<div>Thanks Mudit!</div>
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<div>You have given me something to play with this weekend!</div>
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<div>Perfect job for a slave backend..:)<br> </div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">------------------------------<br><br>Message: 6<br>Date: Thu, 1 Dec 2005 18:30:16 -0800<br>From: Mudit Wahal <
<a href="mailto:mwahal@gmail.com">mwahal@gmail.com</a>><br>Subject: Re: [mythtv-users] Re: More HD stuttering<br>To: Discussion about mythtv <<a href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a>><br>
Message-ID:<br> <<a href="mailto:be5fa62d0512011830h39036855p3c1c823eb621a37e@mail.gmail.com">be5fa62d0512011830h39036855p3c1c823eb621a37e@mail.gmail.com</a>><br>Content-Type: text/plain; charset=ISO-8859-1<br>
<br>Here is the mencoder script I use to transcode 1920x1080i mpeg2 to<br>1280x720p mpeg4. I use two passes and very high bit rate. I've 50"<br>Panny DLP connected to IOData LP2. When I play the original mpeg2 and<br>
transcoded mpeg4, I can't tell any difference. All movies and shows<br>actually look better in mpeg4. Its very cpu intensive. One hour of<br>recording takes about 8 hours on my sempron 3000+. I usually cut the<br>commercials using commercial_cut program. That cut down 1hr of program
<br>to 40-42 mins, and about 2 hrs of transcoding time.<br><br>##### no error checking is done #####<br><br>set oac="-oac copy" ## can substitute for mp3<br>set pp="pp=ci/hb/vb/dr/tn:1:2:3,"<br>set scale="1280:720:1" ## can change it to lower for non HD shows
<br>set profile="dxnhdtv" ## change it to dxnhtntsc for 720x480 resolution or lower<br>set cartoon=":" ## set it to :cartoon: if you transcode kids cartoon<br>shows or simpsons<br>set oac="-oac copy"
<br>set bitrate="9000" ## usually lower for non HD shows<br>set infile="$1" ## this is ur input file, 1st argument<br>set outfile="$2" ## this is ur output file, 2nd argument<br>set logfile="$infile".log
<br><br>####### 1st pass #######<br>mencoder $oac -noaspect -vf ${pp}scale=${scale} -ovc xvid -xvidencopts<br>turbo${cartoon}pass=1:profile=${profile}:bitrate=${bitrate}:max_bframes=1:<br>-o /dev/null -passlogfile $logfile $infile
<br><br>###### 2nd pass #########<br>mencoder $oac -noaspect -vf ${pp}scale=${scale} -ovc xvid -xvidencopts<br>pass=2${cartoon}profile=${profile}:bitrate=${bitrate}:max_bframes=1:<br>-o $outfile -passlogfile $logfile $infile
<br><br><br>######## for 1280x720p recordings I use the following #####<br>set ofps="-ofps 30000/1001"<br>mencoder $oac -noaspect -vf pp=hb/vb/dr/tn:1:2:3 -ovc xvid<br>-xvidencopts turbo:pass=1:profile=${profile}:bitrate=${bitrate}:max_bframes=1:
<br>-o /dev/null -passlogfile $logfile $infile $ofps<br>mencoder $oac -noaspect -vf pp=hb/vb/dr/tn:1:2:3 -ovc xvid<br>-xvidencopts pass=2:profile=${profile}:bitrate=${bitrate}:max_bframes=1:<br>$infile -o $outfile -passlogfile $logfile $infile $ofps
<br><br>Hope it helps.<br><br>Thanks<br><br>Mudit<br><br><br>On 12/1/05, Jason Sharpe <<a href="mailto:mythtv.list@gmail.com">mythtv.list@gmail.com</a>> wrote:<br>> I agree, very VERY frustrating.<br>><br>> I have built a couple of standalone front ends and both of them are
<br>> stuttering (one worse then the other). SD plays back pretty well, however HD<br>> is a different story. Sometimes I can get decent performance however most of<br>> the time I want to jump out of the window.
<br>><br>> Specs:<br>><br>> MSI 915G Mobo<br>> P4 3.0<br>> 1 Gig DDR400<br>> Nvidia 6600 GT PCIx<br>><br>> I am also seeing combing, however from the previous comment I agree that it<br>> is probly showing 1080i content on in 720p. My guess is that is probly
<br>> causing some other issues as well, not just combing, the front end has to<br>> scale down the picture to display it, I am sure that the processing power<br>> used to do that could improve playback.<br>><br>
> Since my theater and the plasma are only going to show 720p does anyone know<br>> of a good way to set it up so myth looks at every show after recording<br>> finishes and automatically transcodes shows in 1080i to 720p? (user job
<br>> perhaps?)<br>> I am new to myth (and Linux) so I haven't explored everything yet..:)<br>><br>> I am looking forward to solving the problems, I can't WAIT to ditch my Tivo.<br>><br>> Jason<br></blockquote>
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