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GeneralAntilles is offline GeneralAntilles
2008-06-03 , 16:14
Posts: 5,478 | Thanked: 5,222 times | Joined on Jan 2006 @ St. Petersburg, FL
#21
Originally Posted by vbrilon View Post
As Ace said, it definitely sounds like a keyframe issue. I am not sure what we can do about this if you're already using the "best" quality. On OS X we're relying on the underlying QT codecs to manage this kind of stuff, whereas on Windows we actually ship very high quality commercial codecs that seems to be better quality wise for certain types of videos.
QuickTime's mpeg4 encoding pretty much sucks, unfortunately. The biggest problem I've always had with QuickTime Pro exporting is keyframing, the defaults always give you the pulsing picture quality. You might try extending the keyframe interval a bit to see if that helps (as that made the pulsing go away for me, at least until I moved to mencoder ).
 
robbneu is offline robbneu
2008-06-03 , 16:27
Posts: 37 | Thanked: 7 times | Joined on Feb 2008 @ Denver, CO
#22
Originally Posted by vbrilon View Post
I think you definitely have a more sensitive eye for this than most people (and I mean that as a compliment).
Hehehe. Thanks! As I said, I have a sensitivity to flashing lights and such, so it stuck out for me.

Originally Posted by vbrilon View Post
Would it be possible for you to try the Windows version of ITVC and see if the results are better to your eyes? Also, can you reproduce this problem with all types of video sources (i.e., high quality and with different codecs)?
I've tried a number of different files, ranging from DVDs that I ripped using Handbrake and movie files I downloaded off the 'net, and I seem to get the same results (one "off" frame every second) regardless of the file type (mp4 vs mov). I haven't done much with AVI files, so that's worth checking.

I can probably give the Windows version a go on my office PC, but that might not happen for a while, as I'm away from my office a good chunk of time. Still, when I have a chance, I'll try it and report back.

Sorry about the thread-jacking! That wasn't my intent at all!
 
vbrilon is offline vbrilon
2008-06-03 , 16:56
Posts: 183 | Thanked: 77 times | Joined on Jul 2006 @ Mountain View, CA
#23
Originally Posted by GeneralAntilles View Post
QuickTime's mpeg4 encoding pretty much sucks, unfortunately.
Yeah that does suck and unfortunately I am not quite sure what we can do about it :/

You might try extending the keyframe interval a bit to see if that helps (as that made the pulsing go away for me, at least until I moved to mencoder ).
You *do* know that with a small amount of perl, java, or python, it's fairly trivial to write a plug-in for ITVC that will let it use an external encoder, right?
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GeneralAntilles's Avatar
GeneralAntilles is offline GeneralAntilles
2008-06-03 , 17:22
Posts: 5,478 | Thanked: 5,222 times | Joined on Jan 2006 @ St. Petersburg, FL
#24
Originally Posted by vbrilon View Post
You *do* know that with a small amount of perl, java, or python, it's fairly trivial to write a plug-in for ITVC that will let it use an external encoder, right?
No, not particularly, but Jaffa already wrote that code for me.

Talk somebody else into making the awesome mencoder plugin!
 
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Jaffa is offline Jaffa
2008-06-04 , 14:16
Posts: 2,535 | Thanked: 6,681 times | Joined on Mar 2008 @ UK
#25
Originally Posted by vbrilon View Post
You *do* know that with a small amount of perl, java, or python, it's fairly trivial to write a plug-in for ITVC that will let it use an external encoder, right?
I've got a prototype thingy around tablet-encode which acts as an encoder for ITVC - wasn't sure how valuable it really was, but might look at it again; especially if QT's mpeg4 encoding is crap.
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Last edited by Jaffa; 2008-06-05 at 08:34. Reason: Clarifying QT beration
 
GeneralAntilles's Avatar
GeneralAntilles is offline GeneralAntilles
2008-06-04 , 15:00
Posts: 5,478 | Thanked: 5,222 times | Joined on Jan 2006 @ St. Petersburg, FL
#26
Originally Posted by Jaffa View Post
especially if QT is crap.
Well, all of QuickTime isn't crap, just its mpeg4 encoder (for instance, h.264 encoding fine and it does fine at playback).
 
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Jaffa is offline Jaffa
2008-06-05 , 08:34
Posts: 2,535 | Thanked: 6,681 times | Joined on Mar 2008 @ UK
#27
Originally Posted by GeneralAntilles View Post
Well, all of QuickTime isn't crap, just its mpeg4 encoder (for instance, h.264 encoding fine and it does fine at playback).
Indeed, I was being lazy and slack with my language. Edited post to clarify :-)
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