Mp4 or m4v ?

Hi,
I have a projet, for example, 24 minutes long,
If shared to iTunes, checking HD 720P, it becomes a M4V file, 1.28 Gb big.
If shared to "file", also checking HD 720P, it becomes a MP4 file, 2.24 Gb big !
What is the difference? Why the size is almost double ? Is the audio or video quality different ?
I'm using iMovie 10.0.2.
The original media comes from Sony Handycam HDR-CX210, some photos from iPhoto, no music added.
The final movie will be watched on a Phillips HD television through Apple TV 2.
Thank you for answer !
Lezard 10

Either should be OK purely within iTunes; but if you want your podcast to be playable on Apple TV, iPhone or iPod Touch (and presumably iPad), you should read this Tech Note:
http://www.apple.com/itunes/podcasts/specs.html#formattingvideo

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Message was edited by: Eli Barb

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I posted this question under another topic, but I think it's more appropriate to stand alone:
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I've been trying to figure this out for days. I think I have a solution.
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I do not understand.

You want to convert your DVD video to Quicktime first, and then encode your video with compressor. Compressor gives you the most options for converting the video. Apple's compressor gives you lots of options for setting the size and quality of the H.264 file you want to create. Since it's Apple, the H.264 you create will work in Quicktime. Compressor is also really cheap at $50 on the Apple store.
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J
www.kitesites.com

An MP4 file is a container, like an AVI or MOV. What you choose to put in that container can be varied.
MP4 is kind of the official extension. Other extensions are used to kind of differentiate common usage.
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Because of this there can often be compatibility problems.
MPEG-4 Simple Profile encoded video is pretty compatible across platforms and players. H.264 encoded video would require a more up to date Quicktime player or other such player that can understand the h.264 codec. There are also derivatives like Divx and 3ivx which are not supported by Quicktime and also require a user to have the proper codecs installed in order to play the file.
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http://www.apple.com/itunes/store/podcaststechspecs.html#_Toc526939999a
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* H.264 video, up to 1.5 Mbps, 640 x 480, 30 frames per sec., Low-Complexity version of the Baseline Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
* H.264 video, up to 768 kbps, 320 x 240, 30 frames per sec., Baseline Profile up to Level 1.3 with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
* MPEG-4 video, up to 2.5 Mbps, 640 x 480, 30 frames per sec., Simple Profile with AAC-LC audio up to 160 kbps, 48 Khz, stereo audio in .m4v, .mp4, and .mov file formats
The iPod is your lowest common denominator for iTunes.
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Keep in mind that iTunes is not the only name in town. There are also Windows Media based portable players and a whole host of podcast "podcatcher" applications and podcast directory services that exist. You could conceivable create an iTunes feed for the Mac folks and others that would prefer iTunes. And also create a separate WMV feed that would be in RSS 2.0 format using WMV files for enclosures. This would then be submitted to other podcast directories or users can subscribe with their podcatchers directly from your webpage.
Erik

Mp4 or m4v ?

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