[Cherry-pick] Fix path-like object support in FFmpeg dispatcher (#3243, #3248) #3245
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Summary:
In dispatcher mode, FFmpeg backend does not handle file-like object, and C++ implementation raises an issue.
This commit fixes it by normalizing file-like object to string.
Pull Request resolved: #3243
Reviewed By: nateanl
Differential Revision: D44719280
Pulled By: mthrok
fbshipit-source-id: 9dae459e2a5fb4992b4ef53fe4829fe8c35b2edd