1080p stuttering with external subtitles

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1080p stuttering with external subtitles

Postby psebos » Mon May 25, 2009 8:56 am

Hi,
I am another one who has converted from tversity recently using the amazing ps3 media server!!!!
I known that there have been a lot of discussions on the 1080p stuttering with external subtitles but after spending hours cannot figure out what is wrong.

The specs of the machine that the ps3mediaserver runs:
- Windows XP
- Intel Core 2 4300 @ 1.8GHz
- 2G RAM
- NVidia 8600 GT with 256 MB (supporting CUDA)
- Gigabyte P35-DS4-rev1 board
- 100Mbps wired connection to the PS3
- PSM version 1.10.5

I try streaming an 1080p H264 video and without subtitles everything works ok!
When trying to use subtitles everything goes wrong. The video is stuttering.
When looking at the task manager I see 97% use of the processor by the mencoder_mt
which I assume is the problem.

I tried then to lower the quality and the bandwidth used. I used the "lowest quality setting" and 10Mbps
as the bandwidth cap in the common encoder settings.

I see an obvious degration in the picture quality (in PS3) and a bandwidth (in the ps3) of 6-10Mbps which meant that it was working
but the exact same stuttering was there!!!!!

I am pretty sure that it is not the network (the PSM buffer is almost empty all the times)

When playing the video without any subtitles (the video does not need transcoding) it works perfectly!!!!

My understanding is that PSM is using some decoder to decode the video and then some encoder (mencoder all the times)
to encode back all the subtitles etc. It seems to me that the problem is not @ the decoder part but on the encoder one?
(I tried Avisynth as well with the CCCP codec pack as advised in the readme)

Any idea on how I can debug it more?

Thanks!!!!
psebos
 
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Joined: Mon May 25, 2009 8:34 am

Re: 1080p stuttering with external subtitles

Postby meskibob » Mon May 25, 2009 4:20 pm

Your 1.8GHz Core2 is not going to be enough for a full transcode to embed the subtitles (done with MEncoder by default), but it is enough to just do a remux (TSmuxer). If you want to use your CUDA support, you'll need to install CoreAVC (professional) in addition to AviSynth and FFDshow (from CCCP). Once that's setup you'll need to use the AviSynth/MEncoder option instead of MEncoder by itself. Take a look through the following thread for some more info, and even more threads are available if you search for CoreAVC: viewtopic.php?f=6&t=2195&p=9211&hilit=coreavc#p9211
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Re: 1080p stuttering with external subtitles

Postby pmos69 » Mon May 25, 2009 6:39 pm

You can quickly see if the problem is lack of cpu power if you pause the movie at the beginning for some seconds.
This should allow the buffer to gradually fill.
If you then start playback you should see the buffer decrease and the video start stuttering when it reaches 0.
pmos69
 
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Re: 1080p stuttering with external subtitles

Postby psebos » Tue May 26, 2009 1:24 pm

Thanks!

I tried pausing the movie the buffer was filling up and then started playing it back and it was fine!
Of course when there was a lot of action in the movie the buffer filled up and then the movie start stuttering again.

I was wondering whether I can go and overclock my proc. from the 1.8 to something more in order to accommodate the
1080p.
psebos
 
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Re: 1080p stuttering with external subtitles

Postby Subject2Change » Tue May 26, 2009 3:52 pm

If you have the money upgrade to an E8400 its a 3.0 Core2Duo. As if you don't have aftermarket cooling you will be pretty much destroying your CPU by overclocking it significantly. I'd also bump your RAM to 3GB if you are on a 32bit version of XP and up to 4gigs on a 64bit version of XP.
Core2Duo E8400 (@ 3.0), 8gigs of Mushkin, Vista Home Premium SP2 64bit, 2.5 TB of Space, Wired to Linksys WRT54G wired to 80GB MGS4 PS3 on Sharp 32" 720p LCD TV
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Re: 1080p stuttering with external subtitles

Postby psebos » Tue May 26, 2009 4:03 pm

Thanks!

Does it make sense for me to use 64 bit XP and get the 64 bit applications?
Will I see any speed improvements?

Thanks!
psebos
 
Posts: 21
Joined: Mon May 25, 2009 8:34 am

Re: 1080p stuttering with external subtitles

Postby Subject2Change » Tue May 26, 2009 10:25 pm

You may if you significantly increase your RAM to 4gigs from 2gigs but it probably isn't worth the effort, wait until Windows 7 is released and consider upgrading then. 32bit OSes are limited to 4gigs of RAM; that includes physical sticks as well as video card combined, so going to 3 gigs may be an option to maximize your system and help performance. And I really would suggest going to an E8400 at the very least; no problems at all with 720p material not even a hiccup. You can get an E8400 for about $170 USD.
Core2Duo E8400 (@ 3.0), 8gigs of Mushkin, Vista Home Premium SP2 64bit, 2.5 TB of Space, Wired to Linksys WRT54G wired to 80GB MGS4 PS3 on Sharp 32" 720p LCD TV
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