Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
Third, those complaining of low volume in emailed files are usually using a compressed format. In the uncompressed wav format, the volume is effectively doubled by shifting the audio data to the left one bit. This is done at the format level. Of course on playback via asterisk, it checks to see if it needs to shift the audio down and does so. So playback between asterisk recorded wav files should all sound the same on asterisk but isn't the same when played via a normal audio app. The complaints come mainly regarding the emailed attachements, which are WAV49 (MS-GSM) files, which (as far as I can tell) are just justified right and packed into 65 bytes per the IETF I-D. These files are not played back within Asterisk, and honestly, most of what you said above here is rubbish. I just spent more time than I ever cared to spend (including studying the actual GSM codec spec from the ETSI), learning more than I ever cared to learn about GSM (which, btw, if you are concerned about patents, is just as subject to them if you believe Philips' claims), and the difference between uncompressed WAV files (which also suffer from attenuated signal levels) and the GSM and/or MS-GSM files is far far more than just shifting the audio data to the left one bit. There is an issue surrounding the recording of data through Asterisk. That is inarguable. The problem is that no one seems to agree on where to begin looking, so no one has, really. I don't know the origin of the GSM files that make up the Comedian VM system prompts, but they do not suffer from this problem. However, GSM files generated by the VM system, at the least, have a signal attenuation problem to the point that the emailed attachments are unusable, and by most accounts, the phoned-in VM retrieval is barely useful to boot. Not only am I willing to try to track this down, I am furiously taken with the task, because it's a real issue that needs to be addressed, and I do understand that the actual devs have more important things to fix first. That's one of the nice things about open-source, eh? ;) ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
Steven Critchfield wrote: Second, read the rants on licensing. Unless you find a BSD licensed mp3 encoding library and convince Mark of it's need, it is unlikely to make it to the core code base. When snackAmp blew up on GSM-encoded wav files I did some cursory research and found FLAC: http://flac.sourceforge.net/ The license for the libraries is a BSD-variant. I'm not an expert on audio formats so no flames please. Regards, -- Jason Becker Director CEO Coalescent Systems Inc. 403.244.8089 www.coalescentsystems.ca ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[Asterisk-Users] Low Volume WAV Files in Email Attachments
I have read several posts regarding this problem but can't find one with a solution... I see the same issue: Voicemails picked up by handset have normal volume, but voicemail sent as a wav attachments in email are so low they are barely usable... Is there a way to fix the volume before they are emailed out? Thanks for any tips. ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
Philippe Daoust wrote: I have read several posts regarding this problem but can't find one with a solution... I see the same issue: Voicemails picked up by handset have normal volume, but voicemail sent as a wav attachments in email are so low they are barely usable... Is there a way to fix the volume before they are emailed out? Thanks for any tips. Sign up and join the fun in bug #2023... http://bugs.digium.com/bug_view_page.php?bug_id=0002023 I'd also recommend emailing support at digium - not because you'll get anywhere, but to keep them aware that people are interested in getting this fixed. I've got the same problem and emailed support last week and got very little to encourage me that it's any kind of priority. What are you using for telephone hardware? Your situation is a little different in that you say the voicemails play back at decent volume over the phone - are you testing with voicemails left through a POTS line connection in all cases? I'm pretty new myself, but I've got C skills and am planning to get back to looking over the code myself soon. Steve ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
I'm taking a look at the functions involved to see what the issue is, if anyone cares. One question thowith all of the sound libraries on the planet, ones that write to far mroe open formats, such as MP3, which are just as acceptable as email attachments, and _have_ to be easier to deal with... But I digressI'll dive in and snoop around format_wav_gsm anyway. Greg Steve Prior wrote: Philippe Daoust wrote: I have read several posts regarding this problem but can't find one with a solution... I see the same issue: Voicemails picked up by handset have normal volume, but voicemail sent as a wav attachments in email are so low they are barely usable... Is there a way to fix the volume before they are emailed out? Thanks for any tips. Sign up and join the fun in bug #2023... http://bugs.digium.com/bug_view_page.php?bug_id=0002023 I'd also recommend emailing support at digium - not because you'll get anywhere, but to keep them aware that people are interested in getting this fixed. I've got the same problem and emailed support last week and got very little to encourage me that it's any kind of priority. What are you using for telephone hardware? Your situation is a little different in that you say the voicemails play back at decent volume over the phone - are you testing with voicemails left through a POTS line connection in all cases? I'm pretty new myself, but I've got C skills and am planning to get back to looking over the code myself soon. Steve ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
On Sat, 2004-11-27 at 18:21 -0500, Gregory Junker wrote: I'm taking a look at the functions involved to see what the issue is, if anyone cares. One question thowith all of the sound libraries on the planet, ones that write to far mroe open formats, such as MP3, which are just as acceptable as email attachments, and _have_ to be easier to deal with... First, mp3 is patent encumbered. Also it seems most patent enforcement is aimed at the encoders and not the decoders. Much like the way WMP and Real work, those producing content can afford to pay for the work. Second, read the rants on licensing. Unless you find a BSD licensed mp3 encoding library and convince Mark of it's need, it is unlikely to make it to the core code base. Third, those complaining of low volume in emailed files are usually using a compressed format. In the uncompressed wav format, the volume is effectively doubled by shifting the audio data to the left one bit. This is done at the format level. Of course on playback via asterisk, it checks to see if it needs to shift the audio down and does so. So playback between asterisk recorded wav files should all sound the same on asterisk but isn't the same when played via a normal audio app. I wouldn't mind seeing someone place a audio adjustment in the voicemail app and make it adjustable. Then remove what I suspect is a crude hack in format_wav.c But I digressI'll dive in and snoop around format_wav_gsm anyway. -- Steven Critchfield [EMAIL PROTECTED] ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] Low Volume WAV Files in Email Attachments
[SNIP] What are you using for telephone hardware? Your situation is a little different in that you say the voicemails play back at decent volume over the phone - are you testing with voicemails left through a POTS line connection in all cases? I tried it with a Cisco 7960, SPA-2000 and Panasonic cordless connected to a Digium 4 port FXS board and get good volumes. Most of the times the VM's are left from people calling my POTS line via a Digium FXO board. Thanks for the reply. Glad to see some folks are looking into this. I am available to test if that helps... unfortunately my C coding skills are extremely rusty... -Regards, ___ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
