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H264 Sluggish Playback

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Benjamin Mullins
H264 Sluggish Playback
on Dec 5, 2011 at 4:48:26 pm

Hi,

I'm having a problem when playing H264 files back in Quicktime 7 on a PacPro (3GHz Quad, 5GB RAM). They look slightly sluggish and the audio appears very slightly out of sync. When played in VLC they look fine. They also play out of sync on the clients PC (what is the best codec for PC playback?). A typical file would be 1280x720, 25fps, 5000kbps, 250Mb, 48kHz audio. Source is P2.

Any suggestions would be most appreciated.

Thanks,

Ben.



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Dave LaRonde
Re: H264 Sluggish Playback
on Dec 5, 2011 at 5:05:09 pm

H.264 isn't an adequate editing codec for FCP. It takes a lot of processing power to play them back, which is what you're seeing. The files should be converted to ProRes 422, using either MPEG Streamclip, Compressor, or at Log & Transfer time in FCP.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Benjamin Mullins
Re: H264 Sluggish Playback
on Dec 6, 2011 at 8:22:18 am

Hi Dave,

Sorry if I was misleading, I'm not editing with H264 it's the playback in Quicktime that I have a problem with.

Ben.



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Joseph Hung
Re: H264 Sluggish Playback
on Dec 5, 2011 at 5:05:47 pm

Is it QT 7 Pro and up to date? maybe lower your kbps.

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Benjamin Mullins
Re: H264 Sluggish Playback
on Dec 6, 2011 at 8:24:05 am

Yes, Quicktime 7 Pro. I've tried encoding at the smallest bitrate I can without losing quality but it doesn't make any difference.



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Dave LaRonde
Re: H264 Sluggish Playback
on Dec 6, 2011 at 4:30:21 pm

Why don't you use Compressor to make the files?

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Joseph Hung
Re: H264 Sluggish Playback
on Dec 6, 2011 at 5:20:12 pm

Are you using the Quicktime H264 codec through Compressor? Are you outputting a self contained full resolution QT then bringing it into Compressor for the transcode? I personally avoid using the "Send To Compressor" setting.

http://www.tulpapictures.com
Twitter: @tulpapictures
Facebook: http://www.facebook.com/tulpapictures

Mac 2.66 GHz Quad Intel Xeon
OSX 10.6.8
FCS2
CS5
8GB RAM
ProAvio 8TB RAID 5 Dual Mini-SAS
Blackmagic Intensity Pro
ATI Radeon X1900
RocketRAID 4322 via dual MiniSAS
Panasonic Lumix GH2, Canon 5DMKII, 7D, Panasonic HVX200A, Panasonic DVX100A


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