> Do you recommend a method for identifying frame start and end across multiple
> nals?
Does your encoder not tell you this 'out of band' somehow?
If not, then you can use the following algorithm to tell you if whether or not
a NAL unit begins a new 'access unit' (i.e., 'frame') - i.e., whether you need
to call "gettimeofday()" to set the presentation time for this (and perhaps
subsequent) NAL units:
Boolean doesH264NALUnitBeginNewAccessUnit(u_int8_t* nalUnit) {
u_int8_t nal_unit_type = nalUnit[0]&0x1F;
if ((nal_unit_type >= 6 && nal_unit_type <= 9) ||
(nal_unit_type >= 14 && nal_unit_type <= 18)) return True;
if (nal_unit_type <= 5 && nal_unit_type > 0) { // we're a VLC
NAL
// Look at the high bit of the next byte; if it's set,
then this NAL starts a new 'access unit':
if ((nalUnit[1]&0x80) != 0) return True;
}
return False;
}
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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