Thanks for this Ross.
AMD APU's DEM encoder does, but another TI Di-Vinci does not..
On a separate note, how different is the G-Streamer media server for RTSP
differ from Live555?
It looks similar at a glance.
Have a good weekend.
Rich.
From: live-devel [mailto:live-devel-boun...@ns.live555.com] On Behalf Of Ross
Finlayson
Sent: 20 January 2015 17:20
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] H264or5VideoStreamParser::parse() from a FramedSource
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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