Re: [OT] Help converting h.264 files.

On Thu, 12 Jan 2006 08:58:01 -0800, Paul Pietromonaco wrote:

> I should clear up some terminology here. What we call MP4 video is usually
> MP4 Level 1, Level 2 (or occasionally Level 3). H264 or AVC is internally
> known as MP4 Level 10. They all have the .MP4 extension - in this case MP4
> is a wrapper for the internal codecs - kinda like AVI. So, in a sense
> they're *all* MP4. But - generally - you refer to AVC encoded video
> separately from the older MP4 codecs.

MP4 containter format hasn't really taken off until AVC appeared though, so
if you see a file with MP4 extension, you can be fairly certain that it's
h.264.

> This is an important distinction to make because some of the 3rd party PSP
> video encoders don't have the AVC codecs. They're starting to show up, but
> it's not automatically guaranteed. The PSP refers to video as being either
> MP4 (i.e. level 1 or level 2) or AVC on the PSP's "browser". And,
> generally, the AVC video looks better than the MP4 video.

Since I don't own a PSP, I hadn't known of this. MP4 files available
on-line seem to almost always contain h.264 video.

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