QT Pro 1080p 29.97fps dropping frames

Hey everyone.
I can't quite figure out what it is I'm doing wrong here.
I'm taking an AVCHD MTS file recorded at 1080i/30fps and converting it to 1080p/30fps with Adobe Media Encoder CS4 using the H.264 codec at 16Mbps.
When I open the resulting MP4 file to edit in QT Pro, I can't get it to play more than 8fps, it's dropping frames like crazy.
I thought it might have been the encode, but if I upload the file to YouTube it plays just fine after processing (with the new option to choose 720p or 1080p).
Previously I just converted the MTS files to 720p to upload to YouTube but now that YT supports 1080p, I'd like to take advantage of that but the fact that the video is so jumpy and dropping frames (not just in QT Pro, same in VLC and Adobe Premiere CS4) makes editing almost impossible.
Anyone have any ideas how I can get QT Pro to playback 1080p content smoothly? Am I possibly doing something wrong during the encode (I don't think that's it since it plays smoothly once uploaded to YouTube)?
Also, I have 1080p trailers from Apple saved that run just fine (albeit at 24fps).
Thanks in advance.
P.S., having this problem on two Macs of mine, specs below:
MacBook Pro
10.5.8
2.4 Core 2 Duo
2 GB RAM
iMac
10.5.8
2.8 Core 2 Duo
2 GB RAM

Tom Torrillo wrote:
.. QT Pro, I can't get it to play more than 8fps,
.. but if I upload the file to YouTube it plays just fine .. 1080p.
.. the video is so jumpy and dropping frames (not just in QT Pro, same in VLC and Adobe Premiere CS4) ..
so, to summarize: as a stream, video is fine, not so played as 'local'?
my assumption would be a 'lack of speed' from your drives, the files are located on (=obviously, your Mac is able to playback such large files) .. any 'exotic' (=not internal HDD) set-up, ntfs-formatted network drive, TM using as mass-storage device, wireless connection in a 'crowded' surrounding etc?
and, if files are on internal drive: how much free disk space avail, any partitioning, 'drive consuming' apps running (FileVault, Spotlight indexing etc)?

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    Hey everyone.
    I can't quite figure out what it is I'm doing wrong here.
    I'm taking an AVCHD MTS file recorded at 1080i/30fps and converting it to 1080p/30fps with Adobe Media Encoder CS4 using the H.264 codec at 16Mbps.
    When I open the resulting MP4 file to edit in QT Pro or Premiere Pro CS4, I can't get it to play more than 8fps, it's dropping frames like crazy.
    I thought it might have been the encode, but if I upload the file to YouTube it plays just fine after processing (with the new option to choose 720p or 1080p).
    Previously I just converted the MTS files to 720p to upload to YouTube but now that YouTube supports 1080p, I'd like to take advantage of that but the fact that the video is so jumpy and dropping frames (not just in QT Pro, same in VLC and Adobe Premiere CS4) makes editing almost impossible.
    Anyone have any ideas how I can get smooth playback of 1080p content? Am I possibly doing something wrong during the encode (I don't think that's it since it plays smoothly once uploaded to YouTube)?
    Also, I have 1080p trailers from Apple saved that run just fine (albeit at 24fps).
    Thanks in advance.
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    the_wine_snob wrote:
    That's what I started to think but I have no problems playing 1080p trailers in QuickTime, VLC or Premiere (for testing purposes)
    This can easily give one a false sense of security. Playing a file is vastly different than editing that same file, even though the necessary CODEC's are installed. Players can handle the GOP structure easily. With an NLE, the GOP's are reconstructed so that everything is I-frame for the frame-by-frame editing. This is ton more work for the CPU. Depending on the actual structure, this can be 7x to 30x more work.
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    That's good to know but I'm having this frame rate problem playing files encoded with Adobe Media Encoder in stand-alone players as well.

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