[mythtv-commits] Ticket #1100: Firewire captures create corrupt stream, test-mpeg2 captures fine

[MythTV]

#1100: Firewire captures create corrupt stream, test-mpeg2 captures fine
------------------------------+---------------------------------------------
 Reporter:  adeffs at gmail.com  |       Owner:  ijr
     Type:  defect            |      Status:  new
 Priority:  minor             |   Milestone:     
Component:  mythtv            |     Version:     
 Severity:  medium            |  
------------------------------+---------------------------------------------
 With Jim Westfall's help I've yet get a 0bit firewire recording, its
 worked
 everytime. What I notice though is a lot of glitches in the capture.
 Sample
 log output:
 2006-01-19 14:46:12.625 audio waiting for space on soundcard: have 2752
 need
 6144
 [mpeg2video @ 0x2aaaabffa4c0]MPEG motion vector out of boundary
 [mpeg2video @ 0x2aaaabffa4c0]MPEG motion vector out of boundary
 [mpeg2video @ 0x2aaaabffa4c0]Warning MVs not available
 [mpeg2video @ 0x2aaaabffa4c0]concealing 4265 DC, 4265 AC, 4265 MV errors
 2006-01-19 14:46:12.640 audio waiting for space on soundcard: have 5760
 need
 6144

 depending on the glitch, I may receive between 4-40+ lines like this every
 2minutes or so.

 As an experiement, I ran a test-mpeg2 capture on the same channel (though
 the
 channel doesn't matter), grabbed 1.8GB and played through the internal
 player
 using MythVideo. This method results in a glitch free capture for the
 17mins
 of video.

 For MythTV I have the Firewire port set to record via "broadcast",
 previously
 I had it set to "p2p" as it is what worked when testing with test-mpeg2.

 Here's my plugreport for the capture from test-mpeg2:
 Node 2 GUID 0x000e5cfffed720aa
 ------------------------------
 oMPR n_plugs=1, data_rate=2, bcast_channel=63
 oPCR[0] online=1, bcast_connection=0, n_p2p_connections=1
 channel=63, data_rate=2, overhead_id=0, payload=376
 iMPR n_plugs=0, data_rate=2

 So then I tried switching mythtv-setup back to a p2p connection to see if
 that
 fixes the glitches, but it still gets the glitches and doesn't alway get a
 stream, even though test-mpeg2 always gets a stream with p2p=1.

 Now I've got mythtv-setup back to broadcast and its working like it was
 before, and for kicks did another test-mpeg2 capture this time on another
 channel, another 1.2GB and again using the internal player I get no
 glitches
 playing it back (verified by a search through the frontend log).

 so it looks like somethings wrong with how MythTV captures via the
 firewire.

-- 
Ticket URL: <http://svn.mythtv.org/trac/ticket/1100>
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