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Saad Khan
Saad Khan
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slow scrubbing along timeline. 30fps footage

May 3, 2012 9:29 PM

Hi. When I scrub along the timeline, it's very slow and jerky. I have a really powerful computer and frustrated as to why it would be this way. I have set playback and paused resolution to 1/4 and still it's slow.

 

I had a similar problem before that was solved by turning off maximum bit depth in the sequence setting. Now however, I'm having the same problem with different footage but I can't see what could be making it slow. The footage meta data and the Sequence settings are below. So is the computer hardware I'm using.

 

Windows 7 Ultimate

 

computer info.jpg

 

meta data.jpg

sequence settings.jpg

733 Views   10 Replies   Latest reply: joe bloe premiere, May 6, 2012 6:41 AM
 
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  • joe bloe premiere
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    1. joe bloe premiere,
    May 4, 2012 6:54 AM   in reply to Saad Khan
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    Are you using a RAID0 on a dedicated controller for your media drive?

     
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  • Saad Khan
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    2. Saad Khan,
    May 4, 2012 7:55 AM   in reply to joe bloe premiere
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    I'm using a raid0 hard drive. I'll have to finf out what you mean about a dedicated controller. Sorry. I didn't build the machine. Would that make a difference anyway?

     
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  • joe bloe premiere
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    3. joe bloe premiere,
    May 4, 2012 8:13 AM   in reply to Saad Khan
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    Would that make a difference anyway?

    Yes.

    A dedicated RAID controller has it's own processor and memory

    and will not steal system resources in order to manage the RAID.

     
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  • Jim Simon
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    4. Jim Simon,
    May 4, 2012 10:32 AM   in reply to Saad Khan
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    Would that make a difference anyway?

     

    With this media, probably not.  AVCHD is no more disk intensive than DV, and you can easily get DV to run multiple streams from a single drive.  It will be even less of a problem coming from a RAID 0.

     

    The issue with AVCHD is the processor.  But yours is much more than sufficient, even using software RAID.  (You can easilly test this just by opening Task Manager and seeing your CPU usage when playing footage.  Likely it is nowhere near maxed out.)  So...something else is interfering.

     

    (On a side note, a RAID 0 with tapelss media, for which you have no tape backup in the event of a drive failure, is not the best idea.  Ideally you want a RAID level that offers some form of data security.  RAID 3 is best, RAID 5 is OK, even RAID 1 is better than 0.)

     
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  • joe bloe premiere
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    5. joe bloe premiere,
    May 4, 2012 11:40 AM   in reply to Jim Simon
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    I agree that RAID0 is not the best place to keep the only copy of original source media.

    A drive failure is always possible.

     
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  • Saad Khan
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    6. Saad Khan,
    May 4, 2012 3:41 PM   in reply to Saad Khan
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    Hi. Thanks for the feedback. When you say something else is interfering, is there anything you can think of? I keep a back up of all my data and projects on an external hard drive. I think it's raid 5. It's supposedly the most secure one.

     
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  • Harm Millaard
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    7. Harm Millaard,
    May 5, 2012 9:32 AM   in reply to Jim Simon
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    Single track AVCHD playing and CPU usage is generally less than 35%:

     

    Transfer rate.png

    Transfer rates while playing is over 50 MB/s. This is on an old i7-920 CPU.

     
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  • Saad Khan
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    8. Saad Khan,
    May 6, 2012 5:15 AM   in reply to Harm Millaard
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    Hi Harm,

     

    so are you implying that there's something else wrong with my machine? That what's happening is abnormal?

     
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  • Saad Khan
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    9. Saad Khan,
    May 6, 2012 5:18 AM   in reply to Saad Khan
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    I found out from the IT guy who built my computer that the Raid0 Drive is run by windows 7 software and not from the bios. Is this a problem?

     

    By the way I hope I've interpreted the above message correctly. I'm pretty sure that's what he told me on the phone.

     
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  • joe bloe premiere
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    10. joe bloe premiere,
    May 6, 2012 6:41 AM   in reply to Saad Khan
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    the Raid0 Drive is run by windows 7 software and not from the bios. Is this a problem?

     

    An OS level RAID configuration will not deliver the same performance as

    a BIOS level RAID... whether controlled from the MB or a dedicated controller.

     

    Even a mid-range priced RAID controller will provide

    an appreciable disk read performance boost.

     

    Controllers / RAID Cards (NewEgg)

     
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