[Mp4-tech] Reg diff bt 3gp&mp4

[Ryan Lei]

all based on box or atom structure.
major difference:
   3gp file can contain mp4/h263 video stream and mp4/amr audio stream, mp4
file only contain mp4 audio/video streams.
3gp decoder should be able to play back mp4 file, because most of the
decoder are only used for audio/video, the BIFS and
OD tracks are ignored. 
mp4 file can support animation, graphics, ect content. 3gp file only support
audio, video, text.
in mp4 file, one audio/video track can contain different audio/video stream,
in 3gp file, one audio/video track only contain
ione type of video/audio.
mp4 file can contain audio/video saved in anther file, linked by URL. 3gp
file is self contained.
and a lot fo some other minor difference.
For raw, mp4 video streams, I guess what you mean is .mp4 file contain mp3g4
video stream. You can find a lof of them from
QuickTime web site, or do a google also works. QuickTime Pro allows you to
transcode different audio/video file into mp4/3gp
  _____  
From: Pradeep kumar [mailto:vdeepu2 yahoo.co.in] 
Sent: Wednesday, July 21, 2023 10:44 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Reg diff bt 3gp&mp4
hi, what is the differences between 3gp and mp4 format? Can a 3gp decoder
will run mp4 files, what are the modifications to be done ?
2)where i can get the raw,mp4 video streams for testing ?
thanks in advance 
pradeep
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