Audio and video synchronisation

Andreas Rödig a.roedig at null821.de
Tue Oct 11 06:10:38 PDT 2011


Hi

yes this pipeline is working. But what i want is a queue2 after filesrc. 
I need some harddisk buffer. It works (video is starting with a 2 
seconds delay), but video and audio are not in synchron.

Try this with any mov file:
gst-launch filesrc location=/home/roedig/Videos/StarTrek.mov ! queue2 ! 
typefind ! qtdemux name=demux demux.video_00 ! queue ! fluvadec ! 
fluvasink demux.audio_00 ! fluaacdec ! queue ! pulsesink

The only differenc between my cmd pipeline and the playbin2 pipeline is 
the multiqueue. Please see my attachment....

Thanks,
Andreas


Am 11.10.2011 14:39, schrieb hcpwll:
> So, Do you means that playbin2 create the same demux,decoder,sink as you used in gst-launch?
> And Can you try the following cmd.
>
> gst-launch filesrc location=/home/roedig/Videos/StarTrek.mov ! qtdemux name=demux demux.video_00 ! queue ! fluvadec !
> fluvasink demux.audio_00 ! queue  !  fluaacdec ! pulsesink
>
> Maybe,  sent the bitstream StarTrek.mov to me, and I try it base on my platfrom.
>
> At 2011-10-11 15:05:13,"Andreas Rödig"<a.roedig at null821.de>  wrote:
>> Hi,
>>
>> i have checked playbin2 pipeline. And this is the result:
>>
>> gst-launch filesrc location=/home/roedig/Videos/StarTrek.mov ! typefind
>> ! qtdemux name=demux demux.video_00 ! fluvadec ! fluvasink
>> demux.audio_00 ! fluaacdec ! queue ! pulsesink
>>
>> It works and it is synchron. But i need some harddisk buffer like this
>> (with queue2 after filesrc):
>>
>> gst-launch filesrc location=/home/roedig/Videos/StarTrek.mov ! queue2 !
>> typefind ! qtdemux name=demux demux.video_00 ! fluvadec ! fluvasink
>> demux.audio_00 ! fluaacdec ! queue ! pulsesink
>>
>> Then i see video but i can hear audio only the first one or two seconds.
>> Then i try this (with queue after demux.video_00):
>>
>> gst-launch filesrc location=/home/roedig/Videos/StarTrek.mov ! queue2 !
>> typefind ! qtdemux name=demux demux.video_00 ! queue ! fluvadec !
>> fluvasink demux.audio_00 ! fluaacdec ! queue ! pulsesink
>>
>> Now i can hear sound and see video. But video starts after sound with a
>> delay at 2 seconds.
>>
>> Andreas
>>
>>
>> Am 11.10.2011 07:01, schrieb hcpwll:
>>> Hi,
>>>        Do you have check the elements create by playbin2?
>>>        Maybe playbin2 use diffrent demux, decode or sink element.
>>>
>>> At 2011-10-10 21:25:45,"Andreas Rödig"<a.roedig at null821.de>   wrote:
>>>> Hi,
>>>>
>>>> yes, playbin2 works fine. I think there is something wrong with my queue
>>>> in my pipeline. But i don't find some options to sync data streams in
>>>> pipeline.
>>>>
>>>>
>>>> best Regards,
>>>> Andreas
>>>>
>>>> Am 10.10.2011 15:09, schrieb Icarus Alive:
>>>>> On Mon, Oct 10, 2011 at 12:16 PM, Andreas Rödig<a.roedig at null821.de>    wrote:
>>>>>> Hi,
>>>>>>
>>>>>> i try to build my own pipeline (without playbin2).
>>>>>>
>>>>>> Thats what i have at the moment:
>>>>>>file:///home/roedig/Bilder/out.png

>>>>>> gst-launch filesrc location=movie.mov ! queue2 ! qtdemux name=demux
>>>>>> demux.video_00 ! queue ! fluvadec ! fluvasink demux.audio_00 ! queue !
>>>>>> fluaacdec ! autoaudiosink
>>>>>>
>>>>>> My Problem:
>>>>>> The Audio is starting directly. But video starts with a 2 seconds delay. And
>>>>>> than audio and video are not synchron.
>>>>>>
>>>>>> What i have to do for synchron video and audio?
>>>>>
>>>>> try to print debug traces with playbin2 and figure out it's pipeline.
>>>>> i hope the sync issue isn't seen with playbin2 ?
>>>>> in my case, a streaming asf source plays pretty well (no observable
>>>>> sync issues), but in my "optimized" pipeline, which was built by
>>>>> observing playbin2, doesn't fare so well. I think in my optimization
>>>>> drive, I've chopped off some necessary "sync" elements. recreating the
>>>>> playbin2 pipeline using discrete elements on command-line, completely,
>>>>> has been a challenge.
>>>>>
>>>>> i hope someone can shed some more light on this subject.
>>>>> _______________________________________________
>>>>> gstreamer-devel mailing list
>>>>> gstreamer-devel at lists.freedesktop.org
>>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>> --
>>>> Andreas Rödig
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> gstreamer-devel at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
>>>>
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> gstreamer-devel at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
-------------- next part --------------
A non-text attachment was scrubbed...
Name: out.png
Type: image/png
Size: 332857 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20111011/ef7510ee/attachment-0001.png>


More information about the gstreamer-devel mailing list