FLV demuxing and decoding

[Darren Staples]

Hi again,

As an experiment I’ve been trying to get flash video (.flv) files to play in an x-window.
I can get a video-test signal to display using: “gst-launch-0.10 videotestsrc ! Ximagesink”, so I know the basic infra-structure is working :)

As for getting .flv files to play I’ve tried variations on: “gst-launch-0.10 filesrc location=file.flv ! flv_demux ! ffdec_flv ! ximagesink”.
But I keep getting an internal data stream error at the flvdemux element.

I have the base, bad and FFMPEG plugins installed.

Is this basic pipeline correct or am I doing something stupid ?

Thanks in advance !

Darren

 

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[Sudarshan Bisht]

Hi ,,

         Use gst-launch filesrc location=file.flv ! decodebin ! ffmpegcolorspace ! ximagesink , here decodebin automatically links the required plugins .

 

 

On Wed, Jan 7, 2009 at 4:36 PM, Darren Staples <[hidden email]> wrote:

Hi again,

As an experiment I've been trying to get flash video (.flv) files to play in an x-window.
I can get a video-test signal to display using: "gst-launch-0.10 videotestsrc ! Ximagesink", so I know the basic infra-structure is working :)

As for getting .flv files to play I've tried variations on: "gst-launch-0.10 filesrc location=file.flv ! flv_demux ! ffdec_flv ! ximagesink".
But I keep getting an internal data stream error at the flvdemux element.

I have the base, bad and FFMPEG plugins installed.

Is this basic pipeline correct or am I doing something stupid ?

Thanks in advance !

Darren

 

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--
Regards,

Sudarshan Bisht

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[Edward Hervey]

Maybe because the files you are trying don't contain FLV1 video but some
other codec ?

  replace flvdemux by decodebin2, it'll do all the magic for you

   Edward

On Wed, 2009-01-07 at 11:06 +0000, Darren Staples wrote:

> Hi again,
>
> As an experiment I’ve been trying to get flash video (.flv) files to
> play in an x-window.
> I can get a video-test signal to display using: “gst-launch-0.10
> videotestsrc ! Ximagesink”, so I know the basic infra-structure is
> working :)
>
> As for getting .flv files to play I’ve tried variations on:
> “gst-launch-0.10 filesrc location=file.flv ! flv_demux ! ffdec_flv !
> ximagesink”.
> But I keep getting an internal data stream error at the flvdemux
> element.
>
> I have the base, bad and FFMPEG plugins installed.
>
> Is this basic pipeline correct or am I doing something stupid ?
>
> Thanks in advance !
>
> Darren
>
>
>  
>
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[michael smith-6-3]

On Wed, Jan 7, 2009 at 3:06 AM, Darren Staples <[hidden email]> wrote:

> Hi again,
>
> As an experiment I've been trying to get flash video (.flv) files to play in
> an x-window.
> I can get a video-test signal to display using: "gst-launch-0.10
> videotestsrc ! Ximagesink", so I know the basic infra-structure is working
> :)
>
> As for getting .flv files to play I've tried variations on: "gst-launch-0.10
> filesrc location=file.flv ! flv_demux ! ffdec_flv ! ximagesink".
> But I keep getting an internal data stream error at the flvdemux element.

The suggestions from other people to use decodebin or decodebin2
rather than manually selecting demuxers/decoders are good - you should
do that.

That's not what's causing the problem here though. ximagesink can only
display RGB image data, and most (almost all) video decoders output
some form of YUV data. So, you need to either use a sink that can
directly handle YUV data (like xvimagesink - this is recommended if
you can use it), or you need to convert. The 'ffmpegcolorspace'
element can do this conversion.

For some videos, you'll also need 'videoscale' if you're using
ximagesink, because ximagesink can only display square pixels, and
some videos have non-square pixels.

Mike

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