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Corrupt NTSC captions with PVR-250 and ivtv > 0.10.1

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richardwoelk at yahoo

Sep 6, 2007, 7:06 PM

Post #1 of 4 (757 views)
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Corrupt NTSC captions with PVR-250 and ivtv > 0.10.1

Hello,
I've been searching for a solution to this for a while. I've been
using closed captions with Mythtv and my PVR250 since it started
supporting that option. After I upgraded to ivtv version 0.10.1, I get
extreme losses in the captioning, somtimes 5 to 10 letters are missing
from the sentence. I've even updated to the latest Fedora kernel 2.6.22
and IVTV version 1.0.0 and it is still a problem.

If I got back to IVTV version 0.10.0, then the captions work OK again,
but then my lirc_serial homebrew remote receiver has major repeat issues
while capturing.

I don't think it is a Mythtv problem, because I can watch shows recorded
with pre 0.10.1 and it plays it back OK. also, files recorded with cat
/dev/video0 > test.mpg have the same problem when played in mythtv.

here's my dmesg output.

ivtv: ==================== START INIT IVTV ====================
ivtv: version 1.0.0 (2.6.22.2-42.fc6 SMP mod_unload ) loading
ivtv0: Autodetected Hauppauge card (cx23416 based)
ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
ivtv0: loaded v4l-cx2341x-enc.fw firmware (-139636913516176 bytes)
ivtv0: Encoder revision: 0x02060039
tveeprom 2-0050: Hauppauge model 32032, rev B310, serial# 6983495
tveeprom 2-0050: tuner model is Philips FI1236 MK2 (idx 10, type 2)
tveeprom 2-0050: TV standards NTSC(M) (eeprom 0x08)
tveeprom 2-0050: audio processor is MSP4448 (idx 27)
tveeprom 2-0050: decoder processor is SAA7115 (idx 19)
tveeprom 2-0050: has no radio, has IR receiver, has no IR transmitter
ivtv0: Autodetected Hauppauge WinTV PVR-250
tuner 2-0061: chip found @ 0xc2 (ivtv i2c driver #0)
saa7115 2-0021: saa7115 found (1f7115d0e100000) @ 0x42 (ivtv i2c driver #0)
msp3400 2-0040: MSP4448G-A2 found @ 0x80 (ivtv i2c driver #0)
msp3400 2-0040: MSP4448G-A2 supports radio, mode is autodetect and
autoselect
tuner 2-0061: type set to 2 (Philips NTSC (FI1236,FM1236 and compatibles))
ivtv0: Registered device video0 for encoder MPEG (4 MB)
ivtv0: Registered device video32 for encoder YUV (2 MB)
ivtv0: Registered device vbi0 for encoder VBI (1 MB)
ivtv0: Registered device video24 for encoder PCM audio (1 MB)
ivtv0: Initialized Hauppauge WinTV PVR-250, card #0
ivtv: ==================== END INIT IVTV ====================

Thanks,
Richard

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srey0123+ivtv at gmail

Sep 6, 2007, 10:31 PM

Post #2 of 4 (732 views)
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Re: Corrupt NTSC captions with PVR-250 and ivtv > 0.10.1 [In reply to]

On Sep 6, 2007, at 9:06 PM, Richard Woelk wrote:

> [...] If I got back to IVTV version 0.10.0, then the captions work
> OK again,
> but then my lirc_serial homebrew remote receiver has major repeat
> issues
> while capturing.

I've mentioned this once or twice; I'm stuck at a 0.10 build (svn rev
3824 to be precise) because of this. The problem seems to have
something to do moving VBI processing out of the interrupt handler. I
keep hoping for a solution because we can't live without CC, and I
don't know enough about VBI to even begin to debug what's going on. :(

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dsegel at gmail

Sep 9, 2007, 5:12 PM

Post #3 of 4 (719 views)
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Re: Corrupt NTSC captions with PVR-250 and ivtv > 0.10.1 [In reply to]

On 9/6/07, Scott Reynolds <srey0123+ivtv [at] gmail> wrote:
> On Sep 6, 2007, at 9:06 PM, Richard Woelk wrote:
>
> > [...] If I got back to IVTV version 0.10.0, then the captions work
> > OK again,
> > but then my lirc_serial homebrew remote receiver has major repeat
> > issues
> > while capturing.
>
> I've mentioned this once or twice; I'm stuck at a 0.10 build (svn rev
> 3824 to be precise) because of this. The problem seems to have
> something to do moving VBI processing out of the interrupt handler. I
> keep hoping for a solution because we can't live without CC, and I
> don't know enough about VBI to even begin to debug what's going on. :(
>

I just wanted to weigh in on this too. I've been meaning to post
something about this for a while, but never seem to get around to it.
I'm running 0.9.1 on a Gentoo MythTV system because none of the later
versions work for me (I'm not sure if I've tried 0.10.0 itself, but
the 1.0.2 version currently in portage definitely doesn't work).

Daniel

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hverkuil at xs4all

Sep 16, 2007, 5:21 AM

Post #4 of 4 (684 views)
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Re: Corrupt NTSC captions with PVR-250 and ivtv > 0.10.1 [In reply to]

On Friday 07 September 2007 04:06:08 Richard Woelk wrote:
> Hello,
> I've been searching for a solution to this for a while. I've been
> using closed captions with Mythtv and my PVR250 since it started
> supporting that option. After I upgraded to ivtv version 0.10.1, I
> get extreme losses in the captioning, somtimes 5 to 10 letters are
> missing from the sentence. I've even updated to the latest Fedora
> kernel 2.6.22 and IVTV version 1.0.0 and it is still a problem.
>
> If I got back to IVTV version 0.10.0, then the captions work OK
> again, but then my lirc_serial homebrew remote receiver has major
> repeat issues while capturing.
>
> I don't think it is a Mythtv problem, because I can watch shows
> recorded with pre 0.10.1 and it plays it back OK. also, files
> recorded with cat /dev/video0 > test.mpg have the same problem when
> played in mythtv.

It's very difficult for me to test this, so in order to fix it I need
access to a box with a PVR250 or PVR350 installed, and with the latest
v4l-dvb repository installed as well.

If someone can give me access to a box then I can try to fix it.

Regards,

Hans

>
> here's my dmesg output.
>
> ivtv: ==================== START INIT IVTV ====================
> ivtv: version 1.0.0 (2.6.22.2-42.fc6 SMP mod_unload ) loading
> ivtv0: Autodetected Hauppauge card (cx23416 based)
> ivtv0: Unreasonably low latency timer, setting to 64 (was 32)
> ivtv0: loaded v4l-cx2341x-enc.fw firmware (-139636913516176 bytes)
> ivtv0: Encoder revision: 0x02060039
> tveeprom 2-0050: Hauppauge model 32032, rev B310, serial# 6983495
> tveeprom 2-0050: tuner model is Philips FI1236 MK2 (idx 10, type 2)
> tveeprom 2-0050: TV standards NTSC(M) (eeprom 0x08)
> tveeprom 2-0050: audio processor is MSP4448 (idx 27)
> tveeprom 2-0050: decoder processor is SAA7115 (idx 19)
> tveeprom 2-0050: has no radio, has IR receiver, has no IR transmitter
> ivtv0: Autodetected Hauppauge WinTV PVR-250
> tuner 2-0061: chip found @ 0xc2 (ivtv i2c driver #0)
> saa7115 2-0021: saa7115 found (1f7115d0e100000) @ 0x42 (ivtv i2c
> driver #0) msp3400 2-0040: MSP4448G-A2 found @ 0x80 (ivtv i2c driver
> #0) msp3400 2-0040: MSP4448G-A2 supports radio, mode is autodetect
> and autoselect
> tuner 2-0061: type set to 2 (Philips NTSC (FI1236,FM1236 and
> compatibles)) ivtv0: Registered device video0 for encoder MPEG (4 MB)
> ivtv0: Registered device video32 for encoder YUV (2 MB)
> ivtv0: Registered device vbi0 for encoder VBI (1 MB)
> ivtv0: Registered device video24 for encoder PCM audio (1 MB)
> ivtv0: Initialized Hauppauge WinTV PVR-250, card #0
> ivtv: ==================== END INIT IVTV ====================
>
>
>
> Thanks,
> Richard
>
> _______________________________________________
> ivtv-users mailing list
> ivtv-users [at] ivtvdriver
> http://ivtvdriver.org/mailman/listinfo/ivtv-users

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