.log:
   
  .var.log.mythtv.mythjobqueue.log:
   
  .var.log.mythtv.mythlcdserver.log:
   
  .var.log.mythtv.mythmediaserver.log:
   
  .var.log.mythtv.mythshutdown.log:
   
  .var.log.mythtv.mythutil.log:
   
  .var.log.mythtv.mythwelcome.log:
   
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AssertionMessage: mythbackend: mpeg2.c:113: mpeg2_recv_handler: Assertion `mpeg != ((void *)0)' failed.
  CrashCounter: 1
  CrashDB: mythbuntu
  Date: Tue May 22 07:14:59 2012
  ExecutablePath: /usr/bin/mythbackend
  InstallationMedia: Mythbuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  Installed_mythtv_dbg: 2:0.25.0+fixes.20120520.b5b4c48-0ubuntu0mythbuntu4
  LocalLibraries: /usr/local/lib/libraw1394.so.11.0.1
  ProcCmdline: /usr/bin/mythbackend --syslog local7 --user mythtv
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  Signal: 6
  SourcePackage: mythtv
  StacktraceTop:
   __assert_fail_base (fmt=<optimized out>, assertion=0x7f909e124cf0 "mpeg != ((void *)0)", file=0x7f909e124ce8 "mpeg2.c", line=<optimized out>, function=<optimized out>) at assert.c:94
   __GI___assert_fail (assertion=0x7f909e124cf0 "mpeg != ((void *)0)", file=0x7f909e124ce8 "mpeg2.c", line=113, function=0x7f909e124d60 "mpeg2_recv_handler") at assert.c:103
   ?? () from /usr/lib/x86_64-linux-gnu/libiec61883.so.0
   flush_recv_packets (interrupt=<optimized out>, handle=<optimized out>) at fw-iso.c:220
   handle_iso_event (handle=0x1341450, closure=<optimized out>, events=<optimized out>) at fw-iso.c:318
  Title: mythbackend assert failure: mythbackend: mpeg2.c:113: mpeg2_recv_handler: Assertion `mpeg != ((void *)0)' failed.
  UpgradeStatus: Upgraded to precise on 2012-05-01 (20 days ago)
  UserGroups: audio cdrom dialout video

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