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Lip Sync issues with gstrtpbin

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Rahul Mittal

Lip Sync issues with gstrtpbin

Hi Guys
I am making an application which takes as an input live RTP streams and gives muxed output.
The problem is tht i am getting Audio delayed relative to the video by almost a second.
I can see that the RTCP reports are being exchanged to and fo between the gstreamer rtpbin and the RTP live stream server.
Can anyone help me on this.

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Wim Taymans

Re: Lip Sync issues with gstrtpbin

On Wed, 2008-05-14 at 16:26 +0530, Rahul Mittal wrote:
> Hi Guys
> I am making an application which takes as an input live RTP streams
> and gives muxed output.
> The problem is tht i am getting Audio delayed relative to the video by
> almost a second.
> I can see that the RTCP reports are being exchanged to and fo between
> the gstreamer rtpbin and the RTP live stream server.
> Can anyone help me on this.

Assuming you don't do anything weird with the pipeline so that the
latency is calculated correctly and you are not bitten by this bug:
http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/gst/rtpmanager/gstrtpbin.c?view=log
it should work.

Wim

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Yann Gilquin

Re: Lip Sync issues with gstrtpbin

Wim Taymans wrote:

> On Wed, 2008-05-14 at 16:26 +0530, Rahul Mittal wrote:
>
>> Hi Guys
>> I am making an application which takes as an input live RTP streams
>> and gives muxed output.
>> The problem is tht i am getting Audio delayed relative to the video by
>> almost a second.
>> I can see that the RTCP reports are being exchanged to and fo between
>> the gstreamer rtpbin and the RTP live stream server.
>> Can anyone help me on this.
>>
>
> Assuming you don't do anything weird with the pipeline so that the
> latency is calculated correctly and you are not bitten by this bug:
> http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/gst/rtpmanager/gstrtpbin.c?view=log
> it should work.
>
> Wim
>
>

Hi Wim,
are you talking about rev1.46:1.47 commits or something older ?

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>
>
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>

--
Yann Gilquin

Purple Labs S.A.
www.purplelabs.com

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Wim Taymans

Re: Lip Sync issues with gstrtpbin

On Wed, 2008-05-14 at 13:47 +0200, Yann Gilquin wrote:

> Wim Taymans wrote:
> > On Wed, 2008-05-14 at 16:26 +0530, Rahul Mittal wrote:
> >
> >> Hi Guys
> >> I am making an application which takes as an input live RTP streams
> >> and gives muxed output.
> >> The problem is tht i am getting Audio delayed relative to the video by
> >> almost a second.
> >> I can see that the RTCP reports are being exchanged to and fo between
> >> the gstreamer rtpbin and the RTP live stream server.
> >> Can anyone help me on this.
> >>
> >
> > Assuming you don't do anything weird with the pipeline so that the
> > latency is calculated correctly and you are not bitten by this bug:
> > http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/gst/rtpmanager/gstrtpbin.c?view=log
> > it should work.
> >
> > Wim
> >
> >
>
> Hi Wim,
> are you talking about rev1.46:1.47 commits or something older ?

revision 1.45 contains an important fix for sync. It will not sync
properly if the first audio and video packets do not arrive in the
receiver at the same time.

Wim

>
>
> >> -------------------------------------------------------------------------
> >> This SF.net email is sponsored by: Microsoft
> >> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> >>
> >
> >
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> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >
> >
>
>

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Rahul Mittal

Re: Lip Sync issues with gstrtpbin

hi Guys,
Thanx for the input.
I just went through the link that u sent and i tried comparing the gstrtpbin.c that i have and the fixed one and i could see some differences there so i am assuming that the verion that i have may not be fixed.
But can any1 tell me how to apply this fix since i am a bit new to this.
right now i am using gstreamer version 0.10.15

On 5/14/08, Wim Taymans <[hidden email]> wrote:

On Wed, 2008-05-14 at 13:47 +0200, Yann Gilquin wrote:
> Wim Taymans wrote:
> > On Wed, 2008-05-14 at 16:26 +0530, Rahul Mittal wrote:
> >
> >> Hi Guys
> >> I am making an application which takes as an input live RTP streams
> >> and gives muxed output.
> >> The problem is tht i am getting Audio delayed relative to the video by
> >> almost a second.
> >> I can see that the RTCP reports are being exchanged to and fo between
> >> the gstreamer rtpbin and the RTP live stream server.
> >> Can anyone help me on this.
> >>
> >
> > Assuming you don't do anything weird with the pipeline so that the
> > latency is calculated correctly and you are not bitten by this bug:
> > http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/gst/rtpmanager/gstrtpbin.c?view=log
> > it should work.
> >
> > Wim
> >
> >
>
> Hi Wim,
> are you talking about rev1.46:1.47 commits or something older ?

revision 1.45 contains an important fix for sync. It will not sync
properly if the first audio and video packets do not arrive in the
receiver at the same time.

Wim

>
>
> >> -------------------------------------------------------------------------
> >> This SF.net email is sponsored by: Microsoft
> >> Defy all challenges. Microsoft(R) Visual Studio 2008.
> >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> >> _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >>
> >
> >
> > -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Microsoft
> > Defy all challenges. Microsoft(R) Visual Studio 2008.
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> > [hidden email]
> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >
> >
>
>

Manish Rana

Re: Lip Sync issues with gstrtpbin

In addition to the problem faced by Rahul, I am also getting delay in RTP packets
When i am transmitting and receiving the packets between two device connected through USB i am getting delay of more then 1 sec, in case of audio ( alone , no video is there. )
I am using the latest gstreamer packeges.

- Manish

On Thu, May 15, 2008 at 10:22 AM, Rahul Mittal <[hidden email]> wrote:

hi Guys,
Thanx for the input.
I just went through the link that u sent and i tried comparing the gstrtpbin.c that i have and the fixed one and i could see some differences there so i am assuming that the verion that i have may not be fixed.
But can any1 tell me how to apply this fix since i am a bit new to this.
right now i am using gstreamer version 0.10.15

On 5/14/08, Wim Taymans <[hidden email]> wrote:
On Wed, 2008-05-14 at 13:47 +0200, Yann Gilquin wrote:
> Wim Taymans wrote:
> > On Wed, 2008-05-14 at 16:26 +0530, Rahul Mittal wrote:
> >
> >> Hi Guys
> >> I am making an application which takes as an input live RTP streams
> >> and gives muxed output.
> >> The problem is tht i am getting Audio delayed relative to the video by
> >> almost a second.
> >> I can see that the RTCP reports are being exchanged to and fo between
> >> the gstreamer rtpbin and the RTP live stream server.
> >> Can anyone help me on this.
> >>
> >
> > Assuming you don't do anything weird with the pipeline so that the
> > latency is calculated correctly and you are not bitten by this bug:
> > http://webcvs.freedesktop.org/gstreamer/gst-plugins-bad/gst/rtpmanager/gstrtpbin.c?view=log
> > it should work.
> >
> > Wim
> >
> >
>
> Hi Wim,
> are you talking about rev1.46:1.47 commits or something older ?

revision 1.45 contains an important fix for sync. It will not sync
properly if the first audio and video packets do not arrive in the
receiver at the same time.

Wim

>
>
> >> -------------------------------------------------------------------------
> >> This SF.net email is sponsored by: Microsoft
> >> Defy all challenges. Microsoft(R) Visual Studio 2008.
> >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> >> _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >>
> >
> >
> > -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Microsoft
> > Defy all challenges. Microsoft(R) Visual Studio 2008.
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> > [hidden email]
> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
> >
> >
>
>

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