Mailing List Archive: MythTV: Users

Fwd: Mythtv - black screen when trying to watch tv on computer

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binaryflow at gmail

Apr 1, 2007, 7:15 AM

Post #1 of 2 (858 views)
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Fwd: Mythtv - black screen when trying to watch tv on computer

Hello everyone, new user here. I have set up a Mythtv box running Mandriva
2007 and using a Hauppage PVR 350 capture card. I have my cable line
running directly into the tv input on the card. The card appears to
initialize properly upon boot (see below). I can run cat /dev/video0 >
test.mpg and watch good video/audio in kafffeine. In Mythtv I can connect
to the backend database, run mythfilldatabase and scan channels for Tuner
1. When I try to watch tv or record a program all I get is a black screen.
The watch tv option goes black for three seconds and then exits. I am using
a 20" flat panel monitor that the computer is plugged directly into. I can
see the desktop on the monitor and would like to watch tv on top of kde (not
using tv out). When I pick something out of the channel guide it records
but mythtv says that it doesn't exist in the play back screens. I can see
the video in the /home/recordings directory. Very strange. Has anyone seen
this kind of behavior before? What am I doing wrong? I appreciate any
suggestions.

[root [at] mytht douglas]# dmesg | grep ivtv
ivtv: ==================== START INIT IVTV ====================
ivtv: version 0.7.0 (tagged release) loading
ivtv: Linux version: 2.6.17-5mdv SMP mod_unload 686 gcc-4.1
ivtv: In case of problems please include the debug info between
ivtv: the START INIT IVTV and END INIT IVTV lines, along with
ivtv: any module options, when mailing the ivtv-users mailinglist.
ivtv0: Autodetected Hauppauge WinTV PVR-350 card (cx23415 based)
ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
tuner 0-0061: chip found @ 0xc2 (ivtv i2c driver #0)
tda9887 0-0043: chip found @ 0x86 (ivtv i2c driver #0)
saa7115 0-0021: saa7115 found @ 0x42 (ivtv i2c driver #0)
saa7127 0-0044: saa7129 found @ 0x88 (ivtv i2c driver #0)
msp3400 0-0040: MSP4448G-A2 found @ 0x80 (ivtv i2c driver #0)
ivtv0: loaded v4l-cx2341x-enc.fw firmware (262144 bytes)
ivtv0: loaded v4l-cx2341x-dec.fw firmware (262144 bytes)
ivtv0: Encoder revision: 0x02050032
ivtv0: Decoder revision: 0x02020023
ivtv0: Allocate DMA encoder MPEG stream: 128 x 32768 buffers (4096KB total)
ivtv0: Allocate DMA encoder YUV stream: 194 x 10800 buffers (2048KB total)
ivtv0: Allocate DMA encoder VBI stream: 120 x 17472 buffers (2048KB total)
ivtv0: Allocate DMA encoder PCM audio stream: 455 x 4608 buffers (2048KB
total)
ivtv0: Create encoder radio stream
ivtv0: Allocate DMA decoder MPEG stream: 16 x 65536 buffers (1024KB total)
ivtv0: Allocate DMA decoder VBI stream: 512 x 2048 buffers (1024KB total)
ivtv0: Create decoder VOUT stream
ivtv0: Allocate DMA decoder YUV stream: 24 x 43200 buffers (1024KB total)
ivtv0: loaded v4l-cx2341x-init.mpg firmware (155648 bytes)
ivtv0: Initialized Hauppauge WinTV PVR-350, card #0
ivtv: ==================== END INIT IVTV ====================

mtdean at thirdcontact

Apr 2, 2007, 5:52 AM

Post #2 of 2 (752 views)
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Re: Fwd: Mythtv - black screen when trying to watch tv on computer [In reply to]

On 04/01/2007 04:18 PM, Douglas Ward wrote:
> On 4/1/07, Michael T. Dean <mtdean [at] thirdcontact> wrote:
>> On 04/01/2007 10:15 AM, Douglas Ward wrote:
>>> I have set up a Mythtv box running Mandriva 2007 and using a
>>> Hauppage PVR 350 capture card.
...
>>> When I try to watch tv or record a program all I get is a black screen.
>> You've configured your system to use the PVR-350's hardware decoder.
>> This can /only/ be used with the PVR-350's TV out, so it won't work
>> with your system connected to a monitor. So, just disable, "Use the
>> PVR-350's TV out / MPEG decoder" and you'll be up and running.
...
>>> When I pick something out of the channel guide it records but mythtv
>>> says that it doesn't exist in the play back screens. I can see the
>>> video in the /home/recordings directory. Very strange.
>> http://www.mythtv.org/wiki/index.php/Frequently_Asked_Questions#Q:_Why_aren.27t_my_new_recordings_showing_up_in_Watch_Recordings.3F
>>
>>

BTW, this is a bottom- or inline-posting list. (
http://www.mythtv.org/wiki/index.php/Mailing_List_etiquette ) Other
people will find conversations easier to understand (making it more
likely for someone to jump in after I give you wrong info ;) if you
follow this approach.

> I followed your advice about rebuilding my channel list without
> channel scan.

Good. That will pay off in the future (i.e. fewer future problems). :)

> I did read that FAQ document and verified that my setup looks ok.

So you don't have any filters set and you're still not seeing any TV
shows? If so, chances are your frontend is looking at a different
database from your backend or having other database issues. Are you
using separate frontend (playback)/backend (recording) machines?

> I am still seeing about three seconds of black screen and then back to
> the myth frontend. They only place in mythtv that I can find that is
> in the transcoder section. The only option I can
> choose is hardware.

The option:

Use the PVR-350's TV out / MPEG decoder
MythTV can use the PVR-350's TV out and MPEG decoder for high quality
playback. This requires that the ivtv-fb kernel module is also loaded
and configured properly.

Is in mythfrontend settings--Utilities/Setup|Settings|TV
Settings|Playback Settings on page "Decoder Settigns" (somewhere around
page 6).

Mike
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