Opened 11 years ago

Last modified 9 years ago

#1263 new defect

Max framerate for SP@L3 incorrect

Reported by: putte_xvi@… Owned by: reimar
Priority: normal Component: ve
Version: HEAD Severity: normal
Keywords: Cc:
Blocked By: Blocking:
Reproduced by developer: Analyzed by developer:

Description

There is a table in libmpcodecs/ve_xvid4.c which specifies constraints for encoding to the various profiles and levels of MPEG-4 part 2. For Simple Profile level 2 and 3 it specifies, in part:

level 2 level 3

max resolution: 352 x 288 352 x 288
max frames/s: 15 15
max macroblocks/s: 5940 11880

This does not look right for level 3. Since 352/16 * 288/16 * 15 = 5940, the figures are correct for level 2; but surely the limit for level 3 should be 30 fps?

More generally, The MPEG-4 standard doesn't, as far as I can tell, specify any particular maximum resolution or framerate, other than in terms of macroblocks/s (VCV decoder rate). So level 2 should allow e.g. 1056 x 96 @ 15 fps = 5940 macroblocks/s.

Description of the profiles: http://www.m4if.org/resources/profiles/index.html

Change History (1)

comment:1 Changed 9 years ago by compn

  • Owner changed from r_togni@… to reimar
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