[gst-devel] Compositing and GStreamer

[Kapil Agrawal]

Just a quick clue that might help, try using multifilesrc ?

On Thu, Nov 25, 2010 at 9:47 PM, Timothy Braun <braunsquared at gmail.com>wrote:

> Hello Everyone,
>   I'm fairly new to G-Streamer so any input you can provide is much
> appreciated.  I'm working on a project where we need to generate a 2 minute
> video which is a composite of a total of 24 input videos.  The output video
> will have 4 different 30 second sections, each containing a 3x2 grid of the
> smaller input videos.  The input videos are all naturally at 240x240 with
> the goal of having a final output frame size of 720x480.
>
>   Using gst-launch, I've been able to construct a sample 30 second clip
> using a combination of inputs, videoboxes and a videomixer.  Here is what
> I've come up with so far:
>
> videomixer name=mix ! ffmpegcolorspace ! ffenc_mpeg1video ! ffmux_mpeg
> name=mux ! queue ! filesink location=output.mpg
> adder name=adder ! audioconvert ! ffenc_mp2 ! mux.
> filesrc location=loop1.mp4 ! decodebin name=decode1
> decode1. ! videobox border-alpha=0 top=-240 left=0 ! queue ! mix.
> decode1. ! adder.
> filesrc location=loop2.mp4 ! decodebin name=decode2
> decode2. ! videobox border-alpha=0 top=-240 left=-240 ! queue ! mix.
> decode2. ! adder.
> filesrc location=loop3.mp4 ! decodebin name=decode3
> decode3. ! videobox border-alpha=0 top=-240 left=-480 ! queue ! mix.
> decode3. ! adder.
> filesrc location=loop4.mp4 ! decodebin name=decode4
> decode4. ! videobox border-alpha=0 top=0 left=0 ! queue ! mix.
> decode4. ! adder.
> filesrc location=loop5.mp4 ! decodebin name=decode5
> decode5. ! videobox border-alpha=0 top=0 left=-240 ! queue ! mix.
> decode5. ! adder.
> filesrc location=loop6.mp4 ! decodebin name=decode6
> decode6. ! videobox border-alpha=0 top=0 left=-480 ! queue ! mix.
> decode6. ! adder.
>
>   Now I need to do this 4 times, each time with a potentially different
> video in each box.  I've started looking into C interfaces as there's other
> pieces of the puzzle which need to be tied into this, and I am trying to
> determine the best way to tackle this.  I originally was looking at Gnonlin,
> but the documentation is lacking in regards to how gnloperations work.  I
> also recently stumbled upon the GES library by Edward Hervey, this looks
> promising as well, but I haven't been able to spend much time on it.
>
>   If I go the Gnonlin route, I believe I would need 6 compositions, one for
> each box.  At the 30 second marker, I would swap the filesource to a new one
> using dynamic pads and listening for messages on the pipeline bus.  Am I far
> off on this?  Any suggestions?
>
>   As for the GES library, it looks very promising and powerful from the
> little I read on it.  Would this be the smarter route to take?  If so, does
> anyone have any suggestions for how the pipeline would be structured?
>
>   Thank you in advance for your time on this and I truly appreciate any
> information you are willing to share with me.
>
>   Happy Thanksgiving,
>   Tim
>
>
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-- 
www.mediamagictechnologies.com (Gstreamer, ffmpeg, Red5, Streaming)
twitter handle: @gst_kaps
http://www.linkedin.com/in/kapilagrawal
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