Re: Writing RTP payload to an MP-4 file

["Alessandro Angeli" <nobody@xxxxxxxxxxxxxxxxxx>]

From: "Treadstone"

> After I parse the RTP packets do I need to do any
> restructuring with the buffer I've received over RTP
> (i.e. creating Frames or some such thing), before I write
> it to a .mp4 file? Or is it sufficient if I just open a
> file with .mp4 extension and write all the incoming RTP
> Payload Data into it?

An MP4 file is not an "MPEG-4 file", since there is no such 
thing (well, it depends). If you write the raw data you will 
get a raw MPEG-4 video elementary stream, which may or not 
be understood by some applications (some applications can 
read an MPEG-4.10/AVC - aka H.264 - ES and probably also an 
MPEG-4.2/(A)SP one, at least as long as all the headers are 
there), but an elementary stream is not even close to an MP4 
file, which is a structured container that uses the ISO Base 
File Format syntax. If you want to create an MP4 file you 
need an MP4 muxer, either in a third-party filter, a 
third-party library or you can write your own based on the 
MPEG-4.12 specs.

http://www.chiariglione.org/mpeg/technologies/mp04-ff/index.htm


-- 
// Alessandro Angeli
// MVP :: DirectShow / MediaFoundation
// mvpnews at riseoftheants dot com
// http://www.riseoftheants.com/mmx/faq.htm