[FFmpeg-user] Setting the "profile compatibility" value
Carl Eugen Hoyos
cehoyos at ag.or.at
Wed Oct 28 07:50:56 CET 2015
Jim Kang <jim_kang <at> harvard.edu> writes:
> The problem is I need my video to be encoded such that
> it conforms to the MIME codec string
> 'video/mp4; codecs="avc1.*42E01E*, mp4a.40.2"'.
Could you explain why?
If a server requires this, it seems broken to me but
maybe I am missing something?
> But unsurprisingly since I did nothing to set it, the
> profile compatibility is not what I want:
> I want that *c0* to be an *e0*. How can I set that?
This has nothing to do with FFmpeg (it sets the field
in the mov header to the same value as in the h264
stream) but x264 does not support setting it:
sps->b_constraint_set0 = sps->i_profile_idc == PROFILE_BASELINE;
/* x264 doesn't support the features that are in Baseline and not in Main,
* namely arbitrary_slice_order and slice_groups. */
sps->b_constraint_set1 = sps->i_profile_idc <= PROFILE_MAIN;
/* Never set constraint_set2, it is not necessary and not used in real world. */
sps->b_constraint_set2 = 0;
> ffmpeg version 2.7.1
While it makes no difference in your case, the
idea is of course to test current FFmpeg git
head before reporting an issue here.
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