===== Custom FFmpeg Encoder =====
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==== Purpose ====
Customized encoding using FFMpeg.

==== How it works ====
It is very similar to using a commandline processor for calling ffmpeg but it automatically inserts everything up to "-i" and the output filename in the executed ffmpeg commandline. 

Usually we engineer ffmpeg commandline processing in a windows cmd.exe box. The final result of such an experiment leads for example to this commandline:
<code>C:\ffmpeg\ffmpeg.exe -i "C:\test\myfile.mp4" -codec copy -map 0 "C:\temp\myoutput.mp4"</code>

In order to automate this commandline, we could now use either a commandline processor in ffastrans, we just need to change it to something like this:
<code>"%s_ffmpeg%" -i "%s_source%" -codec copy -map 0 "%s_source%_transcoded.mp4"</code>

Also, if the job goes on with the transcoded file, in the commandline processor we would check the "set s_source" to: "%s_source%_transcoded.mp4"

Now, in a Custom ffmpeg processor, we would insert only this portion (and check that the codec text inputs are empty):
<code>-codec copy -map 0</code>

Custom ffmpeg processor would automatically insert before -codec: 
<code>"%s_ffmpeg%" -i "%s_source%"</code>

and after -map 0 it would insert some output filename that goes into the current working directory of the FFAStrans job. 
Also, it would automatically take care that the variable s_source is filled with the generated filename.
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==== Original Manual ====


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