[Mp4-tech] MP4 file parser

[MRUKANT POPAT]

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hi all,
I have some queries on MPEG-4 file parser.
I have read chapter 13 of 14496-1 which describes MPEG-4 file format. 
I also came across 14496-12 (ISO Base Media file format).
I have certain queries after reading both documents, which I hope you
guys can help me solve.
query1:- I have understood that ISO Base Media file format is superset
for all media file formats. Am I right? If not how does it differ from
other media file format?
query2:- If I implement parser for MPEG-4 files, does it have to look
for atoms mentioned in 14496-12 (ISO Base Media file format) or the
atoms mentioned in chapter 13 of 14496-1.
regards,
MRUKANT