Update mp4_to_wav.sh

[jaehyun-ko]

fixed small error of file path.

[codecov]

Codecov Report

Merging #4605 (d45e7d5) into master (80e0420) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4605   +/-   ##
=======================================
  Coverage   83.06%   83.06%           
=======================================
  Files         508      508           
  Lines       43646    43646           
=======================================
+ Hits        36253    36254    +1     
+ Misses       7393     7392    -1     

Flag	Coverage Δ
test_integration_espnet1	66.36% <ø> (ø)
test_integration_espnet2	49.53% <ø> (ø)
test_python	70.60% <ø> (+<0.01%)	⬆️
test_utils	23.28% <ø> (ø)

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Impacted Files	Coverage Δ
espnet/distributed/pytorch_backend/launch.py	83.90% <0.00%> (+1.14%)	⬆️

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