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ffmpegconvert.sh

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+#!/bin/bash
+
+input_file="$1"
+output_extension="$2"
+filename=$(basename -- "$input_file")
+filename_noext="${filename%.*}"
+output_file="${filename_noext}.${output_extension}"
+
+lossy=("mp3" "aac" "ogg" "wma")
+lossless=("flac" "alac" "wav" "aiff")
+
+# dont overwrite a file
+if [ -e "$output_file" ]; then
+    kdialog --error "The target file already exists."
+    exit 1
+fi
+
+# init var for ffmpeg stderrrrr
+error_output=""
+
+# warn if lossy to lossless
+input_extension="${filename##*.}"
+if [[ " ${lossy[@]} " =~ " ${input_extension} " ]] && [[ " ${lossless[@]} " =~ " ${output_extension} " ]]; then
+    kdialog --warningyesno "WARNING: Converting from a lossy to a lossless format.\n\nQuality will NOT improve.\n\nCompression artifacts will be present.\n\nThis betrays the point of lossless formats.\n\nPRESERVATIONISTS WILL WEEP.\n\nContinue?"
+    if [ $? -ne 0 ]; then
+        exit 1
+    fi
+fi
+
+# warn if lossless to lossy
+input_extension="${filename##*.}"
+if [[ " ${lossless[@]} " =~ " ${input_extension} " ]] && [[ " ${lossy[@]} " =~ " ${output_extension} " ]]; then
+    kdialog --warningyesno "WARNING: Converting from a lossless to a lossy format.\n\nQuality will NOT be preserved.\n\nCompression artifacts will be PERMANENTLY introduced.\n\nCONVERTING BACK TO LOSSLESS WILL NOT UNDO THIS.\n\nContinue?"
+    if [ $? -ne 0 ]; then
+        exit 1
+    fi
+fi
+
+# ffmpeg cmd changes based on ext
+if [[ " ${lossy[@]} " =~ " ${output_extension} " ]] || [[ " ${lossless[@]} " =~ " ${output_extension} " ]]; then
+    error_output=$(ffmpeg -i "$input_file" -q:a 0 -map a "$output_file" 2>&1)
+else
+    error_output=$(ffmpeg -i "$input_file" "$output_file" 2>&1)
+fi
+
+# check exit statuses
+if [ $? -ne 0 ]; then
+    # y u fail, ffmpeg????
+    if echo "$error_output" | grep -q "Invalid data found when processing input"; then
+        kdialog --error "FFmpeg does not support source file type."
+    else
+        kdialog --error "An unknown error occurred:\n$error_output"
+    fi
+    exit 1
+fi