Audio playback not sync with video playback

[ericcardmanNo3]

playing avi (mpeg4/mp3) files result in a bit faster video playback than audio playback.
does anyone know such problem? how to solve it?

i do:

gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux demux.audio
_00 ! mad ! volume volume=0.5 ! alsasink  demux.video_00 ! queue ! video
/mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink

if i do:

gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux demux.audio
_00 ! queue ! mad ! volume volume=0.5 ! alsasink  demux.video_00 ! queue ! video
/mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink

audio is more behind video than in first pipeline.

the mympeg4dec decodes frames in hardware.

thx.

[Rodney Dowdall]

Hello Eric

I think you need to set sync=true on the video and audio syncs, so try:

gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux demux.audio_00 ! queue ! mad ! volume volume=0.5 ! alsasink sink=true  demux.video_00 ! queue ! video mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink sync=true

I think that should work.

Rodney

On 10-06-16 05:13 AM, ericcardmanNo3 wrote:

playing avi (mpeg4/mp3) files result in a bit faster video playback than
audio playback. 
does anyone know such problem? how to solve it?

i do:

gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux
demux.audio
_00 ! mad ! volume volume=0.5 ! alsasink  demux.video_00 ! queue ! video
/mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink

if i do:

gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux
demux.audio
_00 ! queue ! mad ! volume volume=0.5 ! alsasink  demux.video_00 ! queue !
video
/mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink

audio is more behind video than in first pipeline.

the mympeg4dec decodes frames in hardware.

thx.

  

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[michael smith-6-3]

On Wed, Jun 16, 2010 at 2:13 AM, ericcardmanNo3 <[hidden email]> wrote:

>
> playing avi (mpeg4/mp3) files result in a bit faster video playback than
> audio playback.
> does anyone know such problem? how to solve it?
>
> i do:
>
> gst-launch filesrc location=/home/out_CR.avi ! avidemux name=demux
> demux.audio
> _00 ! mad ! volume volume=0.5 ! alsasink  demux.video_00 ! queue ! video
> /mpeg,scalewidth=512,scaleheight=288 ! mympeg4dec ! ximagesink

GStreamer handles synchronising the audio and video for you,
automatically - you don't need to do anything special.

However, in order to do this, it needs correct timestamps on the
buffers - since you're using a private element here ("mympeg4dec"), my
guess would be that you have a bug in there, and that you're putting
incorrect (or no) timestamps on the buffers being pushed out.

It should work correctly once you put correct timestamps on your buffers.

Mike

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