RMTP iOS, audio causes video stutter

I am currently developing a video conference app for Desktop, iOS, and Android.
I'm experiencing a problem that happens only on iOS. My app connects 2 live feeds together with rtmp. Everything works fine on the Desktop or on Android, but on iOS, whenever it recieves any audio from any of the other broadcasting clients, the video immediately pauses... and then resumes once the audio has played. Without fail, every murmur or whisper I make, immediately the video pauses, the audio plays, and then the video resumes.
I've been working on this app for a while now, since AIR 3.2... and when initially building we did not have this problem. I believe it could be because I updated the project to a more recent version of AIR, be it 3.6, 3.7, 3.8 (sadly, we didnt notice this problem until now)
Has anyone ever expierenced anything like this?
If I mute the microphone from the end that is sending it's audio to IOS, the video plays perfectly no sutter.

Hi,
Could you please provide the sample application in which issue is reproducible,so that we can investigate this at our end.
Also, please try your app with latest AIR 3.9 available at
http://www.adobe.com/devnet/air/air-sdk-download.html
Thanks,
Sakshi
Adobe AIR Team

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import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
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import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
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JButton statistics;
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pack();
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new Tx();
class TargetListModel extends AbstractListModel {
private Vector options;
public TargetListModel( Vector options) {
     this.options= options;
public int getSize() {
     int size;
     if( options == null) {
     size= 0;
     } else {
     size= options.size();
     return size;
public Object getElementAt( int index) {
String name;
if( index < getSize()) {
     Target o= (Target)options.elementAt( index);
name= o.localPort + " ---> " + o.ip + ":" + o.port;
     } else {
     name= null;
     return name;
public void setData( Vector data) {
     options= data;
     fireContentsChanged( this, 0, data.size());
class ListUpdater implements Runnable {
String localPort, ip, port;
TargetListModel listModel;
Vector targets;
public ListUpdater( String localPort, String ip, String port,
               TargetListModel listModel, Vector targets) {
     this.localPort= localPort;
     this.ip= ip;
     this.port= port;
     this.listModel= listModel;
     this.targets= targets;
public void run() {
Target target= new Target( localPort, ip, port);
     if( !targetExists( localPort, ip, port)) {
     targets.addElement( target);
listModel.setData( targets);
public boolean targetExists( String localPort, String ip, String port) {
     boolean exists= false;
     for( int i= 0; i < targets.size(); i++) {
     Target target= (Target) targets.elementAt( i);
     if( target.localPort.equals( localPort)
     && target.ip.equals( ip)
          && target.port.equals( port)) {
          exists= true;
     break;
     return exists;
>>>>>>>>>>>>>>>>>
import java.awt.*;
import java.io.*;
import java.net.InetAddress;
import java.util.*;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.format.*;
import javax.media.control.TrackControl;
import javax.media.control.QualityControl;
import javax.media.rtp.*;
import javax.media.rtp.event.*;
import javax.media.rtp.rtcp.*;
public class AVTransmitter implements ReceiveStreamListener, RemoteListener,
ControllerListener {
// Input MediaLocator
// Can be a file or http or capture source
private MediaLocator locator;
private String ipAddress;
private int portBase;
private Processor processor = null;
private RTPManager rtpMgrs[];
private int localPorts[];
private DataSource dataOutput = null;
private int local_data_port;
private Tx tx;
public AVTransmitter( Tx tx, int data_port) {
     this.tx= tx;
     local_data_port= data_port;
* Starts the transmission. Returns null if transmission started ok.
* Otherwise it returns a string with the reason why the setup failed.
public synchronized String start( String filename, Vector targets) {
     String result;
     locator= new MediaLocator( filename);
     // Create a processor for the specified media locator
     // and program it to output JPEG/RTP
     result = createProcessor();
     if (result != null) {
     return result;
     // Create an RTP session to transmit the output of the
     // processor to the specified IP address and port no.
     result = createTransmitter( targets);
     if (result != null) {
     processor.close();
     processor = null;
     return result;
     // Start the transmission
     processor.start();
     return null;
* Use the RTPManager API to create sessions for each media
* track of the processor.
private String createTransmitter( Vector targets) {
     // Cheated. Should have checked the type.
     PushBufferDataSource pbds = (PushBufferDataSource)dataOutput;
     PushBufferStream pbss[] = pbds.getStreams();
     rtpMgrs = new RTPManager[pbss.length];
     localPorts = new int[ pbss.length];
     SessionAddress localAddr, destAddr;
     InetAddress ipAddr;
     SendStream sendStream;
     int port;
     SourceDescription srcDesList[];
     for (int i = 0; i < pbss.length; i++) {
     // for (int i = 0; i < 1; i++) {
     try {
          rtpMgrs[i] = RTPManager.newInstance();
          port = local_data_port + 2*i;
          localPorts[ i]= port;
          localAddr = new SessionAddress( InetAddress.getLocalHost(),
                              port);
          rtpMgrs.initialize( localAddr);
          rtpMgrs[i].addReceiveStreamListener(this);
          rtpMgrs[i].addRemoteListener(this);
     for( int k= 0; k < targets.size(); k++) {
          Target target= (Target) targets.elementAt( k);
          int targetPort= new Integer( target.port).intValue();
          addTarget( localPorts[ i], rtpMgrs[ i], target.ip, targetPort + 2*i);
          sendStream = rtpMgrs[i].createSendStream(dataOutput, i);
          sendStream.start();
     } catch (Exception e) {
          e.printStackTrace();
          return e.getMessage();
     return null;
public void addTarget( String ip, String port) {
     for (int i= 0; i < rtpMgrs.length; i++) {
     int targetPort= new Integer( port).intValue();
     addTarget( localPorts[ i], rtpMgrs[ i], ip, targetPort + 2*i);
public void addTarget( int localPort, RTPManager mgr, String ip, int port) {
     try {
     SessionAddress addr= new SessionAddress( InetAddress.getByName( ip),
                              new Integer( port).intValue());
     mgr.addTarget( addr);
     tx.addTargetToList( localPort + "", ip, port + "");
     } catch( Exception e) {
     e.printStackTrace();
public void removeTarget( String ip, String port) {
     try {
     SessionAddress addr= new SessionAddress( InetAddress.getByName( ip),
                              new Integer( port).intValue());
     for (int i= 0; i < rtpMgrs.length; i++) {
     rtpMgrs[ i].removeTarget( addr, "target removed from transmitter.");
     } catch( Exception e) {
     e.printStackTrace();
boolean looping= true;
public void controllerUpdate( ControllerEvent ce) {
     System.out.println( ce);
     if( ce instanceof DurationUpdateEvent) {
     Time duration= ((DurationUpdateEvent) ce).getDuration();
     System.out.println( "duration: " + duration.getSeconds());
     } else if( ce instanceof EndOfMediaEvent) {
     System.out.println( "END OF MEDIA - looping=" + looping);
     if( looping) {
     processor.setMediaTime( new Time( 0));
          processor.start();
public void setLooping( boolean flag) {
     looping= flag;
public void update( ReceiveStreamEvent event) {
     String timestamp= getTimestamp();
     StringBuffer sb= new StringBuffer();
     if( event instanceof InactiveReceiveStreamEvent) {
     sb.append( timestamp + " Inactive Receive Stream");
     } else if( event instanceof ByeEvent) {
     sb.append( timestamp + " Bye");
     } else {
     System.out.println( "ReceiveStreamEvent: "+ event);
     tx.rtcpReport( sb.toString());
public void update( RemoteEvent event) {
     String timestamp= getTimestamp();
     if( event instanceof ReceiverReportEvent) {
     ReceiverReport rr= ((ReceiverReportEvent) event).getReport();
     StringBuffer sb= new StringBuffer();
     sb.append( timestamp + " RR");
     if( rr != null) {
          Participant participant= rr.getParticipant();
          if( participant != null) {
          sb.append( " from " + participant.getCNAME());
          sb.append( " ssrc=" + rr.getSSRC());
          } else {
          sb.append( " ssrc=" + rr.getSSRC());
          tx.rtcpReport( sb.toString());
     } else {
     System.out.println( "RemoteEvent: " + event);
private String getTimestamp() {
     String timestamp;
     Calendar calendar= Calendar.getInstance();
     int hour= calendar.get( Calendar.HOUR_OF_DAY);
     String hourStr= formatTime( hour);
     int minute= calendar.get( Calendar.MINUTE);
     String minuteStr= formatTime( minute);
     int second= calendar.get( Calendar.SECOND);
     String secondStr= formatTime( second);
     timestamp= hourStr + ":" + minuteStr + ":" + secondStr;
     return timestamp;
private String formatTime( int time) {
     String timeStr;
     if( time < 10) {
     timeStr= "0" + time;
     } else {
     timeStr= "" + time;
     return timeStr;
* Stops the transmission if already started
public void stop() {
     synchronized (this) {
     if (processor != null) {
          processor.stop();
          processor.close();
          processor = null;
     for (int i= 0; i < rtpMgrs.length; i++) {
     rtpMgrs[ i].removeTargets( "Session ended.");
          rtpMgrs[ i].dispose();
public String createProcessor() {
     if (locator == null) {
     return "Locator is null";
     DataSource ds;
     DataSource clone;
     try {
     ds = javax.media.Manager.createDataSource(locator);
     } catch (Exception e) {
     return "Couldn't create DataSource";
     // Try to create a processor to handle the input media locator
     try {
     processor = javax.media.Manager.createProcessor(ds);
     processor.addControllerListener( this);
     } catch (NoProcessorException npe) {
     return "Couldn't create processor";
     } catch (IOException ioe) {
     return "IOException creating processor";
     // Wait for it to configure
     boolean result = waitForState(processor, Processor.Configured);
     if (result == false)
     return "Couldn't configure processor";
     // Get the tracks from the processor
     TrackControl [] tracks = processor.getTrackControls();
     // Do we have atleast one track?
     if (tracks == null || tracks.length < 1)
     return "Couldn't find tracks in processor";
     // Set the output content descriptor to RAW_RTP
     // This will limit the supported formats reported from
     // Track.getSupportedFormats to only valid RTP formats.
     ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
     processor.setContentDescriptor(cd);
     Format supported[];
     Format chosen;
     boolean atLeastOneTrack = false;
     // Program the tracks.
     for (int i = 0; i < tracks.length; i++) {
     Format format = tracks[i].getFormat();
     if (tracks[i].isEnabled()) {
          supported = tracks[i].getSupportedFormats();
          // We've set the output content to the RAW_RTP.
          // So all the supported formats should work with RTP.
          // We'll just pick the first one.
          if (supported.length > 0) {
          if (supported[0] instanceof VideoFormat) {
               // For video formats, we should double check the
               // sizes since not all formats work in all sizes.
               chosen = checkForVideoSizes(tracks[i].getFormat(),
                                   supported[0]);
          } else
               chosen = supported[0];
          tracks[i].setFormat(chosen);
          System.err.println("Track " + i + " is set to transmit as:");
          System.err.println(" " + chosen);
          atLeastOneTrack = true;
          } else
          tracks[i].setEnabled(false);
     } else
          tracks[i].setEnabled(false);
     if (!atLeastOneTrack)
     return "Couldn't set any of the tracks to a valid RTP format";
     // Realize the processor. This will internally create a flow
     // graph and attempt to create an output datasource for JPEG/RTP
     // audio frames.
     result = waitForState(processor, Controller.Realized);
     if (result == false)
     return "Couldn't realize processor";
     // Set the JPEG quality to .5.
     setJPEGQuality(processor, 0.5f);
     // Get the output data source of the processor
     dataOutput = processor.getDataOutput();
     return null;
static SessionAddress destAddr1, destAddr2;
* For JPEG and H263, we know that they only work for particular
* sizes. So we'll perform extra checking here to make sure they
* are of the right sizes.
Format checkForVideoSizes(Format original, Format supported) {
     int width, height;
     Dimension size = ((VideoFormat)original).getSize();
     Format jpegFmt = new Format(VideoFormat.JPEG_RTP);
     Format h263Fmt = new Format(VideoFormat.H263_RTP);
     if (supported.matches(jpegFmt)) {
     // For JPEG, make sure width and height are divisible by 8.
     width = (size.width % 8 == 0 ? size.width :
                    (int)(size.width / 8) * 8);
     height = (size.height % 8 == 0 ? size.height :
                    (int)(size.height / 8) * 8);
     } else if (supported.matches(h263Fmt)) {
     // For H.263, we only support some specific sizes.
     if (size.width < 128) {
          width = 128;
          height = 96;
     } else if (size.width < 176) {
          width = 176;
          height = 144;
     } else {
          width = 352;
          height = 288;
     } else {
     // We don't know this particular format. We'll just
     // leave it alone then.
     return supported;
     return (new VideoFormat(null,
                    new Dimension(width, height),
                    Format.NOT_SPECIFIED,
                    null,
                    Format.NOT_SPECIFIED)).intersects(supported);
* Setting the encoding quality to the specified value on the JPEG encoder.
* 0.5 is a good default.
void setJPEGQuality(Player p, float val) {
     Control cs[] = p.getControls();
     QualityControl qc = null;
     VideoFormat jpegFmt = new VideoFormat(VideoFormat.JPEG);
     // Loop through the controls to find the Quality control for
     // the JPEG encoder.
     for (int i = 0; i < cs.length; i++) {
     if (cs[i] instanceof QualityControl &&
          cs[i] instanceof Owned) {
          Object owner = ((Owned)cs[i]).getOwner();
          // Check to see if the owner is a Codec.
          // Then check for the output format.
          if (owner instanceof Codec) {
          Format fmts[] = ((Codec)owner).getSupportedOutputFormats(null);
          for (int j = 0; j < fmts.length; j++) {
               if (fmts[j].matches(jpegFmt)) {
               qc = (QualityControl)cs[i];
               qc.setQuality(val);
               System.err.println("- Setting quality to " +
                         val + " on " + qc);
               break;
          if (qc != null)
          break;
* Convenience methods to handle processor's state changes.
private Integer stateLock = new Integer(0);
private boolean failed = false;
Integer getStateLock() {
     return stateLock;
void setFailed() {
     failed = true;
private synchronized boolean waitForState(Processor p, int state) {
     p.addControllerListener(new StateListener());
     failed = false;
     // Call the required method on the processor
     if (state == Processor.Configured) {
     p.configure();
     } else if (state == Processor.Realized) {
     p.realize();
     // Wait until we get an event that confirms the
     // success of the method, or a failure event.
     // See StateListener inner class
     while (p.getState() < state && !failed) {
     synchronized (getStateLock()) {
          try {
          getStateLock().wait();
          } catch (InterruptedException ie) {
          return false;
     if (failed)
     return false;
     else
     return true;
* Inner Classes
class StateListener implements ControllerListener {
     public void controllerUpdate(ControllerEvent ce) {
     // If there was an error during configure or
     // realiz

I do this all the time, I put my MBP to a 60 inch Sharp. If you have the video working do the simple thing first. Check to make sure your sound is on your TV and Mac. Then if that doesn't work go to System Prefrences and under sound go to a tab called Output and see if your TV is listed and if it is change it to that setting
Hope It Works

Ipad background audio from video when multitasking

Hello.
This is a request if people can either feedback On their present experience or try this out themselves first and feedback.
I have an ipad 1. When ever i try to get background audio to play from video when multitasking in another app, eg safari, from any video app including plex, airvideo, vlc, and the original apple video app. All that occurs is that the icon changes to the ipod and a random song is played from my music library instead of the audio from the video i was watching. This does not matter if the video file is streamed or stored on the ipad itself.
There is one slight and occasional proviso to this, as at times if the video file is tagged in itunes as 'music' rather than 'movie' or 'tv show' etc then it does on occasions work, and on occasions youtube videos will play in the background. But most of the time these aspects also dont function int he background with the ipod icon instantly replacing which ever video app icon i tried to use in the background.
Now my sons iphone 4 manages to function correctly and always plays video in the background when multitasking.
I have asked this question before on this forum, with no response, so booked a visit to my local genius bar. Where they checked my ipad and agreed it wasnt working as ios should, then interestingly they attempted to do the same on an ipad 2 and it failed to work in exactly the same way. Their response was that this was obviously a fault of the ipad ios, possibly due to the ipad having a separate video app where as the iphone has video within its generic ipod app.
I did the usual by informing apple via of this bug through the feedback system, and requested that the genius bar do the same. But having thought about this, and failed to see any other users on this forum who are also puzzled at this lack of what i think is an important function, i wonder if this means that i am the only one who likes to listen to video when im browsing, so dont need it, or wether everyone elses ipads function as ios should do, and for some reason both my ipad, and the ipad 2 tested in the shop are at fault.
So can i request if others reading this can have a go to see if their ipad will play background audio from video when multitasking, or if the same problem occurs.
Thanks very much this is really appreciated.

Oops clicked the wrong button, I meant to click a 'helpful answer' as it hard to have a correct answer to such a question.
But thanks for the replies.
It looks like this is a bug in ios solely for the ipad, as it does work fine on the iphone although wonder which way the ipod touch will perform. interestingly it looks like i may also be in the minority of wishing to listen to video files as I browse:)
Which probably means apple may never get around to sorting it, as no one else uses the function.
Anyway thanks for the replies, if any one else wants to see the bug have a go and comment, i find it funny how I seem to be the only one to have found it to date.
R:)

Does 2 firewire audio and video interface can work together on FCP ?

hello,
My audio interface is a TC Electronic Konnekt 24D
my video interface is a Canopus ADVC 110
my hard drives are plugged in firewire too
and I use Final Cut Pro 5.0.4
So, the konnekt is recognized by FCP only when the Canopus is not plugged. And even then, the audio sometimes drop out and sometimes causes the app to crash, so that I have to trash the preferences
When I plug the Canopus, the Konnekt 24D is recognised by OS X but not FCP
I want to use the voice over tool with the konnekt 24D, so what should I do ?
Does 2 firewire audio and video interface can work together ?
If so, maybe I only have a driver problem from TC Electronic.
But if not, I have to change this interface. Let me know if only RME, MOTU, Presonus and Edirol work, as it is said on apple's webpage for hardware compatibility
thanks
eMac G4 1,25 Ghz Mac OS X (10.3.9)
eMac G4 1,25 Ghz 1 Go RAM DDR Mac OS X (10.3.9)

The 1082 does show up as a possible input when I open
the VO tool.
Ok. So an audio interface can be plugged to FCP without crashing the app. Because of the Konnekt driver problem, I wasn't shure of this.
I use my Aja box for export & external monitoring.
All my audio sources run back into the Tascam and I
use the analog mixer in the 1082 to monitor different
sources.
When I view external video, the audio follows it to
keep sync.
that's exactly what I want with other I/O interfaces. I'd like to monitor video with the canopus ADVC 110, and monitor audio with the Konnekt 24D (or another interface if this one is not compatible)
I also imput dailies with a deck or a camera (DV or HDV) but that's not the point here.
I want to imput audio with the Konnekt 24D because of its audio quality. Not audio sync to video dailies. But voice over, in sync with FCP video playback (for me, tha ADVC 110)

I am trying to export a video from Premiere Pro. I have both audio and video checked and the sequence is active but only the audio exports. There is no video at all. Can anyone tell me how to get the video to export. It was working fine until today.

Premiere Pro CC has been working fine until today. I have completed my sequence and it is active. I have both audio and video checked when I am exporting using H.264 with Match Source Hi bitrate. I am choosing entire sequence. The audio exports but the video and title does not. Can anyone tell me how to troubleshoot this so I can complete this project? Please!

Greetings,
I've never seen this issue, and I handle many iPads, of all versions. WiFi issues are generally local to the WiFi router - they are not all of the same quality, range, immunity to interference, etc. You have distance, building construction, and the biggie - interference.
At home, I use Apple routers, and have no issues with any of my WiFi enabled devices, computers, mobile devices, etc - even the lowly PeeCees. I have locations where I have Juniper Networks, as well as Aruba, and a few Netgears - all of them work as they should.
The cheaper routers, Linksys, D-Link, Seimens home units, and many other no name devices have caused issues of various kinds, and even connectivity.
I have no idea what Starbucks uses, but I always have a good connection, and I go there nearly every morning and get some work done, as well as play.
You could try changing channels, 2.4 to 5 Gigs, changing locations of the router. I have had to do all of these at one time or another over the many years that I have been a Network Engineer.
Good Luck - Cheers,
M.

How do I fix out of sync audio and video on my ipad2?

How do I fix out of sync audio and video on my ipad2? The version is iOS 7.1.2

In what app?
Have you restarted or reset the device?

Audio Follows Video greyed out

I am working with a sequence that uses clips that were shot DVC Pro 720p 30, NTSC. Suddenly, when looking at interview content in the canvas and viewer, the sync for content from a particular reel is slightly off. I noticed under the view menu / audio playback, audio follows video is greyed out. The only options are default or built in output. At first I thought that was the proglem (can anyone tell me why it is greyed out, and if I need to select this somehow?)
Interestingly, however, other clips in the project, shot on the same day, do not appear to have the same sync problem. What would cause the sync problem on this one reel? I did not notice the sync problem when previously working with the material.
Thank you so much in advance.

I seem to remember this happening before with captured material. Can someone answer the question of whether I should switch the sequence settings to the settings that I used to capture the clip originally?
Or could the clip have been corrupted, and if yes, what to do? Or is the simplest solution to re-sync by eye? It's sort of like when the data flow isn't fast enough and sync is lost.
Thanks to all for your comments.

No audio with video, website navigation impaired, I can no longer recommend Firefox

I maintain the video site shaleshockmedia.org. I can no longer recommend Firefox to viewers because of the severe problem I have been experiencing: No audio with video; navigation often does not work. Maybe this is purely a local problem. Please let me know if the site is fully functional or not when you go there. There is no problem with Chrome or Safari. My computer is a Macbook Pro 3,1 Intel Core 2 Duo. MacOs 10.6.8

Note that there are a lot of popular extensions that can cause issues with videos not working apart from issues with the Flash plugin.
In what way is the navigation not working properly?
Can you give some examples?
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Check for problems with current Flash plugin versions and try these:
*disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
*disable protected mode in Flash 11.3 and later
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting

RMTP iOS, audio causes video stutter

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