feat(output): make ffmpeg loglevel configurable

Add --ffmpeg-loglevel so users can choose which ffmpeg messages are
shown during encoding instead of always using the built-in default.

Load the same setting from [output].ffmpeg_loglevel when it is
configured and no CLI value was provided.

Document the new option in the README and man page, and add shell
completion for supported ffmpeg log levels.

1 files changed, 15 insertions, 0 deletions

diff --git a/transcode.sh.1 b/transcode.sh.1
index 3867d1c..bc3639c 100644
--- a/transcode.sh.1
+++ b/transcode.sh.1
@@ -179,6 +179,14 @@ After encoding, replace the original also if the new file is bigger.
 Load the preset named \fINAME\fR from the preset directory. Defaults to
 .BR default .
 .TP
+.BR \-\-ffmpeg\-loglevel " \fILEVEL\fR, " \-\-ffmpeg\-loglevel= \fILEVEL\fR
+Pass
+\.BI \-v " LEVEL"
+to
+.BR ffmpeg(1).
+Defaults to
+.BR fatal .
+.TP
 .BR \-h ", " \-\-help ", " \-?
 Print a short help message and exit.
 .TP
@@ -425,6 +433,7 @@ Boolean. Equivalent to
 .B [size_report] file
 String. Equivalent to
 .BR \-\-size\-report\-file .
+.TP
 .B [output] verbose
 Boolean. Equivalent to
 .BR \-v .
@@ -432,6 +441,12 @@ Boolean. Equivalent to
 .B [output] quiet
 Boolean. Equivalent to
 .BR \-q .
+.TP
+.B [output] ffmpeg_loglevel
+String. Equivalent to
+.BR \-\-ffmpeg\-loglevel .
+Defaults to
+.BR fatal .
 .RE
 .TP
 .IR "${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/skip.conf"