Mass importing dual audio channel sources

I’m trying to figure out how I can speed up my process and figured this would be the place to ask.

So I’ve got a large amount of files recorded through Shadowplay which are video files with dual audio. One audio is program/system sounds and the other is mic sounds. I need to edit each file’s mic sounds and leave the program/system sounds alone. How I’m doing this is importing one file, selecting “select stream(s) to import” as stream 2 and then applying a chain to apply effects and export. The problem is I have to do this individually and can’t just mass apply because if I try to import several at once it asks which stream for the first one, then imports and then after several minutes and that is done importing, it asks which stream for the next video and so on. This means I have to sit there and wait for each one to finish to keep selecting stream 2, which defeats the purpose of mass import. The same is the case if I have nothing imported and use the “apply chain to files” and select multiple. How can I get around this and auto select stream 2 each time?

I presume you intend to edit the videos, in which case it may be easier to get your videos into the video editor first, then export the audio from the video editor as a WAV file, then import the WAV file into Audacity for editing.

That would be much faster, but the problem is the program I’m editing with (adobe premiere) automatically pulls one channel of audio and doesn’t see the second channel at all, so the only way I can put the second audio channel into my editing program, is to export it in audacity first.

Perhaps the last post in this Adobe forum thread will help:

I think I should have put “stream” rather than “channel”, it isn’t left/right channel like stereo vs mono, it is separate audio sources. Like one stream is what is coming through my headphones and the second stream is from my mic.

It looks like it is possible to extract a specified stream from a file with the standalone FFmpeg application, using the “map” option:
As FFmpeg is a command-line program, it can be used in a batch script. There’s a tutorial about “Dos style” batch files here:

Another possible option may be to use HandBrake: