MPEG Stutters Upon PC Playback

Hello,
I'm using Final Cut Pro to edit together 30-60 min shows that I then want to playback on a PC via an optibase video plex pro card triggered by a software program called Scala.
Since DVD's were my backup playback system, I got into the habit of exporting Quicktime movies of the finished shows (not self-contained) and importing them into Compressor. In Compressor, I then used the 90 min best 4x3 settings (6.2 variable bitrate) to create seperate m2v and aiff files. I then MUX them together using BitVice Helper. Once I had the MPEG, I loaded it onto the PC playback system and put them on the air.
Recently, I've noticed a playback problem. The videos play a few seconds, pause a beat, play a second, pause again, giving the audio and video playback a stuttering quality (however, at least the audio and video were in sync).
The only MPEGS giving me trouble are the ones I've compressed on my dual 2Ghz G5, either using Compressor and BitVice Helper or using Cleaner.
Can anyone dignose the problem? Other MPEGS on the system, encoded using a very expensive PCI card on a PC, seem to playback perfectly. However, I don't know if this is because of the encoding or because I didn't give them enought time to fail.
I'm trying to figure out if this is a corrupt file problem, encoding problem, video card problem, MAC to PC problem or a driver problem.
Any ideas? This is problem is plauging me and effecting the quality of the TV station I am running (single handedly, waaahh).
I'm based in the Bay Area and would entertain bids on an MPEG consultant.
Thanks
Editing System Info
Dual 2.7 Ghz PoerPc G5
2 GB RAM
OS 10.4.3
Final Cut Pro 5.0.4
Compressor 2.0.1
Sony DVCAM DSR-45
Playback System Info
Intel D915GAVL Motherboard
P4 3.2 LGA 775 Prescott w. 1mb cache CPU
2 GB (2 x 1GB) DDR400 Memory
eVGA Geforce MX6600 256MB PCIExpreess Graphics
Optibase VideoPlex Plus MPEG Decoder
Scala InfoChannel Player

Forgive me if I'm in over my head, but does this
matter for files you don't burn to DVD? There is no DVD burning involved.
Sorry, I was under the impression that you were burning to DVD-Rs. My response should be read in light of that assumption. So, please disregard my previous post if you are not burning to DVD-Rs.
"BitVice Helper" is available for free, but Innobits AB cannot give any support for it, because we have not written it. I have no reason to believe that it is faulty in any way, but it is a third party developer who has made it publically available on a "as is" basis. Maybe "MPEG Streamclip" can do a better multiplexing for your particular project. I simply don't know.
However, if you think that the problem stems from the MPEG-2 encoding rather that from the multiplexing, I'd suggest that you explore the trial version of BitVice.
http://www.innobits.se/ssl/download.php
PLEASE NOTE:
I may have an interest in your purchase of BitVice.
Roger Andersson / Innobits AB, makers of BitVice MPEG-2 encoder for the Mac

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MPEG-2 stutters upon PC Playback

Hello,
I'm using Final Cut Pro to edit together 30-60 min shows that I then want to playback on a PC via an optibase video plex pro card triggered by a software program called Scala.
Since DVD's were my backup playback system, I got into the habit of exporting Quicktime movies of the finished shows (not self-contained) and importing them into Compressor. In Compressor, I then used the 90 min best 4x3 settings (6.2 variable bitrate) to create seperate m2v and aiff files. I then MUX them together using BitVice Helper. Once I had the MPEG, I loaded it onto the PC playback system and put them on the air.
Recently, I've noticed a playback problem. The videos play a few seconds, pause a beat, play a second, pause again, giving the audio and video playback a stuttering quality (however, at least the audio and video were in sync).
The only MPEGS giving me trouble are the ones I've compressed on my dual 2Ghz G5, either using Compressor and BitVice Helper or using Cleaner.
Can anyone dignose the problem? Other MPEGS on the system, encoded using a very expensive PCI card on a PC, seem to playback perfectly. However, I don't know if this is because of the encoding or because I didn't give them enought time to fail.
I'm trying to figure out if this is a corrupt file problem, encoding problem, video card problem, MAC to PC problem or a driver problem.
Any ideas? This is problem is plauging me and effecting the quality of the TV station I am running (single handedly, waaahh).
I'm based in the Bay Area and would entertain bids on an MPEG consultant.
Thanks
Editing System Info
Dual 2.7 Ghz PoerPc G5
2 GB RAM
OS 10.4.3
Final Cut Pro 5.0.4
Compressor 2.0.1
Sony DVCAM DSR-45
Playback System Info
Intel D915GAVL Motherboard
P4 3.2 LGA 775 Prescott w. 1mb cache CPU
2 GB (2 x 1GB) DDR400 Memory
eVGA Geforce MX6600 256MB PCIExpreess Graphics
Optibase VideoPlex Plus MPEG Decoder
Scala InfoChannel Player

actually, i think you're right. i switched from compressor to a hardware encoder (WinTV). at the same time, i switched from vbr to cbr. i'm not sure if it was the switch from sowtware to a capture card or variable to constant, but it's working now. thank god.
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Hi, I wasn't sure exactly where to post this since I don't know if it's a DVD Studio Pro problem, a Compressor problem, or a FCP problem.
In a nutshell, the problem is this: our short film looks like it plays fine in our (color-calibrated) progressive-scan monitor. When we view it on a large LCD HDTV (a friend's newly-purchased Samsung), anything in motion looks stuttery (people, their shadows, any pans with the camera). Some things stutter worse than others, looks like it might have to do with areas of high contrast (people's shadows gliding across lit areas). We don't see these problems on our own CRT TV (a 15-year-old 20" SD tv).
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It's never been interlaced at any stage of the game, so I don't think that will be a problem.
Shot with: Canon XH-A1 in 24p mode, 1/24 shutter speed, 16:9.
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Final Cut Studio (version 1), latest updates (so FCP 5.1.4, etc.).
DVD Studio Pro settings - all defaults. Took compressor's .m2v and .ac files, added them to a track, burned a DVD (Verbatim DataLife) at 2x speed.
If it matters, we edit on either a MacBookPro (early 2008) or an iMac (2007) core2duo about 2.2GHz each, max memory (4GB and 3GB respectively).
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Just an edit to my post - I tried hooking up the matrox mxo to a CRT TV and it looked fine (well, no stuttering). The sequence apparently doesn't have stuttering in it to begin with. So it must have been the LCD HDTV we tested on.
Just got a chance tonight to test on another plasma hdtv (different model - panasonic) and there was a bit of stuttering there. So maybe the tv's sharpness is an issue? Both TVs that showed stuttering (a plasma and lcd hdtv) were set with very high sharpness values, and a CRT TV (pretty standard 20" model) and the samsung plasma HDTV (low sharpness setting) didn't show stuttering. So maybe we're at the mercy of sharpness settings, though I'm lost as to why that would cause this kind of effect.
Is that a probable cause of stuttery playback of motion shots - the sharpness setting of the TV?
kyle

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Cool. Hopefully someone will benifit from this .

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- Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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MPEG Stutters Upon PC Playback

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