[Mp4-tech] MPEG4, MPEG2, and MPEG1

[Gary Sullivan]

+> Can I use MPEG2 decoder to decode MPEG1 streams or files?
In the case of video, the answer to this question is Yes.  The MPEG-2
video standard is a basically-straightforward extension of the MPEG-1
technology, and this kind of compatibility is required in the MPEG-2
video standard.
+> Can I use MPEG-4 decoder to decode 
+> MPEG1 or MPEG2
+> streams or files?
In the case of video, the answer to this question is ... Maybe.
To put it more precisely, the MPEG-4 standard does not require a product
to have this capablity.
However, MPEG-4 product makers may want their product to have that
capability and would put it in their product voluntarily.
Best Regards,
Gary Sullivan
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Kae Hsueh
+> Sent: Friday, January 21, 2024 10:09 AM
+> To: mp4-tech lists.mpegif.org
+> Subject: [Mp4-tech] MPEG4, MPEG2, and MPEG1
+> 
+> This might be a stupid question. Can some one tell me if MPEG2 is
+> backward compatible to MPEG1? It means can I use MPEG2 decoder to
+> decode MPEG1 streams or files?
+> 
+> Same go with MPEG-4. Can I use MPEG-4 decoder to decode 
+> MPEG1 or MPEG2
+> streams or files?
+> 
+> Kae
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