Allow to specify a path for ffmpeg binary

[gdippolito]

🚀 The feature

Hello! Thanks for the project.

It would be nice to be able to specify a different path for the ffmpeg binary that will be loaded by torchcodec. If a different binary is provided we could perhaps avoid some system checks to libavutil to also allow users to use static builds of ffmpeg.

Motivation, pitch

I think this feature will provide the following benefit:

• Allow to use ffmpeg binary that are not in the system path.
• Allow users to quickly validate the performance difference of different ffmpeg versions without uninstall/install differnet versions
• Allow users to use static builds of ffmpeg.

[ahmadsharif1]

There are multiple .so files that libtorchcodec.so needs. avutil, avcodec, etc. are all libraries that libtorchcodec.so needs.

You could probably try LD_PRELOAD= python Githubissues.

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