 int8_t frame_len;
 const int8_t MIN_FRAME_LEN = -1; // Each frame lasts 0.5x normal time (25ms shorter)
 const int8_t MAX_FRAME_LEN = 4;  // Each frame lasts 3x normal time (100ms longer)
+
+const int SKIP_SECONDS = 60;
+const int FPS = 20;
+const int32_t SKIP_BYTES = int32_t(sizeof(frame)) * FPS * SKIP_SECONDS;
 
 //------------------------------------------------------------------------------
 // File system object.

       || ops.reduce_speed
       || ops.increase_speed
       || ops.toggle_pause
       || ops.toggle_negative
       || ops.reset_settings
       || ops.toggle_frame_len)

  if (ops.reduce_speed)        Serial.print(F("\nreduce_speed"));
  if (ops.increase_speed)      Serial.print(F("\nincrease_speed"));
  if (ops.toggle_pause)        Serial.print(F("\ntoggle_pause"));
  if (ops.skip_forward)        Serial.print(F("\nskip_forward"));
  if (ops.toggle_negative)     Serial.print(F("\ntoggle_negative"));
  if (ops.reset_settings)      Serial.print(F("\nreset_settings"));
  if (ops.toggle_frame_len)    Serial.print(F("\ntoggle_frame_len"));
