evideomagic

This is erlang API wrapper for video processing utility libav. Client requests are accepted by one working process. When the process is busy with processing, pended requests forms queue in the server memory.

Dependencies

Open source audio and video processing tools: <https://libav.org/> 
installation on ubuntu :
    apt-get install libav-tools

Configuration

The following settings supported in the application 
    {workdir, "/tmp/evideomagic"} -- directory to store temporary files

API

evideomagic performs requests asynchronically. To receive result in calling client process the API methods include parameter process id. Message sent to client process is a record, according to command :

command               | API method    |  record definition

:--------------------------|:-------------:|:--------------------------------- creating video thumbnail | makeThumbnail | rd(make_thumbnail, {fnamein, fnameout, pid}).

Manual run.

make run
in erlang console:
1> application:start(evideomagic).
2> rd(make_thumbnail, {fnamein, fnameout, pid}).
3> Pid = spawn_link(fun() -> receive #make_thumbnail{fnameout=Tmp} -> io:format("Thumbnail file : ~p", [Tmp]), exit(normal) end end).
4> evideomagic:makeThumbnail("test/SampleVideo_1080x720_1mb.mp4", Pid).

Using in code.

-include_lib("evideomagic/include/evideomagic.hrl").
...

upload_video(Object, Type, File) ->
    ...
    evideomagic:makeThumbnail(Object:data(), self()),
    receive 
        #make_thumbnail{fnameout=ThumbFname} -> {ok, ThumbBin} = file:read_file(ThumbFname), 
                                            Thumb = base64:encode(ThumbBin)
    end,
    ...