ffmpeg -loglevel error [other commands]
This hides the banner and only displays errors. Use
-loglevel warning if you would like to see warnings.
Tested in Ffmpeg 3.0.2.
From the documentation:
-loglevel [repeat+]loglevel | -v [repeat+]loglevel
Set the logging level used by the library. Adding "repeat+" indicates
that repeated log output should not be compressed to the first line
and the "Last message repeated n times" line will be omitted. "repeat"
can also be used alone. If "repeat" is used alone, and with no prior
loglevel set, the default loglevel will be used. If multiple loglevel
parameters are given, using ’repeat’ will not change the loglevel.
loglevel is a string or a number containing one of the
Show nothing at all; be silent.
Only show fatal errors which could lead the process to crash, such as
and assert failure. This is not currently used for anything.
Only show fatal errors. These are errors after which the process
absolutely cannot continue after.
Show all errors, including ones which can be recovered from.
Show all warnings and errors. Any message related to possibly
incorrect or unexpected events will be shown.
Show informative messages during processing. This is in addition to
warnings and errors. This is the default value.
info, except more verbose.
Show everything, including debugging information.
By default the program logs to stderr, if coloring is supported by the
terminal, colors are used to mark errors and warnings. Log coloring
can be disabled setting the environment variable
NO_COLOR, or can be forced setting the
AV_LOG_FORCE_COLOR. The use of the environment
NO_COLOR is deprecated and will be dropped in a following