[M4IF Technotes] Regarding MPEG4 video in 3GPP file format

[Franceschini Guido]

Be careful: 3GPP requires Simple Profile Level 0, which corrsponds to number 0x08
Guido Franceschini 
TILAB - Multimedia Division 
Via G.Reiss Romoli 274 
I-10148 Torino, Italy 
tel + 39 011 228 6137 
fax + 39 011 228 6299 
-----Original Message-----
From: Mody, Mihir [mailto:mihir   ti.com]
Sent: Friday, June 06, 2023 3:21 PM
To: 'technotes   lists.m4if.org'
Subject: [M4IF Technotes] Regarding MPEG4 video in 3GPP file format
Hi, 
I created 3GPP movie file using Apple's Quicktime 6.3 Pro. In  'DecodeSpecificInfo'  for MPEG4 video,  for 'profile_and_level_indication'  field it writes reserve word (0x08).  Ideally this field should 
be 0x01 indicating simple profile and level 1 for MPEG4 video. The file does not contain IODs.  How does decoder can find profile and level information in this case? Can it always assume
simple profile L1 stream? 
PS:  Also in case of Quicktime 6.0 Pro, it was writing 0xfe(reserve word) as 'profile_and_level_indication'  in MP4 files.
Regards, 
Mihir Mody 
Imaging and Audio Group, 
Texas Instruments Inc. 
Bangalore -India  
Email: mihir   ti.com 
Phone: +91-80-5099307 
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