[gst-devel] Amr Encoding

[Charles, Daniel]

Hello

The property approach was already proposed in a patch back when the band
mode was incorporated to the plug-in.

That time was decided that a single element (muxer like) would be the
best approach. Yet to be implemented

http://bugzilla.gnome.org/show_bug.cgi?id=466442

Thanks,

Daniel.

-----Original Message-----
From: gstreamer-devel-bounces at lists.sourceforge.net
[mailto:gstreamer-devel-bounces at lists.sourceforge.net] On Behalf Of
Benoit Fouet
Sent: Martes, 30 de Octubre de 2007 03:27 a.m.
To: Stefan Kost
Cc: Rahul Mittal; gstreamer-devel at lists.sourceforge.net
Subject: Re: [gst-devel] Amr Encoding

Hi,

Stefan Kost wrote:
> Hi,
>
> Benoit Fouet schrieb:
>   
>> Hi,
>>
>> Rahul Mittal wrote:
>>     
>>> Hi,
>>> I am trying out this pipeline to decode audio from a 3gp file and
Amr
>>> encode it..
>>> but the output file that i am getting is not a valid amr file
>>>
>>> gst-launch -v filesrc location=footsie.3gp ! decodebin !
audioconvert
>>> ! audioresample ! amrnbenc name=amrenc ! queue ! filesink location=
>>> exam.amr
>>>
>>> Does anybody has any idea what is wrong with this pipeline ???
>>>   
>>>       
>> i'd say it lacks an element to write the amr header... (and possibly,
>> you don't need the queue element)
>> have you tried adding "#!AMR\n" at the beginning of your file, to see
if
>> it becomes playable (with an hex editor) ?
>>
>>     
>
> yes, that should help. We do infact miss simple armnbformat and
amrwbformat
> elements that should be parts of amrnb amrwb plugins and do the
opposite of the
> parse elements.

it could be part of the encoder, no ?
setting a capability to tell it to write the header should be far more
simple
or even use the sink capabilities to decide whether or not to write the
AMR header.
something like the following should do it:

GST_STATIC_CAPS (
      "audio/x-amrnb-sh, "
      "rate = (int) 8000, "
      "channels = (int) 1;"
      "audio/AMR, "
      "rate = (int) 8000, "
      "channels = (int) 1"
      )

header would be added when caps are audio/x-amrnb-sh, and not if it's
audio/AMR

>  I would say they are an excellect oppurtunity for someone who
> would like to start contributing to gstreamer as they should not be
very hard to
> write. A starting point could a simple muxer like xingmux, id3mux,
id3v2mux or
> apemux.
>   

-- 
Ben
Purple Labs S.A.
www.purplelabs.com

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