[FFmpeg-user] Separate logging/STDERR/STDOUT for 2+ output files.

[Roger Pack]

> I want to encode  file1 and  file2 from the same source (huge lossless
> video file):
>
> `./ffmpeg -i 350GB_source.mov preset_X X.mp4 preset_Y Y.mp4`
>
> I want to monitor stdout and stderr for X.mp4 and Y.mp4 separately if
> possible.

Is it too expensive to just use 2 processes?
Anyway, my original suggestion is to use a "tee" to have it input from
one ffmpeg, then output to stdout, then split to the 2 (separate)
ffmpeg encode processes, ref:
http://ffmpeg.org/trac/ffmpeg/wiki/Creating%20multiple%20outputs