Imagine playing a 44.1 kHz mp3 file !!!
Yesterday, I saw someone storing his audio prompt files in 44.1 kHz mp3 for playback !!! I am still recovering from the shock! What will be the correct format to keep prompts in if we are connected via FreeTDM to an E1: GSM or PCMA? regards, Anita
Anita, I would imagine that your best bet is PCMA. E1's are natively using PCM as their audio on the wire and the less transcoding you do, the better. Anyone with better understanding then mine, please feel free to correct me if I am wrong. Regards, -- João Mesquita Sent with Sparrow (http://www.sparrowmailapp.com/?sig) On Sunday, February 26, 2012 at 7:15 PM, Anita Hall wrote:
Yesterday, I saw someone storing his audio prompt files in 44.1 kHz mp3 for playback !!! I am still recovering from the shock!
What will be the correct format to keep prompts in if we are connected via FreeTDM to an E1:
GSM or PCMA?
regards, Anita
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On 02/27/2012 06:15 AM, Anita Hall wrote:
Yesterday, I saw someone storing his audio prompt files in 44.1 kHz mp3 for playback !!! I am still recovering from the shock!
What will be the correct format to keep prompts in if we are connected via FreeTDM to an E1:
GSM or PCMA?
regards, Anita I'm shocked. You don't want to store your prompts in a wideband format, and be prepared for the future? :-)
If you have a pure E1 system, use PCMA. That is the codec for E1s. GSM will give poorer quality and require transcoding. Steve
in some hybrid codec scenarios, Ive seen people suggest Signed Linear.. this saves transcoding from PCMA to SLIN then to G729 for instance.. On 27 February 2012 11:09, Steve Underwood <steveu@coppice.org> wrote:
On 02/27/2012 06:15 AM, Anita Hall wrote:
Yesterday, I saw someone storing his audio prompt files in 44.1 kHz mp3 for playback !!! I am still recovering from the shock!
What will be the correct format to keep prompts in if we are connected via FreeTDM to an E1:
GSM or PCMA?
regards, Anita I'm shocked. You don't want to store your prompts in a wideband format, and be prepared for the future? :-)
If you have a pure E1 system, use PCMA. That is the codec for E1s. GSM will give poorer quality and require transcoding.
Steve
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-- Sincerely Jay
Hi Anita, As far, I have played with FS. I could notice that FS try to choose the format acording to the media, at least I saw this in my box. Someone from FS, could validate this. Recently, I loaded a set of mexican prompts, all them were in 44KHz format, when I tested, I notice in FS console, FS "converted on fly" to 8KHz. It is a good idea to have your prompts in all formats (44, 32, 16, 8KHz, gsm, linear), if your box have enough space too keep all your prompts. However, each media have their own restrictions (not FS restrictions). In TDM world, PCMA and PCMU (the correct is u-law and A-law codec) are used. Other media like GSM and SIP/H.323 used other formats, including PCMA and PCMU. The best practice, is to avoid transcoding as possible, to not demand more processing resources. On 2/26/2012 5:45 PM, Anita Hall wrote:
Yesterday, I saw someone storing his audio prompt files in 44.1 kHz mp3 for playback !!! I am still recovering from the shock!
What will be the correct format to keep prompts in if we are connected via FreeTDM to an E1:
GSM or PCMA?
regards, Anita
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com
Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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participants (5)
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Anita Hall
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jay binks
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João Mesquita
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Saugort Dario Garcia Tovar
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Steve Underwood