Mailing List Archive: MythTV: Users

Best way to get rid of interlace

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chicomakani at yahoo

Oct 31, 2006, 1:48 PM

Post #1 of 9 (1347 views)
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Best way to get rid of interlace

I'm running a PVR-150 at 720x480 interlaced mpeg2 encoding. Video
playback is either on a 19" TV (soon to be upgraded) or an seperate
computer with an LCD monitor.

When I upgrade my TV I'd like to capture and encode everything in
progressive format so that I never have to deal with interlacing issues.
Ideally, I'd like to perform the deinterlacing before the mpeg2 encoding.
Is there anyway to do this on the PVR-150? Alternatively, I could
capture interlaced video then transcode to progressive but I don't see how
to do this in the transcode profiles (the only options are for
interlaced dct or motion comp.) Has anyone built a system optimized for
progressive encoding and display? Thanks!

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freedenizen at gmail

Oct 31, 2006, 1:56 PM

Post #2 of 9 (1309 views)
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Re: Best way to get rid of interlace [In reply to]

On 10/31/06, Chico Makani <chicomakani [at] yahoo> wrote:
> I'm running a PVR-150 at 720x480 interlaced mpeg2 encoding. Video
> playback is either on a 19" TV (soon to be upgraded) or an seperate
> computer with an LCD monitor.
>
> When I upgrade my TV I'd like to capture and encode everything in
> progressive format so that I never have to deal with interlacing issues.
> Ideally, I'd like to perform the deinterlacing before the mpeg2 encoding.
> Is there anyway to do this on the PVR-150? Alternatively, I could
> capture interlaced video then transcode to progressive but I don't see how
> to do this in the transcode profiles (the only options are for
> interlaced dct or motion comp.) Has anyone built a system optimized for
> progressive encoding and display? Thanks!

You can't make it progressive before the pvr150 encodes it, and I
don't think there is a built in tool to make it progressive after the
fact either. Are you having a problem with the deinterlacers?
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timlitw at gmail

Oct 31, 2006, 2:00 PM

Post #3 of 9 (1310 views)
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Re: Best way to get rid of interlace [In reply to]

Related to this - I'm recording HD - but I can't view that over wireless.
what setting do I need to set to encode it down to something that still
looks ok on a 17" LCD but is small enough to view over wireless?

On 10/31/06, Asher <freedenizen [at] gmail> wrote:
>
> On 10/31/06, Chico Makani <chicomakani [at] yahoo> wrote:
> > I'm running a PVR-150 at 720x480 interlaced mpeg2 encoding. Video
> > playback is either on a 19" TV (soon to be upgraded) or an seperate
> > computer with an LCD monitor.
> >
> > When I upgrade my TV I'd like to capture and encode everything in
> > progressive format so that I never have to deal with interlacing issues.
> > Ideally, I'd like to perform the deinterlacing before the mpeg2
> encoding.
> > Is there anyway to do this on the PVR-150? Alternatively, I could
> > capture interlaced video then transcode to progressive but I don't see
> how
> > to do this in the transcode profiles (the only options are for
> > interlaced dct or motion comp.) Has anyone built a system optimized for
> > progressive encoding and display? Thanks!
>
> You can't make it progressive before the pvr150 encodes it, and I
> don't think there is a built in tool to make it progressive after the
> fact either. Are you having a problem with the deinterlacers?
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> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

myth at dermanouelian

Oct 31, 2006, 3:19 PM

Post #4 of 9 (1299 views)
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Re: Best way to get rid of interlace [In reply to]

On Oct 31, 2006, at 2:00 PM, Tim Litwiller wrote:

> Related to this - I'm recording HD - but I can't view that over
> wireless. what setting do I need to set to encode it down to
> something that still looks ok on a 17" LCD but is small enough to
> view over wireless?

Trial and error. "looks ok" means very different things to different
people. Also, "wireless" bandwidth means different things to
different people. I don't know of anyone who gets the full theoretic
802.11g 54 megabits. You'll have to try and get a balance that works
for the bandwidth you're getting and what you deem to be acceptable
quality.

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chicomakani at yahoo

Oct 31, 2006, 3:23 PM

Post #5 of 9 (1315 views)
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Re: Best way to get rid of interlace [In reply to]

> Are you having a problem with thedeinterlacers?
The interlacers work fine. The problem is that I
don't want to have to deal with interlaced content
when all my displays are progressive. When I move
files around I have to mess with them in order to get
them to display properly. (I use windows media player
on my PC which doesn't seem to have a deinterlacing
option.) Also, deinterlacing before encoding will be
more efficient for encoding and make better use of cpu
cycles since the job is done once, instead of every
time the video is played.

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timlitw at gmail

Oct 31, 2006, 9:13 PM

Post #6 of 9 (1309 views)
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Re: Best way to get rid of interlace [In reply to]

On 10/31/06, Brad DerManouelian <myth [at] dermanouelian> wrote:
>
> On Oct 31, 2006, at 2:00 PM, Tim Litwiller wrote:
> ...snipped...
>
> Trial and error. "looks ok" means very different things to different
> people. Also, "wireless" bandwidth means different things to
> different people. I don't know of anyone who gets the full theoretic
> 802.11g 54 megabits. You'll have to try and get a balance that works
> for the bandwidth you're getting and what you deem to be acceptable
> quality.
>
> Ok, but, where do I start?

myth at dermanouelian

Oct 31, 2006, 9:21 PM

Post #7 of 9 (1285 views)
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Re: Best way to get rid of interlace [In reply to]

On Oct 31, 2006, at 9:13 PM, Tim Litwiller wrote:

>
>
> On 10/31/06, Brad DerManouelian <myth [at] dermanouelian> wrote:
> On Oct 31, 2006, at 2:00 PM, Tim Litwiller wrote:
> ...snipped...
>
> Trial and error. "looks ok" means very different things to different
> people. Also, "wireless" bandwidth means different things to
> different people. I don't know of anyone who gets the full theoretic
> 802.11g 54 megabits. You'll have to try and get a balance that works
> for the bandwidth you're getting and what you deem to be acceptable
> quality.
>
> Ok, but, where do I start?

With the wiki, of course. :)

http://www.mythtv.org/wiki/index.php/
User_Manual:Daily_Use#Transcoding_Recordings

mythtv at salfter

Nov 2, 2006, 12:04 PM

Post #8 of 9 (1284 views)
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Re: Best way to get rid of interlace [In reply to]

Chico Makani wrote:
> When I upgrade my TV I'd like to capture and encode everything in
> progressive format so that I never have to deal with interlacing issues.
> Ideally, I'd like to perform the deinterlacing before the mpeg2 encoding.

You don't want to do that. It'll make inverse 3:2 pulldown impossible, so
anything you archive won't be in as good a format as it could be.

I tried out one of the Plextor USB tuner boxes a while back and took it back to
the store a few days later because it insisted on deinterlacing everything
before encoding.

I have a 30" LCD connected to my Mythbox. Kernel deinterlace works well and is
recommended.

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chicomakani at yahoo

Nov 5, 2006, 12:47 PM

Post #9 of 9 (1230 views)
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Re: Best way to get rid of interlace [In reply to]

> > When I upgrade my TV I'd like to capture and
> encode everything in
> > progressive format so that I never have to deal
> with interlacing issues.
> > Ideally, I'd like to perform the deinterlacing
> before the mpeg2 encoding.
>
> You don't want to do that. It'll make inverse 3:2
> pulldown impossible, so
> anything you archive won't be in as good a format as
> it could be.

I don't see a problem here. If the content has 3:2
pulldown then inverse telecine should be done along
with deinterlacing. Encoding/transcoding will be more
effective, and power will be conserved.

I think that transcode and ffmpeg can do 3:2 pulldown
removal and deinterlacing, but I don't see anything in
the mythtranscode documentation.

Will mythtranscode accept a command line arg to
perform 3:2 pulldown removal and deinterlacing?

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