Good day to All!
I try to use PJSIP stack to encode and stream video in H.264 to another SIP
client through Asterisk server.
By default I can receive only 176x144 video at receiver's side.
I find out that in callback method
static void pjsua_call_on_media_update(pjsip_inv_session *inv, pj_status_t
status)
we have local and remote SDPs:
LOCAL SDP:
rtcp4019 IN IP4 192.168.2.57
sendrecv
rtpmap??97 H264/90000
fmtp97 profile-level-id=42e01e; packetization-mode=1
rtpmap??96 H263-1998/90000
fmtp96 CIF=1;QCIF=1
REMOTE SDP:
rtpmap??97 H264/90000
rtpmap??96 h263-1998/90000
sendrecv
so, I we can see - remote SDP don't say to us nothing about requested
resolution -> and in method
PJ_DEF(pj_status_t) pjmedia_vid_codec_h264_parse_fmtp(const
pjmedia_codec_fmtp *fmtp, pjmedia_vid_codec_h264_fmtp *h264_fmtp)
we always execute code
if (h264_fmtp->profile_idc == 0) {
h264_fmtp->profile_idc = 0x42;
h264_fmtp->profile_iop = 0x00;
h264_fmtp->level = 0x0A; // mean 10 level of H.264 encoder and
http://en.wikipedia.org/wiki/H.264 inform us about resolution = 176x144
}
then I cahnged h264_fmtp->level = 0x0A; to *h264_fmtp->level = 0x1E;*
and h264_fmtp->profile_iop
= 0x00; to *h264_fmtp->profile_iop = 0xE0;* (1E mean 30th level and
resolution 720x480) I successfully stream video with resolution 720x480.
BUT I dislike video quality.
*Question1*: How can I increase video quality? I already tried change bit
rate in structure static ffmpeg_codec_desc codec_desc[] from 256000/512000
to 512000/1024000. But this only makes video less stable(buttom part of
frames are always greased)
*Question2*: How can I change video resolution for outgoing stream with
respectively bit rate changes?
Question3: What does line mean
{"Constrained Baseline (level=30, pack=1)", 39}},
in *codec_desc* structure?
Thank you!
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