Set whisper thread count based on the model

bin/transcribe-video

@@ -46,7 +46,14 @@ extract-16bit-wav-from-video "$input_video" "$wav_name"
 if [[ $? == 1 ]]; then exit 1; fi
 
 for model in "$@"; do
-    transcribe-audio "$wav_name" "$output_name_without_ext" "${model}"
+    # Tweak thread count based on model size.
+    thread_count=4
+    if [[ $model == "medium" ]]; then
+        thread_count=8
+    fi
+
+    transcribe-audio "$wav_name" "$output_name_without_ext" "${model}" $thread_count
+
     if [[ $? == 1 ]]; then
         printf "${RED}${BOLD}Saving the audio file \"$wav_name\" in case you want to reuse it for debugging.\n${NORMAL}"
         exit 1