Update ffmpeg

ffmpeg.md

@@ -28,5 +28,10 @@ done;
 * Exportar legenda PGS 
   * o OCR tem que ser feito em outro canto. O Gemini sugere usar o "Subtitle Edit", eu preferi o site https://pgs-to-srt.com/ (https://github.com/wydengyre/pgs-to-srt)
 ```
-ffmpeg -i input_file.mkv -map 0:3 -c copy output_subtitles.sup
+FILE=input_file.mkv; 
+ffprobe "$FILE" 2>&1 | sed -nr 's/^ +Stream.*([0-9]):([0-9])\(([a-z]{3})\):.*Subtitle.*/\1 \2 \3/p' | 
+while read INPUT SUB LANG; do 
+    SUBFILE="${FILE%.*}".$LANG.sup; 
+    ffmpeg -i "$FILE" -map "$INPUT:$SUB" -c copy "$SUBFILE" </dev/null; 
+done
 ```