gstreamer video playback , cannot play

[Ian Davidson]

There are sounds that we hear and things that we see. In order to be 
able to record these things, they need to be converted to some digital 
format -- and there are many choices for these. For example, a sound 
could be stored as a WAV file, a WMA file, an OGG file (and many more). 
The sound could have been recorded at 44100 samples per second (quite 
typical) or perhaps 1100 samples per second (very poor quality).

Many of the elements in a Gstreamer pipeline are used to manipulate the 
data from one format to another. A typical element will have a 'sink' 
(where you can 'pour in some data') and a 'src' (which will supply data 
to the next element in the sequence).

Obviously, the data will need to come from somewhere -- so if you are 
reading a file, you will have a 'filesrc' which will pick up the data 
from a file and pass it on to the next element; such an element will 
have a 'location' parameter to tell it where to find the file.

At the other end of the pipeline you will want to do something with this 
data you have been manipulating, so you will choose a 'sink' such as 
'alsasink' to play the sound.

In between, you will need to manipulate the data that you read from disk 
such that it can be played -- so if your input is a WAV file, you will 
need 'wavparse' to convert the data.

It may be that 'wavparse' is not always ready to accept data when your 
source wants to give it, so it is a good idea to include a 'queue' 
between elements to handle such problems.

I don't know exactly what you want to do. Go to 
http://gstreamer.freedesktop.org/documentation/ and follow the link to 
"Overview of all Plug-ins " to see what plug-ins are available. Many of 
the descriptions give an example of how you might use them.

Start by building a test pipeline using gst-launch. When you have got 
that working, then look to writing a program to replicate what you have 
tested using gst-launch.

On 12/03/2013 02:06, aero wrote:
>
> in brief my question is what are the elements required to play an audio and
> video. how to connect them.
> if elements depends on format of the flie (ogg,mp3,avi etc)  how to know
> what  to use for what type.
>
> i just want to get some basic idea of properties of elements before i do any
> programming.
>
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> --
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