tag:blogger.com,1999:blog-9031922773224056133.post2152901845592929562..comments2024-02-17T09:14:34.972+01:00Comments on Giacomo Vacca: The sound of silence (encoded with G.711)Giacomo Vaccahttp://www.blogger.com/profile/15806655752624396579noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-9031922773224056133.post-9350906333664342392017-10-09T14:53:34.042+02:002017-10-09T14:53:34.042+02:00What about other silence RTP packets for G272 or G...What about other silence RTP packets for G272 or G723 or G729?<br /><br />I have learnt that silence packets may be 0x55,0x56,0xD5,0xD6 for G711 by analyzing recorded pcap for g711 codec, but any information the rtp content for the other codecsİbrahim Delibaşoğluhttps://www.blogger.com/profile/01013883334760017796noreply@blogger.comtag:blogger.com,1999:blog-9031922773224056133.post-19517090776592669602017-01-04T14:07:20.946+01:002017-01-04T14:07:20.946+01:00I am having this same problem. Have you found any ...I am having this same problem. Have you found any solutions?<br /><br />I will thank you very much any recommendations you can give me.<br /><br />Sorry for my English.<br /><br />Sincerely, Diego<br />Diegohttps://www.blogger.com/profile/03044115117199107984noreply@blogger.comtag:blogger.com,1999:blog-9031922773224056133.post-53304738928980754322016-04-21T14:42:51.856+02:002016-04-21T14:42:51.856+02:00Ah, that's a very good question. I think you c...Ah, that's a very good question. I think you can find your answer here: http://www.itu.int/rec/T-REC-G.711/<br />but you need to consider a subtle detail:<br /><br />"The input signals to an A-law decoder will normally include even bit inversion as applied in accordance with [...]"<br /><br />So it's easier to see it this way:<br /><br />0x55 == 0b01010101<br /><br />0b01010101 == 0b00000000 with even bits inverted.<br /><br />0xD5 == 0b11010101<br /><br />which is the same as above, but with the sign bit (leftmost) set to 1.<br /><br />I hope this is a better and more useful explanation.<br />Cheers,<br />GiaccomoGiacomo Vaccahttps://www.blogger.com/profile/15806655752624396579noreply@blogger.comtag:blogger.com,1999:blog-9031922773224056133.post-30368478951996844682016-04-21T11:36:15.717+02:002016-04-21T11:36:15.717+02:00Hello Giacomo,
I'm facing the seame issue.
I ...Hello Giacomo,<br /><br />I'm facing the seame issue.<br />I have no signs of CN negotiation in my SDP.<br />Where did you find the official explanation thaht in a-law silence is either a payload entirely populated with 0x55 or 0xD5. I tried to read many RFC, but I might to much smartless :)<br /><br />Thanks,Unknownhttps://www.blogger.com/profile/11481740234503829607noreply@blogger.com