Create a new virtual IInputFile class

[valnoel]

The current InputFile class would inherit this IInputFile class.

[fcastan]

avTranscoder is a nice wrapper to FFmpeg/LibAv. Please don't transform it into an abstract library trying to wrap the world.

Do you have some use cases for this abstract InputFile?

[valnoel]

Could be useful for unwrapping specific formats unsupported by FFmpeg/LibAv.
Nowadays, this is the case with the "symmetric-sister-class" IOutputFile, which allowed us to plug a commercial library for some specific MXF wrapping process. The core engine still remains FFmpeg/LibAv !

[fabiencastan]

Ok, great!

[cchampet]

To do that, I think we will need to define:

• IFormatContext, interface of FormatContext
• IFrame, interface of Frame
• IInputFile