[FFmpeg-user] Detecting errors

[Murthy avsn]

Hi all,
I am calling 'ffmpeg' from PHP to encode a video.here id how I am calling. exec(''ffmpeg -i inputfile outputfile 2>result.log");
I am trying to redirect stderr to a text file.ProblemI was expecting only errors to be written to log file but the entire console output is being written to file.Is there a way to only display error with ffmpeg.How can I find a encoding failure by looking at the console out put.
Please help me.

Thank you,
Thanks a lot for your support.