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WebM live streaming via DASH

23 February 2017, by ewack

I am following the instructions here to try to make WebM live streaming via DASH. My input is from an Axis camera and it is streaming as h264 encoding. I am using node to spin up the ffmpeg processes. I am able to create the .hdr file and the .chk files. The .mpd file is even created but it’s empty and I get an error saying:

Could not write header for output file #0 (incorrect codec parameters ?): Operation not permittedStream mapping: Stream #0:0 -> #0:0 (copy)

Here’s all of my code:

var express = require('express');

spawn = require('child_process').spawn;



var app = express();



app.use(express.static(__dirname + '/public'));



app.listen(8080);

console.log("Running on Port 8080");



var ffmpeg1 = spawn('ffmpeg', [

    '-y',

    //video

    '-i', 'rtsp://admin:password@192.168.1.54:554/axis-media/media.amp?videocodec=h264&amp;resolution=1280x720',



    '-map', '0:0',

    '-pix_fmt', 'yuv420p',

    '-color_range', '2',

    '-c:v', 'libvpx-vp9',



    '-s', '1280x720',

    '-keyint_min', '25',

    '-g', '25', 



    // //VP9_LIVE_PARAMS

    '-speed', '6', 

    '-tile-columns', '4',

    '-frame-parallel', '1', 

    '-threads', '8', 

    '-static-thresh', '0', 

    '-max-intra-rate', '300',

    '-deadline', 'realtime', 

    '-lag-in-frames', '0',

    '-error-resilient', '1',



    '-f', 'webm_chunk',

    '-header', 'public/glass_360.hdr',

    '-chunk_start_index', '1',

    'public/glass_360_%d.chk',

]);





setTimeout(()=> {

  var ffmpeg2 = spawn('ffmpeg', [

    '-y',

    '-f', 'webm_dash_manifest',

    '-live', '1',

    '-i', 'public/glass_360.hdr',

    '-c', 'copy',

    '-map', '0',

    '-r', '25',

    '-framerate', '25',



    '-f', 'webm_dash_manifest',

    '-live', '1',



    '-adaptation_sets', '"id=0,streams=0"',

    '-chunk_start_index', '1',

    '-chunk_duration_ms', '2000',

    '-time_shift_buffer_depth', '7200',

    '-minimum_update_period', '7200',



    'public/glass_live_manifest.mpd'

  ]);

  ffmpeg2.stdout.on('data', 

      function (data) {

          console.log('ff2std: ' + data);

      }

  );



  ffmpeg2.stderr.on('data', 

      function (data) {

          console.log('ff2err: ' + data);

      }

  );

}, 5000);



ffmpeg1.stdout.on('data', 

    function (data) {

        console.log('ff1std: ' + data);

    }

);



ffmpeg1.stderr.on('data', 

    function (data) {

        console.log('ff1err: ' + data);

    }

);

Here is all of my output:

Running on Port 8080

ff1err: ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers

  built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda



ff1err:   libavutil      55. 34.101 / 55. 34.101

  libavcodec     57. 64.101 / 57. 64.101

  libavformat    57. 56.101 / 57. 56.101

  libavdevice    57.  1.100 / 57.  1.100

  libavfilter     6. 65.100 /  6. 65.100

  libavresample   3.  1.  0 /  3.  1.  0

  libswscale      4.  2.100 /  4.  2.100

  libswresample   2.  3.100 /  2.  3.100

  libpostproc    54.  1.100 / 54.  1.100



ff1err: Input #0, rtsp, from 'rtsp://admin:password@192.168.1.54:554/axis-media/media.amp?videocodec=h264&amp;resolution=1280x720':

  Metadata:

    title           : Session streamed with GStreamer

    comment         : rtsp-server

  Duration: N/A, start: 0.033344

ff1err: , bitrate: N/A

    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn, 180k tbc



ff1err: [swscaler @ 0x7f8df281bc00] deprecated pixel format used, make sure you did set range correctly



ff1err: [libvpx-vp9 @ 0x7f8df2800600] v1.6.1



ff1err: Output #0, webm_chunk, to 'public/glass_360_%d.chk':

  Metadata:

    title           : Session streamed with GStreamer

    comment         : rtsp-server

    encoder         : Lavf57.56.101



ff1err:     Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p(pc), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 200 kb/s, 25 fps, 1k tbn, 25 tbc

    Metadata:

      encoder         : Lavc57.64.101 libvpx-vp9

    Side data:

      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1

Stream mapping:

  Stream #0:0 -> #0:0 (h264 (native) -> vp9 (libvpx-vp9))

Press [q] to stop, [?] for help



ff1err: frame=   10 fps=0.0 q=0.0 size=N/A time=00:00:00.36 bitrate=N/A speed=0.71x    

ff1err: frame=   25 fps= 25 q=0.0 size=N/A time=00:00:00.96 bitrate=N/A speed=0.946x    

ff1err: frame=   40 fps= 26 q=0.0 size=N/A time=00:00:01.56 bitrate=N/A speed=1.03x    

ff1err: frame=   55 fps= 27 q=0.0 size=N/A time=00:00:02.16 bitrate=N/A speed=1.07x    

ff1err: frame=   70 fps= 28 q=0.0 size=N/A time=00:00:02.76 bitrate=N/A speed=1.09x    

ff1err: frame=   85 fps= 28 q=0.0 size=N/A time=00:00:03.36 bitrate=N/A speed=1.11x    

ff2err: ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers

  built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.4 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda



ff2err:   libavutil      55. 34.101 / 55. 34.101

  libavcodec     57. 64.101 / 57. 64.101

  libavformat    57. 56.101 / 57. 56.101

  libavdevice    57.  1.100 / 57.  1.100

  libavfilter     6. 65.100 /  6. 65.100

  libavresample   3.  1.  0 /  3.  1.  0

  libswscale      4.  2.100 /  4.  2.100

  libswresample   2.  3.100 /  2.  3.100

  libpostproc    54.  1.100 / 54.  1.100



ff2err: [webm_dash_manifest @ 0x7fbc5b80b400] Could not find codec parameters for stream 0 (Video: vp9, none, 1280x720): unspecified pixel format

Consider increasing the value for the 'analyzeduration' and 'probesize' options



ff2err: Input #0, webm_dash_manifest, from 'public/glass_360.hdr':

  Metadata:

    title           : Session streamed with GStreamer

    encoder         : Lavf57.56.101

  Duration: N/A, bitrate: N/A

    Stream #0:0: Video: vp9, none, 1280x720

ff2err: , SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)

    Metadata:

      webm_dash_manifest_file_name: glass_360.hdr

      webm_dash_manifest_track_number: 1



ff2err: Could not write header for output file #0 (incorrect codec parameters ?): Operation not permittedStream mapping:

  Stream #0:0 -> #0:0 (copy)



ff2err:     Last message repeated 1 times



ff1err: frame=  101 fps= 29 q=0.0 size=N/A time=00:00:04.00 bitrate=N/A speed=1.13x    

ff1err: frame=  116 fps= 29 q=0.0 size=N/A time=00:00:04.60 bitrate=N/A speed=1.14x    

ff1err: frame=  131 fps= 29 q=0.0 size=N/A time=00:00:05.20 bitrate=N/A speed=1.15x    

ff1err: frame=  146 fps= 29 q=0.0 size=N/A time=00:00:05.80 bitrate=N/A speed=1.15x    

ff1err: frame=  161 fps= 29 q=0.0 size=N/A time=00:00:06.40 bitrate=N/A speed=1.15x    

ff1err: frame=  177 fps= 29 q=0.0 size=N/A time=00:00:07.04 bitrate=N/A speed=1.16x    

ff1err: frame=  192 fps= 29 q=0.0 size=N/A time=00:00:07.64 bitrate=N/A speed=1.16x    

ff1err: frame=  207 fps= 29 q=0.0 size=N/A time=00:00:08.24 bitrate=N/A speed=1.16x    

ff1err: frame=  222 fps= 29 q=0.0 size=N/A time=00:00:08.84 bitrate=N/A speed=1.17x    

ff1err: frame=  237 fps= 29 q=0.0 size=N/A time=00:00:09.44 bitrate=N/A speed=1.17x    

ff1err: frame=  252 fps= 29 q=0.0 size=N/A time=00:00:10.04 bitrate=N/A speed=1.17x

Why is ffmpeg creating an empty .mpd file?

bash script to install / update ffmpeg static builds

1 March 2017, by Joakim

Hi I’m trying to make my first "real" bash script to do some real work than can be executed both manually and through cron jobs.

The script should download and install the ffmpeg-static-build from https://johnvansickle.com/ffmpeg

Here is what I’ve got so far:

#!/bin/bash

# Still to come, see if the script runs with root privileges else exit

#Download FFMPEG static daily build and it's md5

cd ~

wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | tar -xf

#wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5

curl -L https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5 | tar -xf | tee -a https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | cut -d\  -f1 | md5sum > md5sum.txt





#Chech the md5 is currect

#md5sum -c MD5SUMS

file1="md5sum.txt"

file2="ffmpeg-git-64bit-static.tar.xz.md5"



if ! cmp --silent "$file1" "$file2"; then

    echo "md5sum doesn't match...\n exit" >&amp;2

    exit 1

fi





#tar -xf ffmpeg-*.tar.xz

cp ffmpeg-*-static/ff* /usr/bin/

cp ffmpeg-*-static/ff* /usr/local/bin/

cp ffmpeg-*-static/qt-faststart /usr/bin/

cp ffmpeg-*-static/qt-faststart /usr/local/bin/

# Consider change second location to use ln -s

# Remove downloads and do some clean up



rm -fr ffmpeg-*



#EOF

As you can see in the script i would like to add the md5sum check but it fails (got the md5sum check part from Compare md5 sums in bash script)

If i remove the md5sum part the script is working, but right now the script fails at the | tar -xf | part with this code

2017-02-28 00:10:24 (617 KB/s) - ‘ffmpeg-git-64bit-static.tar.xz’ saved [17564756/17564756]



tar: option requires an argument -- 'f'

Try 'tar --help' or 'tar --usage' for more information.

tee: 'https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz': No such file or directory

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

100    65  100    65    0     0     87      0 --:--:-- --:--:-- --:--:--    87

(23) Failed writing body

md5sum doesn't match...

 exit

As this is my first, I would appreciate any "I’m 4 years old" advices and why

update

Have made some changes to the script based on the suggestions in this thread, but my problem is I have no output what so ever at this state :( So I think it’s time to ask for the next clue

#!/bin/bash



# version 0.3z



## Download FFMPEG static daily build and it's md5

## 

## To make this script working you might need to change the below values

## based on whether you are using a 32bit or 64 bit OS

## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/

## and then change those below

## 

## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment

## point 5.





# a "~" means running users home folder :) and should be different from destination dir

download_dir=~



# as this can change if the ffmpeg is to be stored on ex. shared server

dest_dir=/usr/bin/



# The version it equal the filename from above link

version=ffmpeg-git-64bit-static.tar.xz



## Do not change anything below here!!

source_url=https://johnvansickle.com/ffmpeg/builds/${version}

md5_url=https://johnvansickle.com/ffmpeg/builds/${version}.md5



# Still to come, see if the script runs with write privileges else exit



# 1. Can we enter download directory else exit

cd ${download_dir} ||



        printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&amp;2

        exit 1



# 2. Check the md5 is correct or have changed from last check

## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,

## regardless if it is new or not, I recommend only downloading it

## if the md5 does not match. Would save John some bandwidth at least

## thx for the idea to @LordNeckbeard







## So somehow i'll guess some sed or grep only first part is nessesary :(

## This is getting more advance than expected for a first time script :/



if ! diff &lt;(md5sum ${version}) &lt;(curl -s ${md5_url})



    then

        printf "%s\n" "md5sum doesn't match...\n

                        Downloading new version" >&amp;2

        rm -f ${version} >&amp;2

        curl ${source_url} -o ${download_dir}/${version} >&amp;2

        #exit 2



    elif

        diff &lt;(md5sum ${version}) &lt;(curl -s ${md5_url})

        printf "%s\n" "Nothing new to download" >&amp;2

      exit 3

fi



# 3. untar

tar -xf ffmpeg-git-*-static.tar.xz



# 4. Move builds to destination directories



mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/

mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/



# 5. Make soft links to static builds

ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart

ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg

ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit

ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe

ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver



# Remove unzipped folder to do some clean up



rm -fr ffmpeg-git-*-static/



#EOF

note: do to some more in depth answering of why not compile from source:
1. This precompiled is usable on all Linux variations, despite distro and version
2. It usable on shared hosting servers with ssh access

UPDATE 2

    #!/bin/bash



# version 0.4z



## Download FFMPEG static daily build and it's md5

## 

## To make this script working you might need to change the below values

## based on whether you are using a 32bit or 64 bit OS

## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/

## and then change those below

## 

## Finished and working script should be distributed under GPLv3: free as in freedom

## 

## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment

## point 5.





# a "~" means running users home folder :) and should be different from destination dir

download_dir=~



# as this can change if the ffmpeg is to be stored on ex. shared server

dest_dir=/usr/bin/



# The version it equal the filename from above link

version=ffmpeg-git-64bit-static.tar.xz



## Do not change anything below here!!

source_url=https://johnvansickle.com/ffmpeg/builds/${version}

md5="curl -s https://johnvansickle.com/ffmpeg/builds/${version}.md5"



# Still to come, see if the script runs with write privileges else exit



# 1. Can we enter download directory else exit

cd ${download_dir} || 

        printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&amp;2

        exit 1



# 2. Check the md5 is correct or have changed from last check

## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,

## regardless if it is new or not, I recommend only downloading it

## if the md5 does not match. Would save John some bandwidth at least

## thx for the idea to @LordNeckbeard



## This is getting more advance than expected for a first time script :/



if diff &lt;(md5sum ${version}) &lt;(${md5})



    then

        printf "%s\n" "No new version availeble" >&amp;2

        exit 1



elif ! diff &lt;(md5sum ${version}) &lt;(${md5})

    then

        rm -f ${version}

        curl ${source_url} > ${version}

        exit 0



        #only proceed if downloaded version match it's md5

        if ! diff &lt;(md5sum ${version}) &lt;(${md5})

            then

            rm -f ${version}

            printf "%s\n" "Downloaded version is damaged, try later\ndamaged version have been deleted" >&amp;2

            exit 1

        fi



            # 3. untar

            tar -xf ffmpeg-git-*-static.tar.xz



            # 4. Move builds to destination directories

            mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/

            mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/



            # 5. Make soft links to static builds

            ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart

            ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg

            ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit

            ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe

            ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver



            # Remove unzipped folder to do some clean up

            rm -fr ffmpeg-git-*-static/

            printf "%s\n" "Going to install new version" >&amp;2

            exit 1

fi

#EOF

But still having some issues :(

Running this script returns: a blanc shell, but I’ve expected one of the printf statements
When I’m trying to narrow down the problem and going back to basic and trying to run the script with only the "if" part it fails with 44: Syntax error: "(" unexpected
running the very same "if" part typed directly into the shell/terminal itself it’s all happy!!
if diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then printf "%s\n" "No new version availeble" >&2; elif ! diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then rm -f ffmpeg-git-64bit-static.tar.xz; curl https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz > ffmpeg-git-64bit-static.tar.xz; printf "%s\n" "Going to install new version" >&2; fi
I’m confused

RTP packets detected as UDP

28 February 2017, by user3172852

Here is what I am trying to do:

WebRTC endpoint > RTP Endpoint > ffmpeg > RTMP server.

This is what my SDP file looks like.

var cm_offer = "v=0\n" +

              "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +

              "s=nginx\n" +

              "c=IN IP4 127.0.0.1\n" +

              "t=0 0\n" +

              "m=audio 60820 RTP/AVP 0\n" +

              "a=rtpmap:0 PCMU/8000\n" +

              "a=recvonly\n" +

              "m=video 59618 RTP/AVP 101\n" +

              "a=rtpmap:101 H264/90000\n" +

              "a=recvonly\n";

What’s happening is that wireshark can detect the incoming packets at port 59618, but not as RTP packets but UDP packets. I am trying to capture the packets using ffmpeg with the following command:

ubuntu@ip-132-31-40-100:~$ ffmpeg -i udp://127.0.0.1:59618 -vcodec copy stream.mp4

ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers

  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)

  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc

  libavutil      55. 44.100 / 55. 44.100

  libavcodec     57. 75.100 / 57. 75.100

  libavformat    57. 63.100 / 57. 63.100

  libavdevice    57.  2.100 / 57.  2.100

  libavfilter     6. 69.100 /  6. 69.100

  libavresample   3.  2.  0 /  3.  2.  0

  libswscale      4.  3.101 /  4.  3.101

  libswresample   2.  4.100 /  2.  4.100

  libpostproc    54.  2.100 / 54.  2.100

All I get is a blinking cursor and The stream.mp4 file is not written to disk after I exit (ctrl+c).

So can you help me figure out:

why wireshark cannot detect the packets as RTP (I suspect it has something to do with SDP)
How to handle SDP answer when the RTP endpoint is pushing to ffmpeg which doesn’t send an answer back.

Here is the entire code (hello world tutorial modified)

/*

     * (C) Copyright 2014-2015 Kurento (http://kurento.org/)

     *

     * Licensed under the Apache License, Version 2.0 (the "License");

     * you may not use this file except in compliance with the License.

     * You may obtain a copy of the License at

     *

     *   http://www.apache.org/licenses/LICENSE-2.0

     *

     * Unless required by applicable law or agreed to in writing, software

     * distributed under the License is distributed on an "AS IS" BASIS,

     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

     * See the License for the specific language governing permissions and

     * limitations under the License.

     */



    function getopts(args, opts)

    {

      var result = opts.default || {};

      args.replace(

          new RegExp("([^?=&amp;]+)(=([^&amp;]*))?", "g"),

          function($0, $1, $2, $3) { result[$1] = decodeURI($3); });



      return result;

    };



    var args = getopts(location.search,

    {

      default:

      {

        ws_uri: 'wss://' + location.hostname + ':8433/kurento',

        ice_servers: undefined

      }

    });



    function setIceCandidateCallbacks(webRtcPeer, webRtcEp, onerror)

    {

      webRtcPeer.on('icecandidate', function(candidate) {

        console.log("Local candidate:",candidate);



        candidate = kurentoClient.getComplexType('IceCandidate')(candidate);



        webRtcEp.addIceCandidate(candidate, onerror)

      });



      webRtcEp.on('OnIceCandidate', function(event) {

        var candidate = event.candidate;



        console.log("Remote candidate:",candidate);



        webRtcPeer.addIceCandidate(candidate, onerror);

      });

    }





    function setIceCandidateCallbacks2(webRtcPeer, rtpEp, onerror)

    {

      webRtcPeer.on('icecandidate', function(candidate) {

        console.log("Localr candidate:",candidate);



        candidate = kurentoClient.getComplexType('IceCandidate')(candidate);



        rtpEp.addIceCandidate(candidate, onerror)

      });

    }





    window.addEventListener('load', function()

    {

      console = new Console();



      var webRtcPeer;

      var pipeline;

      var webRtcEpt;



      var videoInput = document.getElementById('videoInput');

      var videoOutput = document.getElementById('videoOutput');



      var startButton = document.getElementById("start");

      var stopButton = document.getElementById("stop");



      startButton.addEventListener("click", function()

      {

        showSpinner(videoInput, videoOutput);



        var options = {

          localVideo: videoInput,

          remoteVideo: videoOutput

        };





        if (args.ice_servers) {

         console.log("Use ICE servers: " + args.ice_servers);

         options.configuration = {

           iceServers : JSON.parse(args.ice_servers)

         };

        } else {

         console.log("Use freeice")

        }



        webRtcPeer = kurentoUtils.WebRtcPeer.WebRtcPeerSendrecv(options, function(error)

        {

          if(error) return onError(error)



          this.generateOffer(onOffer)

        });



        function onOffer(error, sdpOffer)

        {

          if(error) return onError(error)



          kurentoClient(args.ws_uri, function(error, client)

          {

            if(error) return onError(error);



            client.create("MediaPipeline", function(error, _pipeline)

            {

              if(error) return onError(error);



              pipeline = _pipeline;



              pipeline.create("WebRtcEndpoint", function(error, webRtc){

                if(error) return onError(error);



                webRtcEpt = webRtc;



                setIceCandidateCallbacks(webRtcPeer, webRtc, onError)



                webRtc.processOffer(sdpOffer, function(error, sdpAnswer){

                  if(error) return onError(error);



                  webRtcPeer.processAnswer(sdpAnswer, onError);

                });

                webRtc.gatherCandidates(onError);



                webRtc.connect(webRtc, function(error){

                  if(error) return onError(error);



                  console.log("Loopback established");

                });

              });







            pipeline.create("RtpEndpoint", function(error, rtp){

                if(error) return onError(error);



                //setIceCandidateCallbacks2(webRtcPeer, rtp, onError)





                var cm_offer = "v=0\n" +

                      "o=- 3641290734 3641290734 IN IP4 127.0.0.1\n" +

                      "s=nginx\n" +

                      "c=IN IP4 127.0.0.1\n" +

                      "t=0 0\n" +

                      "m=audio 60820 RTP/AVP 0\n" +

                      "a=rtpmap:0 PCMU/8000\n" +

                      "a=recvonly\n" +

                      "m=video 59618 RTP/AVP 101\n" +

                      "a=rtpmap:101 H264/90000\n" +

                      "a=recvonly\n";







                rtp.processOffer(cm_offer, function(error, cm_sdpAnswer){

                  if(error) return onError(error);



                  //webRtcPeer.processAnswer(cm_sdpAnswer, onError);

                });

                //rtp.gatherCandidates(onError);



                webRtcEpt.connect(rtp, function(error){

                  if(error) return onError(error);



                  console.log("RTP endpoint connected to webRTC");

                });

              });



















            });

          });

        }

      });

      stopButton.addEventListener("click", stop);





      function stop() {

        if (webRtcPeer) {

          webRtcPeer.dispose();

          webRtcPeer = null;

        }



        if(pipeline){

          pipeline.release();

          pipeline = null;

        }



        hideSpinner(videoInput, videoOutput);

      }



      function onError(error) {

        if(error)

        {

          console.error(error);

          stop();

        }

      }

    })





    function showSpinner() {

      for (var i = 0; i &lt; arguments.length; i++) {

        arguments[i].poster = 'img/transparent-1px.png';

        arguments[i].style.background = "center transparent url('img/spinner.gif') no-repeat";

      }

    }



    function hideSpinner() {

      for (var i = 0; i &lt; arguments.length; i++) {

        arguments[i].src = '';

        arguments[i].poster = 'img/webrtc.png';

        arguments[i].style.background = '';

      }

    }



    /**

     * Lightbox utility (to display media pipeline image in a modal dialog)

     */

    $(document).delegate('*[data-toggle="lightbox"]', 'click', function(event) {

      event.preventDefault();

      $(this).ekkoLightbox();

    });

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