Latency tweaks for Windows Mobile 6
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@genaker.net
To: pjsip@lists.pjsip.org
Subject: Re: [pjsip] Latency tweaks for Windows Mobile 6 (Jerry
Monteiro)
Message-ID: 4B4AE731.1010008@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@teluu.com
To: pjsip list pjsip@lists.pjsip.org
Subject: Re: [pjsip] Latency tweaks for Windows Mobile 6 (Jerry
Monteiro)
Message-ID:
49a4be81001110822t6bd263e4se372863b01f7ec15@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@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@lists.pjsip.org
http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org
End of pjsip Digest, Vol 29, Issue 14
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@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@genaker.net
To: pjsip@lists.pjsip.org
Subject: Re: [pjsip] Latency tweaks for Windows Mobile 6 (Jerry
Monteiro)
Message-ID: 4B4AE731.1010008@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@teluu.com
To: pjsip list pjsip@lists.pjsip.org
Subject: Re: [pjsip] Latency tweaks for Windows Mobile 6 (Jerry
Monteiro)
Message-ID:
49a4be81001110822t6bd263e4se372863b01f7ec15@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@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@lists.pjsip.org
http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org
End of pjsip Digest, Vol 29, Issue 14
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