What are the types of the parameters that can be passed to gst_init ?

[NinjaGod]

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[Tim-Philipp Müller-2]

On Sun, 2010-12-26 at 10:10 -0800, Anirudh wrote:

> I am a newbie in the field of Gstreamer and I have just started reading the
> official manual for application developers and its damn! interesting.
>
> I encountered that gst_init() function is used to initialize the Gstreamer.
> (fine)
> but I do not know what kind of parameters can be passed to it.
>
> They have given an example where they use it like : gst_init(&argc,&argv)
> but its not given what are the values/can be the possible values of argc and
> argv. (that I should pass)

The options from 'gst-inspect-0.10 --help-gst' basically, ie.:

GStreamer Options
  --gst-version                        Print the GStreamer version
  --gst-fatal-warnings                 Make all warnings fatal
  --gst-debug-help                     Print available debug categories
and exit
  --gst-debug-level=LEVEL              Default debug level from 1 (only
error) to 5 (anything) or 0 for no output
  --gst-debug=LIST                     Comma-separated list of
category_name:level pairs to set specific levels for the individual
categories. Example: GST_AUTOPLUG:5,GST_ELEMENT_*:3
  --gst-debug-no-color                 Disable colored debugging output
  --gst-debug-disable                  Disable debugging
  --gst-plugin-spew                    Enable verbose plugin loading
diagnostics
  --gst-plugin-path=PATHS              Colon-separated paths containing
plugins
  --gst-plugin-load=PLUGINS            Comma-separated list of plugins
to preload in addition to the list stored in environment variable
GST_PLUGIN_PATH
  --gst-disable-segtrap                Disable trapping of segmentation
faults during plugin loading
  --gst-disable-registry-update        Disable updating the registry
  --gst-disable-registry-fork          Disable spawning a helper process
while scanning the registry

However, the idea is basically that you just pass in the command line
arguments a passed by the user. If you want to enable/disable any of
these things from your program, you should just use the corresponding
GStreamer API to enable/disable it (where available).

Cheers
 -Tim



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[NinjaGod]

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[Tim-Philipp Müller-2]

On Sun, 2010-12-26 at 10:37 -0800, Anirudh wrote:

> but I wanted to know what should I pass...Gstreamer manual says that u
>  can pass NULL as a parameter as well. So what are consequences of  
>  passing NULL. gst_init(NULL,NULL);

What do you think the consequences of that are?

Simply that you can't set extra options via command line arguments.

> Suppose I don't want to pass the parameters from command line then it would
> be something like
> gst_init(param1,param2);
>
> then what should be param1 and param2...can anyone give an example for
> clarifying this doubt.
>
> something like ./a.out xyz pqr
> yeah! some value...but what should be the XYZ or PQR & what will be its
> consequences after gst_init(&argc,&argv) uses them to initialize Gstreamer

There's nothing particularly GStreamer-specific here, it's just an
extension of how main() works in C, or how gtk_init() works. The reason
the addresses of argv/argc are passed is so that arguments that have
been handled by GStreamer can be removed.

It's quite easy to play around with this a bit in code to see how it
works.

 Cheers
  -Tim



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[Timothy Braun]

I would suggest looking at the application developers guide on the gstreamer website. It covers all of this with code examples.

You don't have to be concerned with overlapping arguments since all of the gstreamer library args begin with '--gst-' and I don't believe they have a short form.

Best,
Tim

Sent from my iPhone

On Dec 26, 2010, at 2:02 PM, Tim-Philipp Müller <[hidden email]> wrote:

> On Sun, 2010-12-26 at 10:37 -0800, Anirudh wrote:
>
>> but I wanted to know what should I pass...Gstreamer manual says that u
>> can pass NULL as a parameter as well. So what are consequences of  
>> passing NULL. gst_init(NULL,NULL);
>
> What do you think the consequences of that are?
>
> Simply that you can't set extra options via command line arguments.
>
>
>> Suppose I don't want to pass the parameters from command line then it would
>> be something like
>> gst_init(param1,param2);
>>
>> then what should be param1 and param2...can anyone give an example for
>> clarifying this doubt.
>>
>> something like ./a.out xyz pqr
>> yeah! some value...but what should be the XYZ or PQR & what will be its
>> consequences after gst_init(&argc,&argv) uses them to initialize Gstreamer
>
> There's nothing particularly GStreamer-specific here, it's just an
> extension of how main() works in C, or how gtk_init() works. The reason
> the addresses of argv/argc are passed is so that arguments that have
> been handled by GStreamer can be removed.
>
> It's quite easy to play around with this a bit in code to see how it
> works.
>
> Cheers
>  -Tim
>
>
>
> ------------------------------------------------------------------------------
> Learn how Oracle Real Application Clusters (RAC) One Node allows customers
> to consolidate database storage, standardize their database environment, and,
> should the need arise, upgrade to a full multi-node Oracle RAC database
> without downtime or disruption
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> _______________________________________________
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> [hidden email]
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