VLC HowTo/Make a mosaic

2006-06-05T05:52:48Z

1149486730:

==VLC mosaic howto==

This is a small example about how to use VLC to create a mosaic. What we basically want is a video mosaic mixing 3 video channels (channels 1, 2 and 3) on a background image (background.png) and streaming the resulting video on the network. Note that we will also be streaming the 3 sound tracks from channels 1, 2 and 3 in the same mpeg-ts stream.

Starting with VLC 0.8.5-test2, the http interface features a "Mosaic wizard". You might want to use it if you have no knowledge of VLC command line usage.

http://people.via.ecp.fr/~dionoea/videolan/mosaic1.png

Other neat examples :

[http://people.via.ecp.fr/~dionoea/videolan/mosaic2.jpg 12 video mosaic]

[http://people.via.ecp.fr/~dionoea/videolan/mos1.png 20 video mosaic]

[http://people.via.ecp.fr/~dionoea/videolan/mos2.png 20 video mosaic]

===Step 0===

Read the VLC streaming howto (chapters 3 and 5 concerning command line and vlm usage in VLC) : http://videolan.org/doc/

===Step 1===

Get [[VLC]] 0.8.4-test1 or newer and install it on your computer.

===Step 2===

You now have to get a background image. Many image formats are supported (JPEG, PNG ...).

You can also test it with VLC to see if it displays locally :
<pre>
./vlc --fake-file background.png --fake-aspect-ratio "4:3" fake:
</pre>

===Step 3===

You now need to configure VLC to get the 3 source streams and blend them on the background image.

The vlm configuration file looks like :

<pre>
new channel1 broadcast enabled
setup channel1 input udp://@239.255.2.60:1234
setup channel1 output #duplicate{dst=mosaic-bridge{id=1,height=144,width=180},select=video,dst=bridge-out{id=1},select=audio}

new channel2 broadcast enabled
setup channel2 input udp://@239.255.10.200:1234
setup channel2 output #duplicate{dst=mosaic-bridge{id=2,height=144,width=180},select=video,dst=bridge-out{id=2},select=audio}

new channel3 broadcast enabled
setup channel3 input udp://@239.255.6.9:1234
setup channel3 output #duplicate{dst=mosaic-bridge{id=3,height=144,width=180},select=video,dst=bridge-out{id=3},select=audio}

new background broadcast enabled
setup background input fake:
setup background output #transcode{sfilter=mosaic,vcodec=mp2v,vb=10000,scale=1}:bridge-in{delay=400,id-offset=100}:standard{access=udp,mux=ts,url=239.255.12.42,sap,name="mosaic"}

control background play
control channel1 play
control channel2 play
control channel3 play
</pre>

Note that the source streams are network streams, which is likely to be the case if you're considering doing a mosaic.

===Step 4===

And now, the right command to launch vlc :

<pre>
./vlc --color -I telnet --vlm-conf ../mosaic.vlm.conf --ttl 12 \
--fake-file background.png --fake-aspect-ratio "4:3" \
--mosaic-width 360 --mosaic-height 288 --udp-caching 800 \
--mosaic-keep-picture --mosaic-rows 2 --mosaic-cols 2 \
--mosaic-position 1 --mosaic-order 1,2,3
</pre>

===Small Diagram That Might Help===
[http://people.via.ecp.fr/~dionoea/videolan/mosaic-diagram.png Small Diagram That Might Help]

==Appendix==

===Mosaic video sub filter===
The full set of mosaic commands is :

<pre>
Mosaic video sub filter
--mosaic-alpha <integer> Alpha blending
Alpha blending (0 -> 255). Default is 255
--mosaic-height <integer> Height in pixels
Height in pixels
--mosaic-width <integer> Width in pixels
Width in pixels
--mosaic-align {0 (Center), 1 (Left), 2 (Right), 4 (Top), 8 (Bottom), 5 (Top-Left), 6 (Top-Right), 9 (Bottom-Left), 10 (Bottom-Right)}
Mosaic alignment
Mosaic alignment
--mosaic-xoffset <integer> Top left corner x coordinate
Top left corner x coordinate
--mosaic-yoffset <integer> Top left corner y coordinate
Top left corner y coordinate
--mosaic-vborder <integer> Vertical border width in pixels
Vertical border width in pixels
--mosaic-hborder <integer> Horizontal border width in pixels
Horizontal border width in pixels
--mosaic-position {0 (auto), 1 (fixed)}
Positioning method
Positioning method. auto : automatically
choose the best number of rows and columns.
fixed : use the user-defined number of rows
and columns.
--mosaic-rows <integer> Number of rows
Number of rows
--mosaic-cols <integer> Number of columns
Number of columns
--mosaic-keep-aspect-ratio, --no-mosaic-keep-aspect-ratio
Keep aspect ratio when resizing (default
disabled)
Keep aspect ratio when resizing (default
disabled)
--mosaic-keep-picture, --no-mosaic-keep-picture
Keep original size (default disabled)
Keep original size (default disabled)
--mosaic-order <string> Order as a comma separated list of
picture-id(s)
Order as a comma separated list of
picture-id(s)
--mosaic-delay <integer> Delay
Pictures coming from the picture video
outputs will be delayed accordingly (in
milliseconds). For high values you will need
to raise file-caching and others.
</pre>

===Mosaic bridge stream output===
The full set of mosaic bridge stream output commands is :

<pre>
Mosaic bridge stream output
--sout-mosaic-bridge-id <string>
ID
Specify an identifier string for this
subpicture
--sout-mosaic-bridge-width <integer>
Video width
Allows you to specify the output video width.
--sout-mosaic-bridge-height <integer>
Video height
Allows you to specify the output video height.
</pre>

===Bridge stream output===
The full set of bridge stream output commands is :

<pre>
Bridge stream output
--sout-bridge-out-id <integer>
ID
Specify an identifier integer for this
elementary stream
--sout-bridge-in-delay <integer>
Delay
Pictures coming from the picture video
outputs will be delayed accordingly (in
milliseconds, >= 100 ms). For high values you
will need to raise file-caching and others.
--sout-bridge-in-id-offset <integer>
ID Offset
Offset to add to the stream IDs specified in
bridge_out to obtain the stream IDs bridge_in
will register.
</pre>

===Fake input module===
The full set of the fake input options is :
<pre>
Fake video decoder
--fake-file <string> Image file
Path of the image file when using the fake
input.
--fake-width <integer> Video width
Allows you to specify the output video width.
--fake-height <integer> Video height
Allows you to specify the output video height.
--fake-keep-ar, --no-fake-keep-ar
Keep aspect ratio (default disabled)
If selected, width and height will be
considered as maximum values. (default
disabled)
--fake-aspect-ratio <string>
Background aspect ratio
Aspect ratio of the image file (4:3, 16:9).
Default is square pixels.
--fake-deinterlace, --no-fake-deinterlace
Deinterlace video (default disabled)
Allows you to deinterlace the image after
loading. (default disabled)
--fake-deinterlace-module {deinterlace,ffmpeg-deinterlace}
Deinterlace module
Specifies the deinterlace module to use.
</pre>

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VLC HowTo/Make a mosaic