Thanks Mudit!
You have given me something to play with this weekend!
Perfect job for a slave backend..:)
------------------------------
Message: 6
Date: Thu, 1 Dec 2005 18:30:16 -0800
From: Mudit Wahal < [EMAIL PROTECTED]>
Subject: Re: [mythtv-users] Re: More HD stuttering
To: Discussion about mythtv <[email protected]>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1
Here is the mencoder script I use to transcode 1920x1080i mpeg2 to
1280x720p mpeg4. I use two passes and very high bit rate. I've 50"
Panny DLP connected to IOData LP2. When I play the original mpeg2 and
transcoded mpeg4, I can't tell any difference. All movies and shows
actually look better in mpeg4. Its very cpu intensive. One hour of
recording takes about 8 hours on my sempron 3000+. I usually cut the
commercials using commercial_cut program. That cut down 1hr of program
to 40-42 mins, and about 2 hrs of transcoding time.
##### no error checking is done #####
set oac="-oac copy" ## can substitute for mp3
set pp="pp=ci/hb/vb/dr/tn:1:2:3,"
set scale="1280:720:1" ## can change it to lower for non HD shows
set profile="" ## change it to dxnhtntsc for 720x480 resolution or lower
set cartoon=":" ## set it to :cartoon: if you transcode kids cartoon
shows or simpsons
set oac="-oac copy"
set bitrate="9000" ## usually lower for non HD shows
set infile="$1" ## this is ur input file, 1st argument
set outfile="$2" ## this is ur output file, 2nd argument
set logfile="$infile".log
####### 1st pass #######
mencoder $oac -noaspect -vf ${pp}scale=${scale} -ovc xvid -xvidencopts
turbo${cartoon}pass=1:profile="">-o /dev/null -passlogfile $logfile $infile
###### 2nd pass #########
mencoder $oac -noaspect -vf ${pp}scale=${scale} -ovc xvid -xvidencopts
pass=2${cartoon}profile="">-o $outfile -passlogfile $logfile $infile
######## for 1280x720p recordings I use the following #####
set ofps="-ofps 30000/1001"
mencoder $oac -noaspect -vf pp=hb/vb/dr/tn:1:2:3 -ovc xvid
-xvidencopts turbo:pass=1:profile=""
-o /dev/null -passlogfile $logfile $infile $ofps
mencoder $oac -noaspect -vf pp=hb/vb/dr/tn:1:2:3 -ovc xvid
-xvidencopts pass=2:profile="">$infile -o $outfile -passlogfile $logfile $infile $ofps
Hope it helps.
Thanks
Mudit
On 12/1/05, Jason Sharpe <[EMAIL PROTECTED]> wrote:
> I agree, very VERY frustrating.
>
> I have built a couple of standalone front ends and both of them are
> stuttering (one worse then the other). SD plays back pretty well, however HD
> is a different story. Sometimes I can get decent performance however most of
> the time I want to jump out of the window.
>
> Specs:
>
> MSI 915G Mobo
> P4 3.0
> 1 Gig DDR400
> Nvidia 6600 GT PCIx
>
> I am also seeing combing, however from the previous comment I agree that it
> is probly showing 1080i content on in 720p. My guess is that is probly
> causing some other issues as well, not just combing, the front end has to
> scale down the picture to display it, I am sure that the processing power
> used to do that could improve playback.
>
> Since my theater and the plasma are only going to show 720p does anyone know
> of a good way to set it up so myth looks at every show after recording
> finishes and automatically transcodes shows in 1080i to 720p? (user job
> perhaps?)
> I am new to myth (and Linux) so I haven't explored everything yet..:)
>
> I am looking forward to solving the problems, I can't WAIT to ditch my Tivo.
>
> Jason
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