Re: [asterisk-users] Call recording format
What format are the actual calls in? Are they in G.711u/a format or are they in something else (perhaps gsm?) format? I'm asking to find out if Asterisk would need to transcode them. On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. What could be the reason for this? Is Asterisk updating wav headers every time it writes? What would be recommended hardware setup for over 60 simultaneous call records? Regards, Vilius. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
Hi Joel, We have a meetme on which we are landing two G.711 alaw calls, one coming from TDM another from SIP. Once we those parties are in the conference we are adding one more leg using Local channel and starting to record it. Surely it would be logical if it would be less overhead recording alaw wav since we are using alaw on both parties, but its not. Thanks, Vilius. On 22 November 2010 14:19, Joel Maslak jmas...@antelope.net wrote: What format are the actual calls in? Are they in G.711u/a format or are they in something else (perhaps gsm?) format? I'm asking to find out if Asterisk would need to transcode them. On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. What could be the reason for this? Is Asterisk updating wav headers every time it writes? What would be recommended hardware setup for over 60 simultaneous call records? Regards, Vilius. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Vilius Adamkavicius InVADE Technical Support 3 Berkeley Crescent, Bristol United Kingdom BS8 1HA Company Registration Number: 3660482 Registered in England and Wales this email, and any attachment, is intended only for the attention of the addressee. Its unauthorised use, disclosure, storage or copying is not permitted. If you are not the intended recipient, please destroy all copies and inform the sender by return email. If you have received this email in error, please return it to the sender and highlight the error. We accept no legal liability for the content of the message. Any opinions or views presented are solely the responsibility of the author and do not necessarily represent those of InVADE. We cannot guarantee that this message has not been modified in transit, and this message should not be viewed as contractually binding. Although we have taken reasonable steps to ensure that this email and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. international phone number +44(0) 117 33 555 00 -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
On Mon, Nov 22, 2010 at 8:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. Ignoring your real questions, and asking an alternate question: Why not just record in gsm? If your answer is that you have to play these back on Windows, you can build an on-the-fly gsm-to-wav converter using sox. My understanding is that recording in wav doesn't exactly make you have higher audio quality in your recordings, although the experts at codecs could better answer that. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
Hi David, Looking at MOS G.711alaw wav most definitely has the higher score than gsm. Moreover recording in gsm is more CPU intense than wav. Therefore your suggestion to do more CPU intense recording and afterwards use system resources to convert it back to wav is not a solution. Also some of our customers require call recordings to be done in wav. Thanks, Vilius. On 22 November 2010 15:03, David Backeberg dbackeb...@gmail.com wrote: On Mon, Nov 22, 2010 at 8:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. Ignoring your real questions, and asking an alternate question: Why not just record in gsm? If your answer is that you have to play these back on Windows, you can build an on-the-fly gsm-to-wav converter using sox. My understanding is that recording in wav doesn't exactly make you have higher audio quality in your recordings, although the experts at codecs could better answer that. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
On Mon, Nov 22, 2010 at 03:28:27PM +, Vilius Adamkavicius wrote: Hi David, Looking at MOS G.711alaw wav most definitely has the higher score than gsm. Moreover recording in gsm is more CPU intense than wav. Therefore your suggestion to do more CPU intense recording and afterwards use system resources to convert it back to wav is not a solution. Also some of our customers require call recordings to be done in wav. wav with signed linear payload? I wonder what would happen if you record it as .sl (raw signed linear) and convert it to wav at the end of the call (while mixing). -- Tzafrir Cohen icq#16849755 jabber:tzafrir.co...@xorcom.com +972-50-7952406 mailto:tzafrir.co...@xorcom.com http://www.xorcom.com iax:gu...@local.xorcom.com/tzafrir -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
WAV or wav? One of these has GSM-encoding inside a WAV formatted envelope. That said, I wouldn't expect that to have any noticeable CPU utilization above that of GSM. If you are using the non-GSM version of WAV, then I am as baffled as you - hopefully someone who knows more about this can help. On Mon, Nov 22, 2010 at 7:58 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi Joel, We have a meetme on which we are landing two G.711 alaw calls, one coming from TDM another from SIP. Once we those parties are in the conference we are adding one more leg using Local channel and starting to record it. Surely it would be logical if it would be less overhead recording alaw wav since we are using alaw on both parties, but its not. Thanks, Vilius. On 22 November 2010 14:19, Joel Maslak jmas...@antelope.net wrote: What format are the actual calls in? Are they in G.711u/a format or are they in something else (perhaps gsm?) format? I'm asking to find out if Asterisk would need to transcode them. On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. What could be the reason for this? Is Asterisk updating wav headers every time it writes? What would be recommended hardware setup for over 60 simultaneous call records? Regards, Vilius. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Vilius Adamkavicius InVADE Technical Support 3 Berkeley Crescent, Bristol United Kingdom BS8 1HA Company Registration Number: 3660482 Registered in England and Wales this email, and any attachment, is intended only for the attention of the addressee. Its unauthorised use, disclosure, storage or copying is not permitted. If you are not the intended recipient, please destroy all copies and inform the sender by return email. If you have received this email in error, please return it to the sender and highlight the error. We accept no legal liability for the content of the message. Any opinions or views presented are solely the responsibility of the author and do not necessarily represent those of InVADE. We cannot guarantee that this message has not been modified in transit, and this message should not be viewed as contractually binding. Although we have taken reasonable steps to ensure that this email and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. international phone number +44(0) 117 33 555 00 -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] Call recording format
We are using wav, not WAV. I believe WAV is the one with GSM. Its a very good idea to compare WAV against wav, will run some tests and come back with outcome, will try Tzafrir's suggestion as well. Thanks guys Vilius. On 22 November 2010 16:31, Joel Maslak jmas...@antelope.net wrote: WAV or wav? One of these has GSM-encoding inside a WAV formatted envelope. That said, I wouldn't expect that to have any noticeable CPU utilization above that of GSM. If you are using the non-GSM version of WAV, then I am as baffled as you - hopefully someone who knows more about this can help. On Mon, Nov 22, 2010 at 7:58 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi Joel, We have a meetme on which we are landing two G.711 alaw calls, one coming from TDM another from SIP. Once we those parties are in the conference we are adding one more leg using Local channel and starting to record it. Surely it would be logical if it would be less overhead recording alaw wav since we are using alaw on both parties, but its not. Thanks, Vilius. On 22 November 2010 14:19, Joel Maslak jmas...@antelope.net wrote: What format are the actual calls in? Are they in G.711u/a format or are they in something else (perhaps gsm?) format? I'm asking to find out if Asterisk would need to transcode them. On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius vilius.adamkavic...@invade.net wrote: Hi All, We have a requirement to record over 60 simultaneous calls. Our recording facilities are implemented using Monitor() over AMI. The thing we have noticed that making 60 simultaneous call recordings using wav CPU load is significantly higher (around 2 times more) than using gsm. Even writing call recordings to /dev/null makes a big difference in CPU load. What could be the reason for this? Is Asterisk updating wav headers every time it writes? What would be recommended hardware setup for over 60 simultaneous call records? Regards, Vilius. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- Vilius Adamkavicius InVADE Technical Support 3 Berkeley Crescent, Bristol United Kingdom BS8 1HA Company Registration Number: 3660482 Registered in England and Wales this email, and any attachment, is intended only for the attention of the addressee. Its unauthorised use, disclosure, storage or copying is not permitted. If you are not the intended recipient, please destroy all copies and inform the sender by return email. If you have received this email in error, please return it to the sender and highlight the error. We accept no legal liability for the content of the message. Any opinions or views presented are solely the responsibility of the author and do not necessarily represent those of InVADE. We cannot guarantee that this message has not been modified in transit, and this message should not be viewed as contractually binding. Although we have taken reasonable steps to ensure that this email and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. international phone number +44(0) 117 33 555 00 -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk?
