I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
With kind regards,
René van Weert
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Posted: Thu Apr 05, 2007 10:35 am Post subject: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a pcmu
file, you can find it here:
----- Original Message -----
From: "René van Weert" <rvweert@gmail.com>
To: "'Development discussion of video media support in Asterisk'"
<asterisk-video@lists.digium.com>
Sent: Thursday, April 05, 2007 12:17 AM
Subject: [Asterisk-video] aac audio
Hi everyone,
I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
With kind regards,
René van Weert
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
René
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a pcmu
file, you can find it here:
----- Original Message -----
From: "René van Weert" <rvweert@gmail.com>
To: "'Development discussion of video media support in Asterisk'"
<asterisk-video@lists.digium.com>
Sent: Thursday, April 05, 2007 12:17 AM
Subject: [Asterisk-video] aac audio
Hi everyone,
I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
With kind regards,
René van Weert
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Yes, Francesco has been investigating that problem on audio (expecially on
Nokia handsets).
I think that the problem could be related with some small delay on app_play
that causes some
timing problems and makes the audio arrive late to the terminal.
As soon as I know something more I'll let you know, I don't have much free
time latelly
so mainly is just Francesco the one who is dealing with it.
By the way, i don't know if it would help, but the makefile was done without
optimization
(i think) so try recompiling everything with -O3 enabled to see if it help.
Greetings
Sergio Garcia
----- Original Message -----
From: "René van Weert" <rvweert@gmail.com>
To: "'Development discussion of video media support in Asterisk'"
<asterisk-video@lists.digium.com>
Sent: Wednesday, April 11, 2007 7:03 PM
Subject: RE: [Asterisk-video] aac audio
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
René
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a pcmu
file, you can find it here:
----- Original Message -----
From: "René van Weert" <rvweert@gmail.com>
To: "'Development discussion of video media support in Asterisk'"
<asterisk-video@lists.digium.com>
Sent: Thursday, April 05, 2007 12:17 AM
Subject: [Asterisk-video] aac audio
Hi everyone,
I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
With kind regards,
René van Weert
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Posted: Thu Apr 12, 2007 7:58 am Post subject: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a pcmu
file, you can find it here:
I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Thank you both for the advice. I tried now with audio at 12k and video at 50k. I also recompiled with -O3. On other phones the sound is better already but on my nokia n80 it still is a little blurry. Ff I turn of sending video and audio from the phone however the incoming audio quality improves quite a lot. Might this be something related to the problem?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a pcmu
file, you can find it here:
I'm using app_mp4 right now and it is working great. The only problem I have
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Thank you both for the advice. I tried now with audio at 12k and video at
50k. I also recompiled with -O3. On other phones the sound is better already
but on my nokia n80 it still is a little blurry. Ff I turn of sending video
and audio from the phone however the incoming audio quality improves quite a
lot. Might this be something related to the problem?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a
pcmu
I'm using app_mp4 right now and it is working great. The only problem I
have
Quote:
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Posted: Sun Apr 15, 2007 10:19 am Post subject: [Asterisk-video] aac audio
Hi,
I see indeed that the CPU load goes way down if I switch off sending audio/video on the mobile. Isn't there a way to disable the processing of this incoming audio/video on Asterisk?
Greetings,
RvW
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia Murillo
Verzonden: vrijdag 13 april 2007 1:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Probably, when turning off audio and video on nokia, less processing is
needed so you get less lagg.
I think it's time for optimization.. :)
Thank you both for the advice. I tried now with audio at 12k and video at
50k. I also recompiled with -O3. On other phones the sound is better already
but on my nokia n80 it still is a little blurry. Ff I turn of sending video
and audio from the phone however the incoming audio quality improves quite a
lot. Might this be something related to the problem?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
The destination file is available here:
http://www.digitalinteraction.nl/downloads/dest.mp4
Mp4info gives:
Track Type Info
1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
3 hint Payload H263-2000 for track 1
4 hint Payload AMR for track 2
The audio does sound correct when played back on a pc.
I also tried with lower bitrates for both audio and video but without
result.
Any clues in what I'm doing wrong?
Thanks in advance.
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
Murillo
Verzonden: donderdag 5 april 2007 12:48
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Hi
Why do you need to use AAC?
You should use one of the codecs supported by asterisk, currently you can
use pmcu or gsm-amr (for using it with app_h324m).
I added an application a few days ago for creating an mpr4 file from a
pcmu
I'm using app_mp4 right now and it is working great. The only problem I
have
Quote:
is that I cannot generate 8000hz AAC audio with my ffmpeg. I tried also
several different (precompiled) versions but without any luck. Ffmpeg only
accepts 11025hz or higher. Is there any other way to create the audio for
the mp4 file?
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Posted: Mon Apr 16, 2007 11:19 am Post subject: [Asterisk-video] aac audio
Hi Renè,
I' ve tried to switch off sending audio and video, but I experienced
only a very few improvement of quality. Quite far from that of other
handyset (e.g. Samsung).
More over, if mean problem were CPU load due to input video and audio,
probably we would experience same result on every handset and no only on
Nokia.
For sure optimization is a good choice but to solve definitely audio
problem my opinion is that we must investigate on other stuffes
I see indeed that the CPU load goes way down if I switch off sending audio/video on the mobile. Isn't there a way to disable the processing of this incoming audio/video on Asterisk?
Greetings,
RvW
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia Murillo
Verzonden: vrijdag 13 april 2007 1:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Probably, when turning off audio and video on nokia, less processing is
needed so you get less lagg.
I think it's time for optimization.. :)
Thank you both for the advice. I tried now with audio at 12k and video at
50k. I also recompiled with -O3. On other phones the sound is better already
but on my nokia n80 it still is a little blurry. Ff I turn of sending video
and audio from the phone however the incoming audio quality improves quite a
lot. Might this be something related to the problem?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
I could also be that you have better/faster hardware than I do. I am running on a P4 1.8Ghz with 512mb ram. This might be too low at the moment to process the incoming video and therefore cause in my case the audio to sound corrupted. On what system are you running?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: maandag 16 april 2007 11:06
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
I' ve tried to switch off sending audio and video, but I experienced
only a very few improvement of quality. Quite far from that of other
handyset (e.g. Samsung).
More over, if mean problem were CPU load due to input video and audio,
probably we would experience same result on every handset and no only on
Nokia.
For sure optimization is a good choice but to solve definitely audio
problem my opinion is that we must investigate on other stuffes
I see indeed that the CPU load goes way down if I switch off sending audio/video on the mobile. Isn't there a way to disable the processing of this incoming audio/video on Asterisk?
Greetings,
RvW
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com [mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia Murillo
Verzonden: vrijdag 13 april 2007 1:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: Re: [Asterisk-video] aac audio
Probably, when turning off audio and video on nokia, less processing is
needed so you get less lagg.
I think it's time for optimization.. :)
Thank you both for the advice. I tried now with audio at 12k and video at
50k. I also recompiled with -O3. On other phones the sound is better already
but on my nokia n80 it still is a little blurry. Ff I turn of sending video
and audio from the phone however the incoming audio quality improves quite a
lot. Might this be something related to the problem?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
I've just updated the svn with a new version.
I've implemented a simple jitter buffer for the audio channel. Now it won't
start muxing audio until it get a minimun size on the
buffer and then continue sending packets with a minimum delay between each
one.
I don't know if it's going or work or not, so any feedback would be very
valuable. You can change the values on the audio channel
constructor to see if we make it behave better.
H324MAudioChannel(3,160);
I could also be that you have better/faster hardware than I do. I am running
on a P4 1.8Ghz with 512mb ram. This might be too low at the moment to
process the incoming video and therefore cause in my case the audio to sound
corrupted. On what system are you running?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: maandag 16 april 2007 11:06
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
I' ve tried to switch off sending audio and video, but I experienced
only a very few improvement of quality. Quite far from that of other
handyset (e.g. Samsung).
More over, if mean problem were CPU load due to input video and audio,
probably we would experience same result on every handset and no only on
Nokia.
For sure optimization is a good choice but to solve definitely audio
problem my opinion is that we must investigate on other stuffes
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
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I could also be that you have better/faster hardware than I do. I am running
on a P4 1.8Ghz with 512mb ram. This might be too low at the moment to
process the incoming video and therefore cause in my case the audio to sound
corrupted. On what system are you running?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: maandag 16 april 2007 11:06
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
I' ve tried to switch off sending audio and video, but I experienced
only a very few improvement of quality. Quite far from that of other
handyset (e.g. Samsung).
More over, if mean problem were CPU load due to input video and audio,
probably we would experience same result on every handset and no only on
Nokia.
For sure optimization is a good choice but to solve definitely audio
problem my opinion is that we must investigate on other stuffes
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: donderdag 12 april 2007 9:59
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
Try to hint audio track indicating also payload size:
mp4creator --hint=2 -mtu=64 dest.mp4
I suggest you also to follow Sergio tip to compile with -O3 option. You
may also use amr mode 8, with ffmpeg option -ab 12K...lowering bit rate
doesn't give me any result, so I don' t think it is a good choice.
Quality should be much better. But still not good in Nokia N80 as in
other handset.
I'm working on it and let you know as soon as I have news.
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
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Posted: Wed Apr 18, 2007 9:06 am Post subject: [Asterisk-video] aac audio
Hi all,
Analyzing h223 flows, my suspect is that audio problem is the inverse of
what we can imagine. It is sent too slowly and not the inverse.
So, just to make a simple test I' ve modified function mp4_rtp_read to
return 18 (instead of correct value 20) when dealing with audio frame.
This speeds up audio output.
The result is definitely a good quality on Nokia. Just like Samsung.
A work around should be to hint mp4 file using -timescale option (and
probably some few more lines in app_mp4) just to speed up audio, and use
this trick together with new Sergio jitter buffer.
But optimum is to understand why audio sdu is sent slower than 1 each 20
ms as it should be (as app_mp4 reads a audio frame each 20 ms...)
Greetings
Francesco
On Tue, 2007-04-17 at 02:12 +0200, Sergio Garcia Murillo wrote:
Quote:
I've just updated the svn with a new version.
I've implemented a simple jitter buffer for the audio channel. Now it won't
start muxing audio until it get a minimun size on the
buffer and then continue sending packets with a minimum delay between each
one.
I don't know if it's going or work or not, so any feedback would be very
valuable. You can change the values on the audio channel
constructor to see if we make it behave better.
H324MAudioChannel(3,160);
I could also be that you have better/faster hardware than I do. I am running
on a P4 1.8Ghz with 512mb ram. This might be too low at the moment to
process the incoming video and therefore cause in my case the audio to sound
corrupted. On what system are you running?
-----Oorspronkelijk bericht-----
Van: asterisk-video-bounces@lists.digium.com
[mailto:asterisk-video-bounces@lists.digium.com] Namens francesco
Verzonden: maandag 16 april 2007 11:06
Aan: Development discussion of video media support in Asterisk
Onderwerp: RE: [Asterisk-video] aac audio
Hi Renè,
I' ve tried to switch off sending audio and video, but I experienced
only a very few improvement of quality. Quite far from that of other
handyset (e.g. Samsung).
More over, if mean problem were CPU load due to input video and audio,
probably we would experience same result on every handset and no only on
Nokia.
For sure optimization is a good choice but to solve definitely audio
problem my opinion is that we must investigate on other stuffes
Information in this email is confidential and may be privileged. It is
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please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
Francesco Emmi
A-Tono
Largo Paisiello, 5 - 95124 Catania
Tel.: (+39) 095.7365312
http: www.a-tono.com
Information in this email is confidential and may be privileged. It is
intended for the addresses only. If you have received it in error,
please notify the sender immediately and delete it from your system. You
should not otherwise copy it, retransmit it or use or disclose its
content to anyone.
Thank you for your co-operation.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
That it's exactly what I was thinking it was happening. I'll try to fix the
timing on app_mp4 and see if I can make it behave better.
Any way, the idea of the jitter buffer should increase the audio quality,
try increasing the number of packets in it to more than 3 (20 or
something like that to start) and if it works get it down till you've got an
aceptable delay with good sound. If it still don't work try setting the 160
parameter (minimun sent bytes between each audio frame) to a lower value.
Another good think to try could be recompiling the zaptel with a lower
read/write size i think it's in
channels/chan_zap.c:#define READ_SIZE 160
----- Original Message -----
From: "francesco" <francesco.emmi@a-tono.com>
To: "Development discussion of video media support in Asterisk"
<asterisk-video@lists.digium.com>
Sent: Wednesday, April 18, 2007 11:06 AM
Subject: Re: [Asterisk-video] aac audio
Quote:
Hi all,
Analyzing h223 flows, my suspect is that audio problem is the inverse of
what we can imagine. It is sent too slowly and not the inverse.
So, just to make a simple test I' ve modified function mp4_rtp_read to
return 18 (instead of correct value 20) when dealing with audio frame.
This speeds up audio output.
The result is definitely a good quality on Nokia. Just like Samsung.
A work around should be to hint mp4 file using -timescale option (and
probably some few more lines in app_mp4) just to speed up audio, and use
this trick together with new Sergio jitter buffer.
But optimum is to understand why audio sdu is sent slower than 1 each 20
ms as it should be (as app_mp4 reads a audio frame each 20 ms...)
Greetings
Francesco
On Tue, 2007-04-17 at 02:12 +0200, Sergio Garcia Murillo wrote:
> I've just updated the svn with a new version.
> I've implemented a simple jitter buffer for the audio channel. Now it
won't
Quote:
> start muxing audio until it get a minimun size on the
> buffer and then continue sending packets with a minimum delay between
each
> this incoming audio/video on Asterisk?
> >
> > Greetings,
> >
> > RvW
> >
> > -----Oorspronkelijk bericht-----
> > Van: asterisk-video-bounces@lists.digium.com
> [mailto:asterisk-video-bounces@lists.digium.com] Namens Sergio Garcia
> Murillo
> > Verzonden: vrijdag 13 april 2007 1:59
> > Aan: Development discussion of video media support in Asterisk
> > Onderwerp: Re: [Asterisk-video] aac audio
> >
> > Probably, when turning off audio and video on nokia, less processing
is
> > 50k. I also recompiled with -O3. On other phones the sound is better
> already
> > but on my nokia n80 it still is a little blurry. Ff I turn of sending
> video
> > and audio from the phone however the incoming audio quality improves
quite
> > but
> > > not 100% correct.
> > > I put up a sound sample of how it sounds on my Nokia N80 here:
> > > http://www.digitalinteraction.nl/downloads/audiosample.mp3
> > >
> > > Is it because there is still some work to do or because I am doing
> > something
> > > wrong the audio sounds so wrong?
> > >
> > > I have used ffmpeg to convert my media file as follows:
> > > ffmpeg -i woning2.wmv -ab 7.4k -ac 1 -acodec amr_nb -ar 8000 -vcodec
> > h263 -r
> > > 10 -s qcif -b 46K -pass 1 -passlogfile log dest.mp4
> > > ffmpeg -i woning2.wmv -ab 7.4k -ac 1 -acodec amr_nb -ar 8000 -vcodec
> > h263 -r
> > > 10 -s qcif -b 46K -pass 2 -passlogfile log dest.mp4
> > >
> > > mp4creator --hint=1 dest.mp4
> > > mp4creator --hint=2 dest.mp4
> > >
> > > The destination file is available here:
> > > http://www.digitalinteraction.nl/downloads/dest.mp4
> > > Mp4info gives:
> > > Track Type Info
> > > 1 video H.263, 77.500 secs, 44 kbps, 176x144 @ 10.000000 fps
> > > 2 audio AMR, 78.240 secs, 8 kbps, 8000 Hz
> > > 3 hint Payload H263-2000 for track 1
> > > 4 hint Payload AMR for track 2
> > >
> > > The audio does sound correct when played back on a pc.
> > > I also tried with lower bitrates for both audio and video but
without
> > > Murillo
> > > Verzonden: donderdag 5 april 2007 12:48
> > > Aan: Development discussion of video media support in Asterisk
> > > Onderwerp: Re: [Asterisk-video] aac audio
> > >
> > > Hi
> > >
> > > Why do you need to use AAC?
> > > You should use one of the codecs supported by asterisk, currently
you
Quote:
> can
> > > use pmcu or gsm-amr (for using it with app_h324m).
> > > I added an application a few days ago for creating an mpr4 file from
a
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