Forums > Jitter

Skip free playback with firewire HD?

March 25, 2008 | 5:35 pm

After reading numerous threads on optimizing Quicktime, I’m still getting skips, which kind of ruins the mood for live performance. I’m wondering if any of you seasoned professionals think that referencing video from an external HD would smooth playback… I have a MBP.
Just wondering,
Mike


March 25, 2008 | 8:12 pm

so many questions.

what are you doing in your patch?
do you get the skips with my optimized patches?
does QT play the movie fine with ‘play all frames’ enabled off of your
HD?
what format is the QT movie in, bitrate/codec etc?

and so on and so forth.

On Mar 25, 2008, at 1:35 PM, burakoff wrote:

>
> After reading numerous threads on optimizing Quicktime, I’m still
> getting skips, which kind of ruins the mood for live performance.
> I’m wondering if any of you seasoned professionals think that
> referencing video from an external HD would smooth playback… I
> have a MBP.
> Just wondering,
> Mike


March 28, 2008 | 9:30 pm

Thanks for the reply Vade,
I am using a patch that syncs up video to Ableton Live. There is a lot of Gl processing, but as far as quicktime goes, It’s fairly simple, just a variable rate player. Everything is Motion Jpeg, best quality 30fps. After applying the techniques in your patches, the skipping is happening a lot less, still every 30 seconds or so, there will be a glitch. I guess I was just wondering if there was any advantage to loading video off of a separate HD than the operating system/Jitter.


March 28, 2008 | 10:16 pm

"I am using a patch that syncs up video to Ableton Live."
- ok, what does sync mean here?

"There is a lot of Gl processing,"
- realize that Jitter processing is not miltithreaded so if jitter has
to ‘wait’ for the QT movie, then this will ‘block’ openGL (as far as I
am aware, this is true). So if you have a stall ANYWHERE, be it
openGL, matrix processing or QT decoding, it will stall everywhere.

"Everything is Motion Jpeg, best quality"
- might be your issue. Best quality introduces a LOT of bandwidth over
head due to file size bloat while not being THAT MUCH nicer looking
that a lower quality./bitrate setting, like 70-80%. Try re-encoding at
70-80% as a last shot – and tell me if you can *really* see a visual
difference in your files.

"I guess I was just wondering if there was any advantage to loading
video off of a separate HD than the operating system/Jitter."
- yes there will be – you wont have to deal with competing resources
from the OS/host applications.

On Mar 28, 2008, at 5:30 PM, burakoff wrote:

>
> Thanks for the reply Vade,
> I am using a patch that syncs up video to Ableton Live. There is a
> lot of Gl processing, but as far as quicktime goes, It’s fairly
> simple, just a variable rate player. Everything is Motion Jpeg, best
> quality 30fps. After applying the techniques in your patches, the
> skipping is happening a lot less, still every 30 seconds or so,
> there will be a glitch. I guess I was just wondering if there was
> any advantage to loading video off of a separate HD than the
> operating system/Jitter.


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