[Mp4-tech] Is SP@LL supported for MPEG-2 video?

Narendra Joshi narendra.joshi sasken.com
Thu Jul 19 17:09:21 EDT 2007


Annex E says that this clause it informative. 
Also, table E.21, they have specified upper limit on the sample density
(image size and fps), bit-rate, VBV buffer size. Does that mean any
thing below the allowed limits (i.e. MPEG-2 encoding for QCIF at 10 fps
using I & P frames only) is not an 'illegal' combination - so to say..?
Awaiting for reply,
thanks & regards,
Narendra 
-----Original Message-----
From: Gary Sullivan [mailto:garysull windows.microsoft.com] 
Sent: Thursday, July 19, 2023 12:51 PM
To: Narendra Joshi; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] Is SP LL supported for MPEG-2 video?
In a quick glance at the spec (not the latest version, but I don't
recall a change to that aspect and don't have the battery power to check
further), I only found Main level for the Simple profile of MPEG-2 video
(Annex E Table E.21).
Best Regards,
Gary Sullivan 
+> -----Original Message-----
+> From: mp4-tech-bounces lists.mpegif.org 
+> [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Narendra 
+> Joshi
+> Sent: Wednesday, July 18, 2023 4:45 AM
+> To: mp4-tech lists.mpegif.org
+> Subject: [Mp4-tech] Is SP LL supported for MPEG-2 video?
+> 
+> 
+> Hello,
+> 
+> Would like to know if SP LL (Simple Profile at low-level) supported 
+> in
+> MPEG-2 video standard or not...
+> 
+> When I searched on internet, there are docs that say only Main 
+> profile supports low-level, not simple profile.
+> Also there are docs indicating - SP LL is valid combination for 
+> MPEG-2 video.
+> 
+> My interest is, to get/create MPEG-2 compressed video streams for 
+> QCIF size data, compressed at 10-12-15 fps, with bit rates in the 
+> range 100 kbps to 400 kbps, with only I & P type frames (i.e. no B 
+> frames). Am not sure whether this is an allowed legal combination in 
+> MPEG-2 though....
+> And thus such streams would be prevalent in the market...
+> 
+> Would be helpful if someone replies with some concrete info..
+> 
+> thanks & regards,
+> Narendra
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