fix(cli): improve output consistency and verbose diagnostics

Replace the full help page on no-args with a short usage hint to stderr,
reserving the full help for explicit -h/--help invocations.

Print the active codec skip list at startup under --verbose so
unexpected skips can be diagnosed without resorting to DEBUG mode.

Include the resolved ffmpeg command in dry-run --verbose output, which
is useful for preset authors verifying their ffargs expansion.

Fix the only-if-smaller message to follow the "label: value" convention
used throughout the script.

1 files changed, 7 insertions, 2 deletions

diff --git a/transcode.sh b/transcode.sh
index 2866e97..f3b5a4a 100755
--- a/transcode.sh
+++ b/transcode.sh
@@ -399,7 +399,7 @@ load_preset() {
 
 if [[ $# -eq 0 ]]; then
   debug "No parameters were specified"
-  print_help
+  printf "Usage: %s [OPTION] [--] FILE...\nRun '%s --help' for full usage information.\n" "$SCRIPTNAME" "$SCRIPTNAME" >&2
   exit $EXIT_USAGE_ERROR
 fi
 
@@ -579,6 +579,10 @@ if [[ ! "$NICE_VALUE" =~ ^-?[0-9]+$ ]] || ((NICE_VALUE < -20 || NICE_VALUE > 19)
   exit $EXIT_USAGE_ERROR
 fi
 
+if [[ ${#SKIP_CODECS[@]} -gt 0 ]]; then
+  verbose "Skipping files with codecs:" "${!SKIP_CODECS[*]}"
+fi
+
 # Remove temporary output files created during encoding.
 # Registered via trap EXIT so it runs on normal exit and on failures
 # shellcheck disable=SC2329
@@ -729,6 +733,7 @@ encode_one() {
     verbose "Input codec:" "$input_codec"
     verbose "Input pixel format:" "$input_pixel_format"
     verbose "Output pixel format:" "$output_pixel_format"
+    verbose "Command:" "${cmd[*]}"
     return $EXIT_OK
   fi
 
@@ -743,7 +748,7 @@ encode_one() {
 
     # If requested, keep the original if the new file is larger.
     if [[ $ONLY_IF_SMALLER -eq 1 && $new_filesize -gt $original_filesize ]]; then
-      msg "Did not replace $file as it was larger than the original."
+      msg "Did not replace (new file is larger):" "$file"
       rm -f -- "$tmp"
       return $EXIT_OK
     fi