[FFmpeg-user] constant rtp stram

Fri Feb 28 19:45:28 CET 2014

"the..." <ttmgybta at gmail.com> wrote:
>Yes it is always the case.
>
>The log below is a part of the csv which I exported from the wireshark
>rtp
>analyzer.
>
>As you can see from Sequence 0 to 11 we have a delta from about 0.02ms
>the
>244ms and the about 0.02 abayn and then 244ms...
>
>
>
>
>
>"Packet","Sequence","Time stamp","Delta (ms)","Jitter
>(ms)","Skew(ms)","IP
>BW (kbps)","Marker","Status"
>
>"28","0","3893850368","0.00","0.00","0.00","1.60","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"29","1","3893850528","0.02","1.25","19.98","3.20","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"30","2","3893850688","0.03","2.42","39.95","4.80","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"31","3","3893850848","0.10","3.51","59.85","6.40","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"32","4","3893851008","0.02","4.54","79.83","8.00","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"33","5","3893851168","0.08","5.50","99.75","9.60","","[ Ok
>]","02/20/2014
>16:17:57.511","214"
>
>"34","6","3893851328","0.05","6.41","119.70","11.20","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"35","7","3893851488","0.04","7.25","139.66","12.80","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"36","8","3893851648","0.08","8.04","159.59","14.40","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"37","9","3893851808","0.04","8.79","179.55","16.00","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"38","10","3893851968","0.06","9.49","199.48","17.60","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"39","11","3893852128","0.04","10.14","219.45","19.20","","[ Ok
>]","02/20/2014 16:17:57.511","214"
>
>"46","12","3893852288","244.30","23.53","-4.86","20.80","","[ Ok
>]","02/20/2014 16:17:57.755","214"
>
>"47","13","3893852448","0.05","23.30","15.09","22.40","","[ Ok
>]","02/20/2014 16:17:57.755","214"
>
>"48","14","3893852608","0.01","23.09","35.07","24.00","","[ Ok
>]","02/20/2014 16:17:57.755","214"
>
>"49","15","3893852768","0.08","22.90","54.99","25.60","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"50","16","3893852928","0.04","22.71","74.95","27.20","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"51","17","3893853088","0.07","22.54","94.89","28.80","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"52","18","3893853248","0.04","22.38","114.85","30.40","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"53","19","3893853408","0.07","22.23","134.78","32.00","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"54","20","3893853568","0.09","22.08","154.69","33.60","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"55","21","3893853728","0.04","21.95","174.65","35.20","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"56","22","3893853888","0.06","21.82","194.60","36.80","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"57","23","3893854048","0.04","21.71","214.56","38.40","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"58","24","3893854208","0.07","21.60","234.49","40.00","","[ Ok
>]","02/20/2014 16:17:57.756","214"
>
>"63","25","3893854368","255.35","34.96","-0.86","41.60","","[ Ok
>]","02/20/2014 16:17:58.011","214"
>
>"64","26","3893854528","0.05","34.02","19.09","43.20","","[ Ok
>]","02/20/2014 16:17:58.011","214"
>
>"65","27","3893854688","0.01","33.14","39.08","44.80","","[ Ok
>]","02/20/2014 16:17:58.011","214"
>
>"66","28","3893854848","0.07","32.32","59.01","46.40","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"67","29","3893855008","0.06","31.54","78.95","48.00","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"68","30","3893855168","0.06","30.82","98.89","49.60","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"69","31","3893855328","0.04","30.14","118.86","51.20","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"70","32","3893855488","0.08","29.50","138.78","52.80","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"71","33","3893855648","0.09","28.90","158.69","54.40","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"72","34","3893855808","0.04","28.34","178.65","56.00","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"73","35","3893855968","0.03","27.82","198.61","57.60","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"74","36","3893856128","0.10","27.32","218.51","59.20","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"75","37","3893856288","0.02","26.86","238.50","60.80","","[ Ok
>]","02/20/2014 16:17:58.012","214"
>
>"81","38","3893856448","255.38","39.90","3.12","62.40","","[ Ok
>]","02/20/2014 16:17:58.267","214"
>
>
>2014-02-28 17:02 GMT+01:00 Anshul <anshul.ffmpeg at gmail.com>:
>
>>
>>
>> "the..." <ttmgybta at gmail.com> wrote:
>> >We see in the tcpdump that when we stream a wav file
>> >
>> >*ffmpeg -analyzeduration 0 -re -i /tmp/test.wav -vol 512 -c g722 -ar
>> >16000
>> >-f rtp rtp://[destIP]:[destPort]*
>> >
>> >That the stream is sending in burst in to the wire.
>> >
>> >First about 12 packages in 0.6ms then about 144ms delta and then the
>> >next
>> >12 package in 0.6ms delta for about 144ms and so on...
>> >
>> >Is it possible to send the stream with a constant delta between the
>> >packages?
>> >
>> >
>> >Thanks
>> >
>> >Roman
>> >_______________________________________________
>> >ffmpeg-user mailing list
>> >ffmpeg-user at ffmpeg.org
>> >http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>>
>> Is this case is allways same? i mean have you tried many times,
>because
>> some time diffence in latency is by underlying operating system which
>have
>> an unreliable network latency.
>>
>> -Anshul
>> --

Please dont post, it become difficult for other users searching for similar problem they cant understand the context, even it for other user. Who would have helped you bur cant since the context get lost

According to ur ws log, i dont have sollution so that you can make delta equal, to me it look like one frame of audio takes 12 packet to get transmitted, so delta in 12 packet is only due network latency, while there is some time taken by transcoder for each frame so after each frame u get a bigger transcoder. 
There are 2 way to decrease delta
Either buy more fast hardware so that transcoder take less per frame time.

Keep transcodec audio at your server end, only add rtp header when you required streaming.

There is also an misunderstanding that lower the bitrate faster will be the transfer, u should keep in mind that lower is the bitrate more hardwork on encoder so lower the production of frame, whenever u have to transcoder and stream then there must be good balance of bitrate, most of the time selection of bitrate is done by system to be used.

Try -avcodec copy for not transcoding.

-Anshul
-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.