Le sextidi 6 thermidor, an CCXXI, satya gowtham kudupudi a écrit : > I am making system call to above command and i want to extract only error > message but unfortunately ffmpeg is writing non error messages to stderr.
Well, errors are *supposed* to go to stderr, it means "standard *error* stream", after all; other diagnostics messages belong there as well. ffmpeg can produce actual output to stdout, for further processing in a pipeline, you would not want a Matroska stream mixed with error messages. Redirecting stderr to stdout is pretty easy from the calling shell. Regards, -- Nicolas George
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