Hi Jerry, I don't think ec_tail should be included in the calculation, honestly, not really sure how ec_tail works, just logically it buffers some playout frames for echo reference without necessarily delaying the playout (as much as ec_tail). Moreover, also not really sure whether rec_latency will really affect latency as much (any audio device expert could clarify this?). Some people did experience high end-to-end latency on WM, and this has been discussed before. BR, nanang On Tue, Jan 12, 2010 at 5:11 AM, Jerry Monteiro <jerrym at matrixconsultants.com.au> wrote: > ?hi Johan & Benny > > Thanks for the replies. > Ok if we use what Benny is suggesting the PLAY Latency=160; based on the > below settings I will have a minimum latency in the app of 540ms (being the > total of frame_ptime+ec_tail+rec latency+play latency). > Is my calculations correct? If my calculations are correct, I think the > latency will be very high once the sound gets to the remote party on an > actual call. Benny what do you recommend for the RECORD Latency value? > > media_cfg.clock_rate = 8000; > media_cfg.ptime = 20; //default codec ptime > media_cfg.audio_frame_ptime = 20; // > media_cfg.ec_tail_len = 200; // 0 > media_cfg.snd_rec_latency = 160; // original 100 > media_cfg.snd_play_latency = 160; // original 100 > media_cfg.ec_options = PJMEDIA_ECHO_SIMPLE; // default = 0 > > Best regards > jerry > ------------------------------ > > Message: 4 > Date: Mon, 11 Jan 2010 09:54:09 +0100 > From: Johan Lantz <johan.lantz@xxxxxxxxxxx> > To: pjsip at lists.pjsip.org > Subject: Re: Latency tweaks for Windows Mobile 6 (Jerry > ? ? ? ?Monteiro) > Message-ID: <4B4AE731.1010008 at genaker.net> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi Jerry > > I have only done measurments with ptime 80 and 100 and these are ok. > > One thing that caused me a lot of problems was that some of my phones was > not able to produce frames fast enough when > PJMEDIA_SND_DEFAULT_REC_LATENCY > ?was 100 i.e. the old setting. I think Benny changed this to a higher value > later on but I still have 200 on some old devices like HTC 3600 while more > powerful devices like Motorola Symbol can handle 100. > > I have never played with the > PJMEDIA_CODEC_MAX_SILENCE_PERIOD > > > /Johan > > Jerry wrote: > Hi all > > I am hoping someone could advise some of the optimal settings you have found > to work well for windows mobile 6 and above. > > Reading through the mailing lists, I have found some people that have used > the settings below, but would like if you could post the Values you have > used and perhaps other settings apart from the ones below. > > > > #define PJMEDIA_SND_DEFAULT_REC_LATENCY ?= ? > > #define PJMEDIA_SND_DEFAULT_PLAY_LATENCY = ? > > PJMEDIA_CODEC_MAX_SILENCE_PERIOD = ? > > frame ptime = ? > > ------------------------------ > > > Message: 8 > Date: Mon, 11 Jan 2010 16:22:29 +0000 > From: Benny Prijono <bennylp@xxxxxxxxx> > To: pjsip list <pjsip at lists.pjsip.org> > Subject: Re: Latency tweaks for Windows Mobile 6 (Jerry > ? ? ? ?Monteiro) > Message-ID: > ? ? ? ?<49a4be81001110822t6bd263e4se372863b01f7ec15 at mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Thanks for the info, Johan. > > Actually I changed PJMEDIA_SND_DEFAULT_PLAY_LATENCY (i.e. not REC) > from 100ms to 160ms for WM and to 140 on Win32, on release 1.5 (see > ticket #983). > > Cheers > ?Benny > > On Mon, Jan 11, 2010 at 8:54 AM, Johan Lantz <johan.lantz at genaker.net> > wrote: >> Hi Jerry >> >> I have only done measurments with ptime 80 and 100 and these are ok. >> >> One thing that caused me a lot of problems was that some of my phones was >> not able to produce frames fast enough when > PJMEDIA_SND_DEFAULT_REC_LATENCY >> was 100 i.e. the old setting. I think Benny changed this to a higher value >> later on but I still have 200 on some old devices like HTC 3600 while more >> powerful devices like Motorola Symbol can handle 100. >> >> I have never played with the PJMEDIA_CODEC_MAX_SILENCE_PERIOD >> >> >> /Johan >> > > > > ------------------------------ > > _______________________________________________ > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > > End of pjsip Digest, Vol 29, Issue 14 > ************************************* > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >
