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 Post subject: Re: how to fix?
PostPosted: Wed Apr 16, 2008 4:33 pm 
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neutron68 wrote:
Any thoughts about the xvid file being 2 times the size of the original HDTV mpeg2 file (which has a bitrate of about 14 mb/s, by the way)?
I expected an xvid file with a bitrate of 5 mb/s (script set for 5000) would be considerably smaller, but it wasn't.


I am not really sure about that. But I have never used a bitrate over 2500 myself.

I have updated both the myth2xvid and myth2xvid-noscale to fix the overwrite problem. I would suggest re-downloading.

Britney


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 Post subject: silly mistake
PostPosted: Wed Apr 16, 2008 6:27 pm 
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Location: Minneapolis, MN
Well, it was a silly typing error, dangit! :oops:
I missed a % sign and ended up with this in my command line:
/usr/local/bin/myth2xvid "%FILE%" "%TITLE% - SUBTITLE%" "%CHANID%" "%STARTTIME%"

I just looked at the xvid HDTV file (1920x1080) that was created overnight. It looks perfect with the bitrate set at 5000, but the downside is that the new file is 2x the size of the original. :lol:
Now I will reduce the bit rate to your 1900 and try this on another show tonight!

I grabbed your new no-scale script and chmod-ed it. I'm set.

Eric

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 Post subject: bitrate set to 1900
PostPosted: Thu Apr 17, 2008 8:40 am 
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I ran another record-transcode test with the newer no-scale script last night.

I set the bitrate to 1900 in the script. The original HDTV mpeg2 file is 14GB. The HDTV xvid file is 21GB and is named "The Truth About Cancer - .avi".

The myth2xvid log shows this:
Code:
Wed Apr 16 22:00:26 CDT 2008
File to encode: /myth/tv/1202_20080416200000.mpg     Name: The Truth About Cancer -
Encoding...
File Encoded Sucessfully: /myth/video/The Truth About Cancer - .avi
Encoding Time: 7 hour(s) 473 minute(s) 1 second(s)

It looks like the %SUBTITLE% %CHANID% and %STARTTIME% are getting ignored by the script?

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 Post subject:
PostPosted: Thu Apr 17, 2008 10:00 am 
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Posts: 1194
Location: SC
Think I figured out why the file is getting larger. I was playing with 2 pass encoding some time ago and had accidently left an option in the mencoder command that would basically ignore the bitrate setting. Sorry. I think I have fixed it now if you want to redownload it.

I am guessing that that particular show just doesn't have a subtitle. Look in MythWeb to confirm. The CHANID and STARTTIME are only needed if you are using the cutlist.

Britney


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 Post subject:
PostPosted: Thu Apr 17, 2008 7:33 pm 
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Location: SC
neutron68,

I killed myth2xvid-noscale and incorporated it into myth2xvid. To make it not scale just enter -1 for the RESOLUTION option in the script.

I also found some better encoding settings. Let me know how this works for you.

Thanks,
Britney


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 Post subject: will try
PostPosted: Thu Apr 17, 2008 9:37 pm 
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Location: Minneapolis, MN
Thanks very much for all the edits :!:

I've got a conversion running on tonight's My Name Is Earl using your 0.5 script. I can't get the job to stop so I'll have to let it go (the Stop Job button in Information Center's menu doesn't stop the job).

So, I'll have to try it Friday or Saturday and give feedback then.
Also, it's time for bed.

One of my goals is to have a script that will transcode to h.264. I think I could substitute some of the h.264 mencoder conversion lines I've seen into your script and have a working h.264 script. I was experimenting with this little script a year ago:
Code:
for file in $*
do
mencoder -ovc x264 -x264encopts bitrate=5000:pass=1 -vf lavcdeint -oac faac -o $file.x264.avi $file
mencoder -ovc x264 -x264encopts bitrate=5000:pass=2:8x8dct:i8x8 -vf lavcdeint -oac faac -o $file.x264.avi $file
done

What do you think?

Thanks again!

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 Post subject: output from script 0.5
PostPosted: Fri Apr 18, 2008 9:50 am 
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Location: Minneapolis, MN
Using the 0.5 (bitrate-fixed) script, I ran a transcode on last night's My Name Is Earl episode (30 minute, 1080i show, KARE-DT). I set the bitrate to 5000, which is 5MBit/sec. I believe.

Original mpeg file was 3.34 GB. Xvid version is 1.21 GB. :)
I don't know how the quality looks yet, so maybe the bitrate will need to go up a bit from 5000.
Code:
Thu Apr 17 21:42:45 CDT 2008
File to encode: /myth/tv/2101_20080417190000.mpg     Name: My Name Is Earl - No Heads and a Duffel Bag
Encoding...
File Encoded Sucessfully: /myth/video/My Name Is Earl - No Heads and a Duffel Bag.avi
Encoding Time: 1 hour(s) 52 minute(s) 9 second(s)

So, it looks like it takes about 2 hours to transcode a 30 minute 1080i program with the AMD Athlon 64 4200+ dual core processor.

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 Post subject: 5000 looks ok
PostPosted: Sat Apr 19, 2008 7:29 am 
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Friday night after work, I looked at the quality of the xvid transcode made at a rate of 5000. I use mplayer as my default Mythtv Videos player. It looked pretty good. Scenes with little motion in them looked perfect. Scenes with lots of motion got a little blocky. Audio sync was off for the first couple of seconds, but was synced ok after that.

I noted periods of jerkiness to the video. Have you ever seen that, brfransen? I wonder if this was due to un-corrected transmission errors in the original off-air recording? Or perhaps this is what happens when the xvid codec encounters interlaced video?

This has been a good learning experience. I now understand the how-to of installing a custom User Job! Thanks for that! 8)

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 Post subject:
PostPosted: Sat Apr 19, 2008 6:49 pm 
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Location: SC
Here is myth2x264.

Britney


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 Post subject:
PostPosted: Sun Apr 20, 2008 6:31 pm 
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Thanks Britney,

Both myth2xvid and x264 will be in the next release!


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 Post subject:
PostPosted: Sun Apr 20, 2008 6:36 pm 
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Posts: 405
Location: Bendigo, Victoria, Australia
Just a quick question. Can these userjobs be used to replace the builtin transcoding, so that transcoded recordings are still found in the Watch Recordings screen, so that they can still be easily found, watched, and deleted?

Thanks,
Paul T.

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 Post subject:
PostPosted: Thu Apr 24, 2008 11:27 am 
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Location: SC
turpie wrote:
Can these userjobs be used to replace the builtin transcoding, so that transcoded recordings are still found in the Watch Recordings screen, so that they can still be easily found, watched, and deleted?


The original recording remains in Watch Recordings and the transcoded recording will be in /myth/video by default. You could change the OUT_DIR= variable in the scripts to have the transcoded video placed in a different directory.

Britney


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 Post subject:
PostPosted: Thu Apr 24, 2008 11:38 am 
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I have updated myth2xvid and myth2x264 so that the progress will be shown (percent complete and fps) in the status screen and in MythWeb. Also, both scripts will monitor the Pause, Resume and Stop functions in the User Jobs Status screen and respond appropriately.

Britney


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 Post subject:
PostPosted: Thu Apr 24, 2008 11:47 am 
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I have been having some issues with the myt2xvid3 script failing, so I have just started using this myth2xvid script, thanks for providing it brfransen.

I'm just curious what the motivation for the script was and how it differs from the myt2xvid3 script. If you don't have time to explain it's no biggie.


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 Post subject:
PostPosted: Thu Apr 24, 2008 1:59 pm 
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Location: SC
knappster wrote:
I'm just curious what the motivation for the script was and how it differs from the myt2xvid3 script.


myt2xvid3 does alot more than I was looking for because it was adapted from myth2ipod; ie the RSS feed. myt2xvid3 uses nuvexport and I have found that for xvid mencoder is much quicker, I am not sure why. Also, I could never get myt2xvid3 to copy the ac-3 audio to the xvid so that dolby digital would be preserved. Since my myth box is digital only (I have no analog capture cards) I wanted the ac-3 and mencoder makes copying the audio very easy. Lastly, I am fairly new to shell scripting and thought this might be a good way to learn.

I am glad that it is working for you.

Britney


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