Catalyst jittery

[Paul Breen]

Hi all, about to send system out on tour and I'm just testing the content but it's playing very jittery. Freezing and playing. The content is a range of videos with sound 720p coming from SSD. PLay's just fine on quicktime but quite bad through catalyst. Not sure what to do. see below for system specs

[Paul Breen]

Ok I've narrowed it down to the audio. When it's playing normally its fine. But when I enable the sound for the video it just dies in speed and cannot play properly at all. I haven't used audio on the system so far, so hence why I only noticed it now. Please help! As i said on the mac normally it plays fine, just not in catalyst

[dmxdesign]

I had the same issue with audio playback and resolved it by using QuickTime 7 pro and exporting using apple intermediate codec AIC this solved my issues.The reason I was told why it was playing up is that in normal use with no audio video takes priority but with audio audio takes priority and video frames would be dropped
Hope this is of some use
Chris

[Marty Postma]

Yeah.....sounds like a codec issue.
What codec is your original file in?

[Mr_P]

Paul

Check your codecs and data rates...

Catalyst prioritises audio so that you get no audio glitches when using audio playmodes. However, this may cause video 'glitching' if your content is not rendered in a sensible codec.

How many files are you trying to play?
what graphics card are you using?

dont use TH2G if you have a GT120 - it isnt good enough. - see other posts on the forum.

Do call if you need more help

Simon

[Paul Breen]

its h264 720P, 9 videos, average length 5 mins

Im not using th2g, 2nd output is going straight on rgb looms to barco g10

Im actually taking dmxdesign's advice on AIC right now, thanks! Let's hope it works

Just doing these at home so when I get to the cat tomorrow ill try them out, why does AIC work differently? Thanks guys 'n gals

[technick]

Paul

Hope all is good with you.

Suspect you need to convert your files to AIC codec...

You can do this in Catalyst.

Call me if you need to.

Nick Malbon

[Paul Breen]

Hey nick!

Yep in the middle of it now, changing the audio format to stereo at a higher sampling rate, the 16khz isn't enough I feel

How's life nick? Haven't seen you since that last time in dice bar

[samsc]

Hey nick!

Yep in the middle of it now, changing the audio format to stereo at a higher sampling rate, the 16khz isn't enough I feel

How's life nick? Haven't seen you since that last time in dice bar


---

audio is usually 44.1kHz or 48kHz

16kHz means someone messed up.

and this is probably a h264 file.

-

but also with audio you need to be super conservative on system spec- as the frame rates of movie dont exactly match the video frame rates.

i have a show at ENO this week - very high profile video/audio - mike figgis - and we run 1 layer of video with audio with 60Hz output -
so we use catalyst playback set to 60fps - not 25 or 30fps-
because this produces the lowest possible frame misses when playing audio - its also prores HQ 1080.

[Paul Breen]

Thanks for all your answers, helped a lot.
So i exported quicktime AIC with mono linear pcm at 44.1khz. Tried it stereo but was sort of happening too. Setting up at 10am for run through at 2 so as soon as i get through the rehearsal ill post updates.

Cheers