[mythtv-users] SA3250HD Firewire: test-mpeg2 good, mythtv bad

[Steven Adeff]

On 7/21/06, John P Poet <jppoet at gmail.com> wrote:
> Using test-mpeg2 I can capture video from my SA3250HD cable box.  It
> has an occasional minor glitch in the form of some pixelization, but
> generally looks pretty good.
>
> Using MythTV I can capture video from my SA3250HD cable box.  It is
> *HEAVILY* pixelated, and will barely play.  It is so bad that if
> mythcommflag tries to run on it, it will crash the whole mythbackend
> process.
>
> I tried "importing" the capture made using test-mpeg2 into myth, and
> myth will play it just fine.
>
> I have tried using both p2p and broadcast.  As far as I can tell,
> broadcast does not work at all, even with test-mpeg2.
>
> plugreport output:
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Host Adapter 0
> ==============
>
> Node 0 GUID 0x0011e69faf160000
> ------------------------------
> oMPR n_plugs=1, data_rate=2, bcast_channel=63
> oPCR[0] online=1, bcast_connection=0, n_p2p_connections=4
>         channel=0, data_rate=2, overhead_id=0, payload=146
> iMPR n_plugs=0, data_rate=2
>
> Node 1 GUID 0x0011d80000303a86
> ------------------------------
> libiec61883 error: error reading oMPR
> libiec61883 error: error reading iMPR
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> While test-mpeg2 works, I am confused about plugctl.  For example:
>
> plugctl -n 0 oPCR\[0\].data_rate=3
>
> Does not seem to have any effect based on the output from plugreport.
>
>
> I noticed that the "n_p2p_connections" gets bumped every time
> mythbackend starts up.
>
> I also noticed that while myth is trying to capture input via firewire
> I get a constant stream of:
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:17 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> Jul 21 18:53:17 topaz kernel:
> Jul 21 18:53:18 topaz kernel: ohci1394: fw-host0: IR DMA error - OHCI
> error code 0x05
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> In my /var/log/messages file.  This does *not* happen when using test-mpeg2.
>
> In my mythbacked.log file, I get a constant stream of:
>
>     TS packet out of sync.
>
> error messages.  If I use VLC to watch the capture from test-mpeg2, I
> get a lot of
>
>     libdvbpsi error (PSI decoder): TS discontinuity (received 0,
> expected 15) for PID 0
>
> but the video plays just fine (with the rare pixelization).
>
> I am running Fedora Core 5 with a 2.6.15.7 Kernel.  I have tried
> patching linux/drivers/ieee1394/dma.c but it did not help.
>
> I use some HD3000 cards, and have no problems with them.
>
> Anyone have an recommendations?  Should I buy a PCI firewire card?
> Why does test-mpeg2 work, but myth has problems?
>
> Thanks,

does your cpu usage spike during recording?

-- 
Steve
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