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.

4 files changed, 66 insertions, 1 deletions

diff --git a/README.md b/README.md
index f6bbe7b..720e0d5 100644
--- a/README.md
+++ b/README.md
@@ -178,6 +178,7 @@ quiet   = false
 | `[encoding]` | `verify_output` | boolean | `--verify-output` |
 | `[output]` | `quiet` | boolean | `-q` |
 | `[output]` | `verbose` | boolean | `-v` |
+| `[output]` | `ffmpeg_loglevel` | string | `--ffmpeg-loglevel` |
 | `[size_report]` | `enabled` | boolean | `-s` / `--no-size-report` |
 | `[size_report]` | `file` | string | `--size-report-file` |
 | `[skip]` | `codecs` | array of strings | `-S` / `--skip-codec-override` |
@@ -227,6 +228,7 @@ transcode.sh [OPTION] [--] FILE...
 | `-l`, `--only-if-smaller` | Only replace original if new file is smaller |
 | `--no-only-if-smaller` | Do replace original even if new file is bigger |
 | `-p NAME`, `--preset NAME`, `--preset=NAME` | Preset to use (default: `default`) |
+| `--ffmpeg-loglevel LEVEL`, `--ffmpeg-loglevel=LEVEL` | Specify the loglevel to pass to ffmpeg (default: `fatal`) |
 | `-q`, `--quiet` | Suppress all output (overrides `-v`) |
 | `-v`, `--verbose` | More detailed output |
 | `--color` / `--no-color` | Force or disable colored output |
diff --git a/transcode.sh b/transcode.sh
index 3e46b0e..093db93 100755
--- a/transcode.sh
+++ b/transcode.sh
@@ -155,6 +155,7 @@ BACKUP_DIR=""
 CONTINUE_ON_FAIL=0
 DRY_RUN=0
 ENCODE_FILE=""
+FFMPEG_LOGLEVEL="fatal"
 HWACCEL=1
 HWACCEL_VALUE="auto"
 NICE_VALUE=19
@@ -179,6 +180,7 @@ readonly SKIP_CODECS_FILE="${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/skip.c
 _CLI_BACKUP_DIR=0
 _CLI_CONFIG_FILE=0
 _CLI_CONTINUE=0
+_CLI_FFMPEG_LOGLEVEL=0
 _CLI_HWACCEL=0
 _CLI_NICE=0
 _CLI_ONLY_IF_SMALLER=0
@@ -310,6 +312,7 @@ ${BOLD}${BLUE}Size report options:${ALL_OFF}
       ${BOLD}${YELLOW}--size-report-file${ALL_OFF} ${BOLD}${GREEN}FILE${ALL_OFF}   path for the size report log (default: ${BOLD}${RED}%s${ALL_OFF})
 
 ${BOLD}${BLUE}Output options:${ALL_OFF}
+      ${BOLD}${YELLOW}--ffmpeg-loglevel${ALL_OFF}         specify the loglevel to pass to ffmpeg (default: ${BOLD}${RED}fatal${ALL_OFF})
   ${BOLD}${YELLOW}-q, --quiet${ALL_OFF}                   suppress all output; takes precedence over ${BOLD}${YELLOW}-v${ALL_OFF}
   ${BOLD}${YELLOW}-v, --verbose${ALL_OFF}                 explain what is being done
       ${BOLD}${YELLOW}--color${ALL_OFF}                   force colored output
@@ -656,6 +659,16 @@ load_config() {
       fi
     fi
   fi
+
+  # [output] ffmpeg_loglevel
+  if [[ $_CLI_FFMPEG_LOGLEVEL -eq 0 ]]; then
+    val=$(_tomlq_get '.output.ffmpeg_loglevel // empty')
+    if [[ -n "$val" ]]; then
+      debug "Config: output.ffmpeg_loglevel =" "$val"
+      FFMPEG_LOGLEVEL="$val"
+    fi
+  fi
+
 }
 
 ###############################################################################
@@ -1237,7 +1250,7 @@ encode_one() {
     -nostdin
     -y
     -hide_banner
-    -v error
+    -v "$FFMPEG_LOGLEVEL"
     -stats
     "${hwaccel_args[@]}"
     -i "file:$input_file"
@@ -1628,6 +1641,28 @@ while [[ $# -gt 0 ]]; do
     _CLI_PRESET=1
     shift
     ;;
+  --ffmpeg-loglevel)
+    if [[ $# -lt 2 ]]; then
+      error "Missing value for:" "$1"
+      exit $EXIT_USAGE_ERROR
+    fi
+    if [[ ! -n "$2" ]]; then
+      error "Value for $1 must not be empty"
+      exit $EXIT_USAGE_ERROR
+    fi
+    FFMPEG_LOGLEVEL="$2"
+    _CLI_FFMPEG_LOGLEVEL=1
+    shift 2
+    ;;
+  --ffmpeg-loglevel=*)
+    if [[ ! -n "${1#*=}" ]]; then
+      error "Value for --ffmpeg-loglevel must not be empty"
+      exit $EXIT_USAGE_ERROR
+    fi
+    FFMPEG_LOGLEVEL="${1#*=}"
+    _CLI_FFMPEG_LOGLEVEL=1
+    shift
+    ;;
   --)
     shift
     REMAINING_ARGS+=("$@")
@@ -1663,6 +1698,7 @@ debug "  backup-dir:" "$BACKUP_DIR"
 debug "  config-file:" "$CONFIG_FILE"
 debug "  dry-run:" "$DRY_RUN"
 debug "  encode-file:" "$ENCODE_FILE"
+debug "  ffmpeg-loglevel:" "$FFMPEG_LOGLEVEL"
 debug "  hwaccel:" "$HWACCEL"
 debug "  hwaccel_value:" "$HWACCEL_VALUE"
 debug "  nice:" "$NICE_VALUE"
diff --git a/transcode.sh.1 b/transcode.sh.1
index 3867d1c..bc3639c 100644
--- a/transcode.sh.1
+++ b/transcode.sh.1
@@ -179,6 +179,14 @@ After encoding, replace the original also if the new file is bigger.
 Load the preset named \fINAME\fR from the preset directory. Defaults to
 .BR default .
 .TP
+.BR \-\-ffmpeg\-loglevel " \fILEVEL\fR, " \-\-ffmpeg\-loglevel= \fILEVEL\fR
+Pass
+\.BI \-v " LEVEL"
+to
+.BR ffmpeg(1).
+Defaults to
+.BR fatal .
+.TP
 .BR \-h ", " \-\-help ", " \-?
 Print a short help message and exit.
 .TP
@@ -425,6 +433,7 @@ Boolean. Equivalent to
 .B [size_report] file
 String. Equivalent to
 .BR \-\-size\-report\-file .
+.TP
 .B [output] verbose
 Boolean. Equivalent to
 .BR \-v .
@@ -432,6 +441,12 @@ Boolean. Equivalent to
 .B [output] quiet
 Boolean. Equivalent to
 .BR \-q .
+.TP
+.B [output] ffmpeg_loglevel
+String. Equivalent to
+.BR \-\-ffmpeg\-loglevel .
+Defaults to
+.BR fatal .
 .RE
 .TP
 .IR "${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/skip.conf"
diff --git a/transcode.sh.bash-completion b/transcode.sh.bash-completion
index ea3bf74..160eb6f 100644
--- a/transcode.sh.bash-completion
+++ b/transcode.sh.bash-completion
@@ -38,6 +38,7 @@ _transcode_sh() {
   local codecs='h264 hevc av1 vp8 vp9 mpeg2video mpeg4 mjpeg theora'
   local nice_vals='0 5 10 15 19'
   local hwaccel_methods='auto cuda vaapi dxva2 d3d11va videotoolbox qsv'
+  local ffmpeg_loglevels='quiet panic fatal error warning info verbose debug trace'
 
   # ---------------------------------------------------------------------------
   # Handle --option=VALUE: cur contains the entire "--opt=val" token.
@@ -85,6 +86,11 @@ _transcode_sh() {
     COMPREPLY=($(compgen -W "$hwaccel_methods" -- "$cur"))
     return
     ;;
+  --ffmpeg-loglevel=*)
+    cur="${cur#*=}"
+    COMPREPLY=($(compgen -W "$ffmpeg_loglevels" -- "$cur"))
+    return
+    ;;
   esac
 
   # ---------------------------------------------------------------------------
@@ -125,6 +131,10 @@ _transcode_sh() {
     COMPREPLY=($(compgen -W "$hwaccel_methods" -- "$cur"))
     return
     ;;
+  --ffmpeg-loglevel)
+    COMPREPLY=($(compgen -W "$ffmpeg_loglevels" -- "$cur"))
+    return
+    ;;
   esac
 
   # ---------------------------------------------------------------------------
@@ -146,6 +156,8 @@ _transcode_sh() {
       --dry-run
       --encode-file
       --encode-file=
+      --ffmpeg-loglevel
+      --ffmpeg-loglevel=
       --help
       --hwaccel
       --hwaccel=