@@ -2877,9 +2877,13 @@ static int opt_thread_count(const char *opt, const char *arg)

 static void opt_audio_sample_fmt(const char *arg)

 {

-    if (strcmp(arg, "list"))

+    if (strcmp(arg, "list")) {

         audio_sample_fmt = av_get_sample_fmt(arg);

-    else {

+        if (audio_sample_fmt == AV_SAMPLE_FMT_NONE) {

+            av_log(NULL, AV_LOG_ERROR, "Invalid sample format '%s'\n", arg);

+            ffmpeg_exit(1);

+        }

+    } else {

         list_fmts(av_get_sample_fmt_string, AV_SAMPLE_FMT_NB);

         ffmpeg_exit(0);

     }