Mailing List Archive: MythTV: Dev

question about changeset 11403

Index | Next | Previous | View Threaded

davilla at 4pi

Feb 3, 2008, 10:29 AM

Post #1 of 4 (361 views)
Permalink

question about changeset 11403

Changeset 11403 (Copies ATSC Caption descriptor from VCT to PMT in
DVBRecorder ) reference ticket 1095 (Improve EIA-708 caption decoding)

From the description,

"Terrestrial ATSC is not required to have a caption descriptor in the
PMT, this copies it over from the VCT when it isn't in the PMT. Since
we don't save the VCT in our DVB recordings we need these descriptors
in the PMT so we can inform the user of the language and other
properties of their caption streams."

Since the HDHomeRun can also capture terrestrial ATSC, should it also
have a similar patch. I can do a patch but I'm just asking if I'm
overlooking something.

Thanks
Scott
_______________________________________________
mythtv-dev mailing list
mythtv-dev[at]mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev

danielk at cuymedia

Feb 3, 2008, 10:46 AM

Post #2 of 4 (321 views)
Permalink

Re: question about changeset 11403 [In reply to]

On Sun, 2008-02-03 at 13:29 -0500, Scott D. Davilla wrote:
> Changeset 11403 (Copies ATSC Caption descriptor from VCT to PMT in
> DVBRecorder ) reference ticket 1095 (Improve EIA-708 caption decoding)
>
> From the description,
>
> "Terrestrial ATSC is not required to have a caption descriptor in the
> PMT, this copies it over from the VCT when it isn't in the PMT. Since
> we don't save the VCT in our DVB recordings we need these descriptors
> in the PMT so we can inform the user of the language and other
> properties of their caption streams."
>
> Since the HDHomeRun can also capture terrestrial ATSC, should it also
> have a similar patch. I can do a patch but I'm just asking if I'm
> overlooking something.

That code was moved to mpegstreamdata.cpp so I believe it is now used
for all DTV recorders for ATSC capture.

-- Daniel

_______________________________________________
mythtv-dev mailing list
mythtv-dev[at]mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev

davilla at 4pi

Feb 3, 2008, 11:05 AM

Post #3 of 4 (319 views)
Permalink

Re: question about changeset 11403 [In reply to]

> > Since the HDHomeRun can also capture terrestrial ATSC, should it also
>> have a similar patch. I can do a patch but I'm just asking if I'm
>> overlooking something.
>
>That code was moved to mpegstreamdata.cpp so I believe it is now used
>for all DTV recorders for ATSC capture.
>

ok thanks, scratch that then.

I've disabled DecodeDTVCC in libs/libmythtv/avformatdecoder.cpp and
so far that seems to reduce the frequency of my frontend hang/display
corruption so I'm looking around for why.

Running r15221, I can't go to the current svn yet, I don't want to
svn up my backend.

Just a comment, it seems that CC is always decode even if not
displayed. The CC decode is take about 5-10 percent of my 1GHz
pentium-m for ATSC from of-the-air . Is there any ramification with
not doing the CC decode unless actually displaying CC info?

_______________________________________________
mythtv-dev mailing list
mythtv-dev[at]mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev

mtdean at thirdcontact

Feb 3, 2008, 11:14 AM

Post #4 of 4 (324 views)
Permalink

Re: question about changeset 11403 [In reply to]

On 02/03/2008 02:05 PM, Scott D. Davilla wrote:
> Just a comment, it seems that CC is always decode even if not
> displayed. The CC decode is take about 5-10 percent of my 1GHz
> pentium-m for ATSC from of-the-air . Is there any ramification with
> not doing the CC decode unless actually displaying CC info?

I noticed a while ago that when I had -v vbi enabled and I paused
playback of a recording, the captions continued to decode (and were
printed to the log). I assumed it was just a bug related to the logging
(i.e. playback was paused, but somehow the logging "forgot" to pause
caption decoding), and looking into it is on my list, but it's not high
priority, so I haven't gotten around to it, yet.

I was thinking--though I don't remember for sure--that if I had not yet
enabled captions during playback, they were not decoded/logged (though,
even if that's the case, it may have changed since then).

Mike
_______________________________________________
mythtv-dev mailing list
mythtv-dev[at]mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev

Index | Next | Previous | View Threaded

Interested in having your list archived? Contact lists@gossamer-threads.com