IMovie won't recognize certain 'File extensions' ??

Hi,
can anyone help here. I use Handbrake to compress Movie files before I use Quicktime to 'export to web' option, then import to iMovie to then edit before submitting ti iTunes ( keeps the size down but still have good quality ). Anyway even though the files from Handbrake have either a .mov or .m4v extension iMovie won't recognize them, but if I then use QT export to web ( which in turn makes a folder with the new files inside ) which have the .m4v, iMovie will see it !!
Any ideas please.
The compressed file under Handbrake is small but good quality ( 2.3Gb down to 178Mb ) but if I use QT it then becomes even bigger ( 539Mb ) !!!!!
Steve

I'm new to Handbrake so could you tell me what do you mean by 'Don't include extraneous data tracks' ?
Most people use HandBrake to convert DVD content (usually multiplexed M2V video and AC3 audio) to iPhone, iPod, TV, iTunes/Front Row files for viewing and/or iMovie '08 compatible files for editing. Since DVD content usually contains chapter data and the default setting for Apple device presets like TV normally default to include the chapter track data and (in older versions) may default to include an extra AC3 "passthrough" audio track, the output from such conversions are not supported by iMovie '08. If this is true, then re-exporting the content as you described would remove the extraneous data and explain why the files are incompatible with iMovie '08 before export and compatible after.
However, you have not confirmed that the incoming files are, in fact, stored on DVDs or indicated which specific settings are being used for your HandBrake conversions. iMovie '08 is only "edit" compatible with files containing DV, AIC, Motion-JPEG, Photo-JPEG, and certain profiles of MPEG-4 or H,264 video compressed data. So there is always a secondary possibility here that you are selecting an incompatible form of output form HandBrake and then using the "Export for Web" option to accidentally convert the incompatible compression format to a compatible one since this option exports to H.264/AAC by default.
If you have a much better way of doing this I am all ears especially if it makes my life easier, I am on a steep learning curve here ( sending video podcasts to iTunes but in good quality ).
The normal approach would be to select the iPod preset within HandBrake (or within QT Pro, GarageBand, MPEG Streamclip, etc. if the source file is QT compatible) and convert directly to an iMovie '08 compatible file. The iPod preset would create a file equivalent to the "Desktop" (1500 Kbps) file created by the "Export for Web..." option but, as previously mentioned may contain a "chapter" track if you fail to turn it off. If you want a smaller output file, then all you have to do is reduce the target data rate in HandBrake. If you are currently editing the equivalent of the iPhone file (900 Kbps) using your current work flow, then reduce the target average bit rate to 900 or 1000 Kbps before exporting from HandBrake. Basically, this approach is faster since you do not have to export the data twice. On the other hand, it is a bit more complicated since you have to manually ensure any extraneous data tracks are de-selected and that the correct compressing preset/settings are selected.

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IMovie won't recognize certain 'File extensions' ??

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