Unable to add -safe 0 argument before input

[dsvensson]

Related to #199, when using absolute paths you need -safe 0 before -f concat which is not possible today.

[Euklios]

This should be possible now, thanks to #339.
I'm not sure however, how exactly the "-safe" option is applied.

The code:

new FFmpegBuilder()
            .addExtraArgs("-safe", "0")
            .addInput("in.mp4")
            .setFormat("concat")
            .done()
            .addOutput("out.mp4")
            .done()
            .build()

would produce the command ffmpeg -y -v error -safe 0 -f concat -i in.mp4 out.mp4.
However, -safe is treated as an argument for the entire ffmpeg execution.

The code:

new FFmpegBuilder()
            .addInput("in.mp4")
            .addExtraArgs("-safe", "0")
            .setFormat("concat")
            .done()
            .addOutput("out.mp4")
            .done()
            .build()

Would produce ffmpeg -y -v error -f concat -safe 0 -i in.mp4 out.mp4.

I hope this solves the problem you described here.
If not, please re-open and provide me with a command demonstrating what you'd like to build.
If possible, use two inputs, as this would make the usage of -safe much more clearer.