Video mixing problems

[Josep Creus]

Hello there,

We are going to use Premier if I cannot solve this. I don't want it.
I'm trying to use videomixer, videoscale, videobox and ffdeinterlace to
compose a video beginning with tree streams.

This is the actual script, obviously the xvimagesink filter is
substituted by a codec compressor filter.

gst-launch-0.10 filesrc location="video1.mpg" \
{ ! decodebin2 ! ffdeinterlace ! queue2 ! videocrop left=6 right=8 top=2
bottom=6 ! videoscale method=2 ! video/x-raw-yuv, width=454, height=358
! videobox border-alpha=0 alpha=1 right=-266 top=-124 bottom=-94 !
ffmpegcolorspace ! videomixer name=mix ! xvimagesink } \
{ filesrc location="video2.mpg" ! decodebin2 ! ffdeinterlace ! queue2 !
videocrop left=6 right=8 top=2 bottom=6 ! videoscale method=2 !
video/x-raw-yuv, width=268, height=224 ! videobox border-alpha=0 alpha=1
left=-452 top=-138 bottom=-214 ! ffmpegcolorspace ! mix. } \
{ multifilesrc location="backgorund.png" num-buffers=102959 ! image/png,
framerate=25/1 ! pngdec ! queue2 ! ffmpegcolorspace ! mix. }

AFAIK, ffdeinterlace only works with I420 colorspace, videocrop,
videoscale and videobox has no problem working with it, but it seams
that there is no alpha channel, and that makes the chain unusable, only
the second video stream is visible with all black bars around. Any ideas
on how can I solve this? I've tried using alpha filter, but then the
chain is not prerolling at all, whichever method I choose.

Besides that, I don't see GStreamer using the format property at all,
how has it to be entered? In GStreamer 0.8 it was something like
format=/fourcc/

And videobox 0.10.16 is supposed to have the autocrop properties,
GStreamer web documentation says so, but it have not. To whom I have to
report this?

Oh! I almost forget it, I'm using Ubuntu 9.10.

Greetings and thanks in advance for any help.
Josep

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[Brandon Lewis]

On Tue, 2010-05-04 at 20:42 +0200, Josep Creus Portolés wrote:

> Hello there,
>
> We are going to use Premier if I cannot solve this. I don't want it.
> I'm trying to use videomixer, videoscale, videobox and ffdeinterlace to
> compose a video beginning with tree streams.
>
> This is the actual script, obviously the xvimagesink filter is
> substituted by a codec compressor filter.
>
> gst-launch-0.10 filesrc location="video1.mpg" \
> { ! decodebin2 ! ffdeinterlace ! queue2 ! videocrop left=6 right=8 top=2
> bottom=6 ! videoscale method=2 ! video/x-raw-yuv, width=454, height=358
> ! videobox border-alpha=0 alpha=1 right=-266 top=-124 bottom=-94 !
> ffmpegcolorspace ! videomixer name=mix ! xvimagesink } \
> { filesrc location="video2.mpg" ! decodebin2 ! ffdeinterlace ! queue2 !
> videocrop left=6 right=8 top=2 bottom=6 ! videoscale method=2 !
> video/x-raw-yuv, width=268, height=224 ! videobox border-alpha=0 alpha=1
> left=-452 top=-138 bottom=-214 ! ffmpegcolorspace ! mix. } \
> { multifilesrc location="backgorund.png" num-buffers=102959 ! image/png,
> framerate=25/1 ! pngdec ! queue2 ! ffmpegcolorspace ! mix. }
>
> AFAIK, ffdeinterlace only works with I420 colorspace, videocrop,
> videoscale and videobox has no problem working with it, but it seams
> that there is no alpha channel, and that makes the chain unusable, only
> the second video stream is visible with all black bars around. Any ideas
> on how can I solve this? I've tried using alpha filter, but then the
> chain is not prerolling at all, whichever method I choose.

videobox has border-alpha and alpha properties and will output AYUV or
ARGB if you tell it to. You may need to insert a caps filter between
videobox and videomixer. You should also look into the alpha and
alphacolor elements.

>
> Besides that, I don't see GStreamer using the format property at all,
> how has it to be entered? In GStreamer 0.8 it was something like
> format=/fourcc/
>
> And videobox 0.10.16 is supposed to have the autocrop properties,
> GStreamer web documentation says so, but it have not. To whom I have to
> report this?
>
> Oh! I almost forget it, I'm using Ubuntu 9.10.

This shipped with a fairly old gstreamer. See our developer's PPA for
more up-to-date packages.
>
> Greetings and thanks in advance for any help.
> Josep
>
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> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel



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