Recover from panic while RunSegmentation

[leszko]

What does this pull request do? Explain your changes. (required)

Specific updates (required)

How did you test each of these updates (required)

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 33.71481%. Comparing base (17832e7) to head (8818913).

Files with missing lines	Patch %	Lines
media/rtmp2segment.go	0.00000%	8 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3342         +/-   ##
===================================================
- Coverage   33.72469%   33.71481%   -0.00988%     
===================================================
  Files            141         141                 
  Lines          37391       37399          +8     
===================================================
- Hits           12610       12609          -1     
- Misses         24061       24070          +9     
  Partials         720         720                 

Files with missing lines	Coverage Δ
media/rtmp2segment.go	0.00000% <0.00000%> (ø)

... and 1 file with indirect coverage changes

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Files with missing lines	Coverage Δ
media/rtmp2segment.go	0.00000% <0.00000%> (ø)

... and 1 file with indirect coverage changes