[Gstreamer-openmax] Gstreamer Openmax plugins and Media demuxers

[Stefan Kost]

hi,

there parser uses GST_READ_* macros and they are not alignment save. 
There is some discussion ongoing to make the alignment save to ease 
portability.
http://bugzilla.gnome.org/show_bug.cgi?id=545714

Stefan

gulshan karmani schrieb:
> Hi All,
>
>       I have some questions regarding Gstreamer Based Demuxers used
> inside poky for media playback,
>
> 1. While using  'avidemux'  as a demuxer plugin we get continuous
> 'Alignment Traps'
> which is affecting the audio quality. We have a cmdline option to tell
> the kernel to fix these traps and suppress the warning but this could
> be just a workaround.
>
> Is this alignment trap caused by demuxer ? Or we need to take care of something
> in lower layers ?
> Instead of avidemux if we use 'ffdemux_avi' we do not get these traps.
>
> [We use Gst-omx decoders below which are calling ffmpeg for decoding,
> ffmpeg has been hardware accelerated].
>
> 2. Which are the Stand-alone Aac and mp3 demuxers inside Gstreamer to be used ?
>
> We are trying to use ffdemux_mp3 for mp3 and getting some package
> building issues.
>
> While for Aac we tried gst faad but this is being identified as Aac
> decoder along with parser. Could we not use this plugin just as a
> demuxer ?
>
> Following chains are working for AAC :
> "gst-launch filesrc
> location=/media/sdmmc0p1/streams/bass47_1_ADTS_LTP.aac ! faad !
> alsasink"
>
> "gst-launch omx_filereadersrc
> file-name=/media/sdmmc0p1/streams/AAC_TestStreams/al09_44.aac !
> omx_aacdec ! omx_audiosink"
>
> While the ones which we want to use and not working are :
> "gst-launch filesrc
> location=/media/sdmmc0p1/streams/bass47_1_ADTS_LTP.aac ! omx_aacdec !
> alsasink"
>
> "gst-launch omx_filereadersrc
> file-name=/media/sdmmc0p1/streams/AAC_TestStreams/al09_44.aac !
> omx_aacdec ! alsasink"
>
>
> Thanks for any quick suggestions in this regard.
>
> Best Regards,
>
> Gulshan Karmani
>
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