H.264 export without audio creates files that are not recognized in Quicktime or VLC

Dear all,
I need to generate h.264 files with video only. (short clips for use with a "clickable" catalog on an iPad)
Used the "H.264" category and chose a preset. Unchecked "Audio" so I only get the video exported.
The resulting .m4v file is not playable in Quicktime or VLC or MPEG streamclip.
When I leave audio enabled with the same preset, the file is fine, but as soon as I export without audio, the resulting file is unreadable.
Source material is ProRes 422HQ, audio+video, about 30-40 seconds long.
Any clues?
Carl.
Mac Pro 5,1
24GB RAM
Nvidia Quadro4000
4TB internal RAID0
OS 10.7.5
Premiere 6.0.2

Thanks Jeff, I did get that far ;-)
I'm sorry, probably my question wasn't very clear. Of course I can find some technical info about the iPad...
And of course some of the presets in Media Encoder provide basic starting points for encoding.
But... there is also the first iPad, I couldn't find the specs about it on the Apple site. On everymac.com I found:
Apple reports that the iPad supports "H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats."
So if I want to be compatible with all iPads I need to probably stay under 720p30 with [email protected] for H.264
When I look at
http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC
I find (from the example values) that 1280x720@30p is quite near the maximum matrix size. So with 1024x576 I should be ok there. My bandwith of about 2Mbit is also well within range in this case. But what if I want to fill an iPod screen (1024x768) with the highest possible quality video? How do I calculate if this fits the max frame size requirements, where this is expressed in a number of luma samples and macroblocks? What is my max bandwith? The tables says that the "Max video bit rate for video coding layer (VCL) kbit/s" should be <14.000kbps. Does that directly translate to the sliders in my encoding app?
If you look in the table "AVC software implementations" (under Software encoder feature comparison) you can see that some features that are supported in MainConcept, and not supported in Qt. (8×8 vs. 4×4 transform adaptivity, Quantization scaling matrices, Separate Cb and Cr QP control, etc. What are these exactly?)
In Streamclip one can choose to have B-frames or not, in AME there is no such control. Does that mean it always encodes with B-frames? Why would one not want to have B-frames?
A lot of parameters in AME H.264 encoding seem to be set to certain fixed values that are not accessible to the user. Other programs (Sorensen, Telestream) provide the user with access to more parameters. Which parameters in AME are set to what (fixed, non-accessible) values and why?
As I said earlier, Quicktime reports different codecs for what should be the same format but from different encoders. Why? Is there a program that can analyze a H.264 stream and report about it in more detail than VLC/Quicktime?
etc. etc. etc....
If anyone could recommend an online resouce or a book to learn more about the ins and outs of H.264 encoding/decoding that would be great. I have the first edition of Charles Poynton's (brilliant!) book "Digital Video and HDTV", which does talk about MPEG-2 but not H.264. I saw that the second edition goes a bit more into detail about H.264. Does anyone have the second edition? Worth buying just for the relatively small addition about H.264?
Thanks.
Carl.

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