Sanity Check - Very Slight Video Studdering - AVS Forum
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post #1 of 4 Old 12-03-2012, 07:20 AM - Thread Starter
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OK folks - I need a sanity check - here's my config -

MacBook Pro OS X 10.6.8 2.3 GHz Intel Core I5 4GB memory
VLC 2.0.4 (64bit version)
Thunderbolt-HDMI Cable
Vizio M3D055KDE TV
SPDIF out from TV - Optical Cable
Pioneer elite vsx-36tx A/V Receiver


My biggest issue - when I play .mkv files 1080P I get the slightest bit of choppyness or studdering on the video. I don't think I'm getting true 5.1 audio either - even thought the audio is supposed to be encoded with 5.1 - but my biggest issue is the video -
Is my MAC not powerful enough?
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post #2 of 4 Old 12-03-2012, 08:45 AM
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I had an entry level 2011 Mini (2.3 i5 w/ Intel HD 3000 Graphics) in the home theater for almost a year: it was plenty powerful enough to play full-size 1080p bluray rips back with XBMC and I never had any problems running HDMI directly to a 47" Vizio LED and optical to my AVR. That 2.3 i5 Mini was a very large leap forward for the price in terms of Mac home theater. I eventually swapped that Mini out for the mid-level 2011 Mini, the one with the Radeon HD 6630M graphics. Occasionally I came across a particularly challenging bluray that needed an acceleration boost from XBMC but most of the time I left that turned off in settings.

So, your Mac can do the job, but it's not plug and play foolproof because so many aspects of home theater require cooperation between devices and manufacturers and there are lots of settings and menus to learn and pay attention to and tweak. You're doing so many things that could be causing little glitches along the way, among them:

1) VLC. I think it sucks. Try playing the same files back with a better front end like Plex or XBMC. If an alternative player does a better job with your files then you know the problem was with VLC;
2) your 1080p .mkvs themselves--do all files or just certain specific files exhibit this behavior? There are lots of different "1080p .mkvs" out there. Be more precise. Are you making these files yourself or downloading the work of others, which could vary in quality? If ALL files are affected, those you rip plus those you pirate, that tells you it's more likely a setup and settings issue with your software player and hardware rather than the files per se, if only certain files are affected but others play perfectly well, you'd have to take a different approach;
3) could be an issue with your particular TB to HDMI adaptor and cable, consider swapping in something else to test with...likewise, are you going through your Pioneer first and then running an HDMI cable out to your TV or bypassing the AVR??? There can be issues related to either approach...and lots of settings you have to first, understand, and second, tweak.
4) there could be audio passthrough issues related to you going to the TV first and then optical out from the TV to the AVR...most here would go directly to the AVR when possible and not rely on such a circuitous route...no reason you couldn't go optical directly to your Pioneer to see if it makes any difference;
5) the location of your files can matter, i.e. whether there are network or streaming issues involved.

That's a lot to take in, but what all that really means is that it can take a lot of time to figure out the right menu settings for your devices--which are unique to you and different from my devices--which means allow yourself some time to experiment to find just the right settings for you with your software player, your AVR, and your TV. And don't short change your TV, HDTVs these days apply a lot of processing and oftentimes have confusing settings and menus. It took me quite a while to figure out what gave me the best performance with XBMC, and I had to tweak things in both the XBMC video menu settings and in the HDTV picture settings.
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I don't think I'm getting true 5.1 audio either - even though the audio is supposed to be encoded with 5.1

Again, it's best to rip and transcode your own files because then you know what the audio is supposed to be because you've checked off what you want within the various apps like MakeMKV, Handbrake, etc.

There have been a tons of "not getting true 5.1 and choppy/stuttering video" threads like yours over the years. Almost all of them come down to human error, i.e. not reading the manuals thoroughly, not having the right settings, not fully understanding the software, so sanity check-wise, with a little more patience and more specific tests, we probably could help you figure out what's really going on. It's not unusual things just didn't magically work right from the start for you. Home theater is a veritable minefield of sorts.
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post #3 of 4 Old 12-03-2012, 08:55 AM
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Oh, and can you describe the stuttering? Is it relatively constant, like every other frame seems out of whack to the point that you can see the image shift slightly? Does it only stutter in a particularly intense action scene or when the camera pans and otherwise everything seems perfectly smooth? Does it seem to happen at very regular intervals but unrelated to action or movement, i.e. regular like clockwork but spaced evenly apart?
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post #4 of 4 Old 12-03-2012, 10:28 AM - Thread Starter
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Thanks for the response....I am relatively new at this & I do realize there are a lot of moving targets here.
As far as my Video stuttering I'd say it is more like a freeze for about .1 of a second - & it happens on a consistent basis maybe every 30 seconds or so.
I've tried 2 different files and the same thing has happened.

The other thing to is if I play the file natively on the mac I do not see the studdering.

I like VLC because it plays anything you throw at it - but I'm going to start looking and experimenting with XBMC
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